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Lenovo IdeaPad Yoga 370 Laptop Hardware Maintenance Manual PDF

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Summary of Content for Lenovo IdeaPad Yoga 370 Laptop Hardware Maintenance Manual PDF

Yoga 370 Hardware Maintenance Manual

Note: Before using this information and the product it supports, be sure to read the general information under Appendix A Notices on page 93.

Third Edition (June 2017)

Copyright Lenovo 2017.

LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration GSA contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.

Contents

About this manual. . . . . . . . . . . iii

Chapter 1. Safety information. . . . . . 1 General safety . . . . . . . . . . . . . . . . 1 Electrical safety . . . . . . . . . . . . . . . 1 Safety inspection guide . . . . . . . . . . . . 2 Handling devices that are sensitive to electrostatic discharge. . . . . . . . . . . . . . . . . . 3 Grounding requirements . . . . . . . . . . . . 4 Safety notices (multilingual translations) . . . . . . 4

Chapter 2. Important service information . . . . . . . . . . . . . . 19 Strategy for replacing FRUs . . . . . . . . . 19

Strategy for replacing a storage drive . . . . 19 Important notice for replacing a system board . . . . . . . . . . . . . . . . 20 How to use error message . . . . . . . . 20

Strategy for replacing FRUs for CTO, special bid model, and standard models . . . . . . . . . 20

Product definition. . . . . . . . . . . . 20 FRU identification. . . . . . . . . . . . 20

Chapter 3. General checkout . . . . . 23 What to do first . . . . . . . . . . . . . . 23 Checkout guide . . . . . . . . . . . . . . 24

Lenovo Companion . . . . . . . . . . . 24 Quick test programs. . . . . . . . . . . 24 UEFI diagnostic program . . . . . . . . . 25 Bootable diagnostic programs. . . . . . . 25

Power system checkout . . . . . . . . . . . 26 Checking the ac power adapter . . . . . . 26 Checking the built-in battery and operational charging . . . . . . . . . . . . . . . 26 Checking the coin-cell battery . . . . . . . 27

Chapter 4. Related service information . . . . . . . . . . . . . . 29 Recovery information . . . . . . . . . . . . 29

Resetting your computer . . . . . . . . . 29 Using advanced startup options . . . . . . 29 Recovering your operating system if Windows 10 fails to start . . . . . . . . . . . . . 29 Creating and using a recovery USB drive . . 30

Passwords . . . . . . . . . . . . . . . . 31 Power-on password . . . . . . . . . . . 31 Hard disk password . . . . . . . . . . . 31 Supervisor password . . . . . . . . . . 31

How to remove the power-on password . . . 32 How to remove the hard disk password . . . 32

Power management . . . . . . . . . . . . 33 Sleep mode . . . . . . . . . . . . . . 33 Hibernation mode . . . . . . . . . . . 33

Symptom-to-FRU index . . . . . . . . . . . 34 Numeric error codes . . . . . . . . . . 34 Error messages . . . . . . . . . . . . 35 Beep errors . . . . . . . . . . . . . . 36 No-beep symptoms . . . . . . . . . . . 37 LCD-related symptoms . . . . . . . . . 37 Intermittent problems . . . . . . . . . . 38 Undetermined problems . . . . . . . . . 38

Chapter 5. Function keys . . . . . . . 39

Chapter 6. Locations . . . . . . . . . 41 Locating computer controls, connectors, and indicators. . . . . . . . . . . . . . . . . 41

Front view. . . . . . . . . . . . . . . 41 Rear view . . . . . . . . . . . . . . . 42 Status indicators . . . . . . . . . . . . 42

Locating FRUs and CRUs . . . . . . . . . . 45 Major FRUs . . . . . . . . . . . . . . 46 LCD FRUs . . . . . . . . . . . . . . 48 Miscellaneous parts . . . . . . . . . . . 49 Connector and cable guide . . . . . . . . 49

Looking up FRU information . . . . . . . . . 52

Chapter 7. FRU replacement notices . . . . . . . . . . . . . . . . 53 Screw notices . . . . . . . . . . . . . . . 53 Retaining serial numbers. . . . . . . . . . . 54

Restoring the serial number of the system unit . . . . . . . . . . . . . . . . . 54 Retaining the UUID . . . . . . . . . . . 55

Chapter 8. Removing or replacing a FRU . . . . . . . . . . . . . . . . . . 57 General guidelines . . . . . . . . . . . . . 57 Before servicing the computer . . . . . . . . 58

Disabling the built-in battery . . . . . . . 58 1010 ThinkPad Pen Pro or dummy cap . . . . . 58 1020 Micro-SIM-card tray (available on some models) . . . . . . . . . . . . . . . . . 59 1030 Base cover assembly . . . . . . . . . . 59 1040 Battery . . . . . . . . . . . . . . . 60 1050 Hall sensor card . . . . . . . . . . . . 61

Copyright Lenovo 2017 i

1060 Memory module (for computer models with a replaceable memory module) . . . . . . . . . 62 1070 M.2 SSD . . . . . . . . . . . . . . . 63 1080 Coin-cell battery . . . . . . . . . . . . 64 1090 Wireless-LAN card . . . . . . . . . . . 65 1100 Wireless-WAN card (available on some models) . . . . . . . . . . . . . . . . . 65 1110 Audio card . . . . . . . . . . . . . . 66 1120 Pen holder . . . . . . . . . . . . . . 67 1130 Power button card and power-button-card cable . . . . . . . . . . . . . . . . . . 68 1140 Thermal fan assembly . . . . . . . . . 69 1150 Speaker assembly . . . . . . . . . . . 71 1160 Smart-card reader, smart-card-reader cable, or dummy smart-card door . . . . . . . . . . 71 1170 Fingerprint-reader cable and fingerprint-reader bracket (available on some models) . . . . . . . . . . . . . . . 72 1180 NFC card, NFC cable, and NFC antenna . . 73

1190 Trackpad and trackpad cable. . . . . . . 74 1200 System board . . . . . . . . . . . . . 76 1210 LCD unit . . . . . . . . . . . . . . . 78 1220 Keyboard assembly . . . . . . . . . . 80 2010 Strip bezel . . . . . . . . . . . . . . 81 2020 LCD panel assembly . . . . . . . . . . 82 2030 Camera/microphone card (available on some models) . . . . . . . . . . . . . . . . . 83 2040 Sensor card . . . . . . . . . . . . . 84 2050 LCD hinges. . . . . . . . . . . . . . 85 2060 LCD cable and LED cable assembly . . . . 86 2070 Wireless-LAN antenna kit, wireless-WAN antenna kit, or WiGig antenna kit . . . . . . . 87

Appendix A. Notices. . . . . . . . . . 93 Electronic emissions notices . . . . . . . . . 94 Trademarks . . . . . . . . . . . . . . . . 94

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About this manual

This manual contains service and reference information for the following ThinkPad products:

ThinkPad Yoga 370 Machine types (MT) 20JH, 20JJ, 20JK, and 20JL

Use this manual along with the advanced diagnostic tests to troubleshoot problems.

Important: This manual is intended only for trained service technicians who are familiar with ThinkPad products. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 Safety information on page 1 and Chapter 2 Important service information on page 19.

Copyright Lenovo 2017 iii

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Chapter 1. Safety information

This chapter presents following safety information that you need to be familiar with before you service a ThinkPad notebook computer. General safety on page 1 Electrical safety on page 1 Safety inspection guide on page 2 Handling devices that are sensitive to electrostatic discharge on page 3 Grounding requirements on page 4 Safety notices (multilingual translations) on page 4

General safety Follow these rules to ensure general safety: Observe good housekeeping in the area of the machines during and after maintenance. When lifting any heavy object:

1. Make sure that you can stand safely without slipping.

2. Distribute the weight of the object equally between your feet.

3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.

4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the muscles in your back. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or that you think is too heavy for you.

Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe. Before you start the machine, make sure that other service technicians and the customer's personnel are

not in a hazardous position. Place removed covers and other parts in a safe place, away from all personnel, while you are servicing

the machine. Keep your toolcase away from walk areas so that other people will not trip over it. Do not wear loose clothing that can be trapped in the moving parts of a machine. Make sure that your

sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it. Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, about 8

centimeters (3 inches) from the end. Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.

Attention: Metal objects are good electrical conductors. Wear safety glasses when you are hammering, drilling, soldering, cutting wire, attaching springs, using

solvents, or working in any other conditions that might be hazardous to your eyes. After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device

that is worn or defective. Reinstall all covers correctly before returning the machine to the customer. Fan louvers on the machine help to prevent overheating of internal components. Do not obstruct fan

louvers or cover them with labels or stickers.

Electrical safety Observe the following rules when working on electrical equipment.

Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents.Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock.

Copyright Lenovo 2017 1

Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the switch or unplug the power cord quickly.

Do not work alone under hazardous conditions or near equipment that has hazardous voltages. Disconnect all power before:

Performing a mechanical inspection Working near power supplies Removing or installing main units

Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer to power-off the wall box that supplies power to the machine, and to lock the wall box in the off position.

If you need to work on a machine that has exposed electrical circuits, observe the following precautions: Ensure that another person, familiar with the power-off controls, is near you.

Attention: Another person must be there to switch off the power, if necessary. Use only one hand when working with powered-on electrical equipment; keep the other hand in your

pocket or behind your back.

Attention: An electrical shock can occur only when there is a complete circuit. By observing the above rule, you may prevent a current from passing through your body.

When using testers, set the controls correctly and use the approved probe leads and accessories for that tester.

Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames.

Observe the special safety precautions when you work with very high voltages; Instructions for these precautions are in the safety sections of maintenance information. Use extreme care when measuring high voltages.

Regularly inspect and maintain your electrical hand tools for safe operational condition. Do not use worn or broken tools and testers. Never assume that power has been disconnected from a circuit. First, check that it has been powered off. Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,

ungrounded power extension cables, power surges, and missing safety grounds. Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is

conductive; such touching can cause personal injury and machine damage. Do not service the following parts with the power on when they are removed from their normal operating

places in a machine: Power supply units Pumps Blowers and fans Motor generators Parts similar to those listed above This practice ensures correct grounding of the units.

If an electrical accident occurs: Use caution; do not become a victim yourself. Switch off power. Send another person to get medical aid.

Safety inspection guide The purpose of this inspection guide is to assist you in identifying potentially unsafe conditions. As each machine was designed and built, required safety items were installed to protect users and service technicians from injury. This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non-ThinkPad features or options not covered by this inspection guide.

If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem.

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Consider these conditions and the safety hazards they present: Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal

electrical shock) Explosive hazards, such as a damaged CRT face or a bulging capacitor Mechanical hazards, such as loose or missing hardware

To determine whether there are any potentially unsafe conditions, use the following checklist at the beginning of every service task. Begin the checks with the power off, and the power cord disconnected.

Checklist:

1. Check exterior covers for damage (loose, broken, or sharp edges).

2. Power off the computer. Disconnect the power cord.

3. Check the power cord for:

a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground continuity for 0.1 ohm or less between the external ground pin and the frame ground.

b. The power cord should be the authorized type specified for your computer. Go to: http://www.lenovo.com/serviceparts-lookup

c. Insulation must not be frayed or worn.

4. Check for cracked or bulging batteries.

5. Remove the cover.

6. Check for any obvious non-ThinkPad alterations. Use good judgment as to the safety of any non-ThinkPad alterations.

7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage.

8. Check for worn, frayed, or pinched cables.

9. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with.

Handling devices that are sensitive to electrostatic discharge Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects. Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the person handling the part are all at the same charge.

Notes:

1. Use product-specific ESD procedures when they exceed the requirements noted here.

2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.

When handling ESD-sensitive parts: Keep the parts in protective packages until they are inserted into the product. Avoid contact with other people. Wear a grounded wrist strap against your skin to eliminate static on your body. Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even

when you are wearing a wrist strap. Use a grounded work mat to provide a static-free work surface. The mat is especially useful when

handling ESD-sensitive devices. Select a grounding system, such as those listed below, to provide protection that meets the specific

service requirement.

Note: The use of a grounding system to guard against ESD damage is desirable but not necessary. Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.

Chapter 1. Safety information 3

When working on a double-insulated or battery-operated system, use an ESD common ground or reference point. You can use coax or connector-outside shells on these systems.

Use the round ground prong of the ac plug on ac-operated computers.

Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician.

Safety notices (multilingual translations) The safety notices in this section are provided in the following languages: English Arabic Brazilian Portuguese French German Hebrew Japanese Korean Spanish Traditional Chinese

DANGER

DANGER

DANGER

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DANGER

DANGER

DANGER

DANGER

DANGER

Chapter 1. Safety information 5

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PERIGO

PERIGO

PERIGO

PERIGO

Chapter 1. Safety information 7

PERIGO

PERIGO

PERIGO

PERIGO

DANGER

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DANGER

DANGER

DANGER

DANGER

DANGER

DANGER

Chapter 1. Safety information 9

DANGER

VORSICHT

VORSICHT

VORSICHT

VORSICHT

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VORSICHT

VORSICHT

VORSICHT

VORSICHT

Chapter 1. Safety information 11

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Chapter 1. Safety information 13

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Chapter 1. Safety information 15

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Chapter 1. Safety information 17

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Chapter 2. Important service information

This chapter introduces following important service information that applies to all machine types supported by this manual: Strategy for replacing FRUs on page 19

Strategy for replacing a storage drive on page 19 Important notice for replacing a system board on page 20 How to use error message on page 20

Strategy for replacing FRUs for CTO, special bid model, and standard models on page 20 Product definition on page 20 FRU identification on page 20

Important: Advise customers to contact the Lenovo Customer Support Center if they need any assistance in

obtaining or installing any software fixes, drivers, and UEFI BIOS downloads. Telephone numbers for Lenovo Support are available at: http://www.lenovo.com/support/phone

System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo-authorized service technicians are available in the following support site: http://www.lenovoservicetraining.com/ion/

Strategy for replacing FRUs Before replacing parts:

Ensure that all software fixes, drivers, and UEFI BIOS downloads are installed before replacing any FRUs listed in this manual.

After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before completing the service action.

To download software fixes, drivers, and UEFI BIOS, go to http://www.lenovo.com/ThinkPadDrivers and follow the instructions on the screen.

Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs: If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall the

original FRU before you continue. Some computers have both a processor board and a system board. If you are instructed to replace either

the processor board or the system board, and replacing one of them does not correct the problem, reinstall that board, and then replace the other one.

If an adapter or a device consists of more than one FRU, any of the FRUs may be the cause of the error. Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change. Replace only the FRU that changed the symptoms.

Strategy for replacing a storage drive Always try to run a low-level format before replacing a storage drive. This will cause all customer data on the drive to be lost. Be sure that the customer has a current backup of the data before doing this task.

Attention: The drive startup sequence in the computer you are servicing may have been changed. Be extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect drive, data or programs can be overwritten.

Copyright Lenovo 2017 19

Important notice for replacing a system board Some components mounted on a system board are very sensitive. Improper handling of a system board can cause damage to those components, and may cause a system malfunction.

Attention: When handling a system board: Do not drop a system board or apply any excessive force to it. Avoid rough handling of any kind. Avoid bending a system board and hard pushing to prevent cracking at each BGA (Ball Grid Array) chipset.

How to use error message Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed, begin the diagnosis with the first error code. Whatever causes the first error code may also cause false error codes. If no error code is displayed, see whether the error symptom is listed in the Symptom-to-FRU Index for the computer you are servicing.

Strategy for replacing FRUs for CTO, special bid model, and standard models This topic provides information about the model types and FRU identification.

Product definition This topic introduces different model types and how to identify each type.

Dynamic Configure To Order (CTO)

This model provides the ability for a customer to configure a Lenovo solution from a web site, and have this configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and eSupport will load these products as the 4-character MT, 4-character model and 2-character country code. The model is CTO1 and the default country code is WW (example: 20AACTO1WW).

Special bid model

This model is a unique configuration that has been negotiated between Lenovo and the customer. A unique MTM consists of a 4-character MT, a 4-character model, and a numeric 2-character country code is provided to the customer to place orders (example: 20AA000955). The country code assigned is numeric and does not designate a specific country or region. The custom model factsheet for the MTM indicates which country the special bid MTM is set up for. Special bid offering is not generally announced.

Standard model

Standard models (fixed configuration) are announced and offered to all customers. The MTM portion of the machine label consists of a 4-character MT, a 4-character model, and an alphabetic 2-character country code. The country code assigned is alphabetic and represents a designated country or region (example: 20AA0009UK).

FRU identification Use Lenovo eSupport to identify major FRUs, FRU part numbers, and FRU descriptions for a product at an MT - serial number level. Examples of major FRUs are hard disk drive, system board, and liquid crystal display (LCD).

To identify the major FRUs for a product, do the following:

1. Go to http://support.lenovo.com/ibasepartslookup.

2. Type the Machine Type and Serial Number in the corresponding fields.

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3. Click Submit.

eSupport also can be used to view the general FRU list for a product. The FRU list is a general list of components and does not contain specific model information.

To get the general FRU list for a product, do the following:

1. Go to http://www.lenovo.com/support.

2. Follow the instructions on the screen to select a product.

3. Click the Product & Parts tab.

4. Select System Service Parts to view a general FRU list.

Chapter 2. Important service information 21

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Chapter 3. General checkout

This chapter introduces following information: What to do first on page 23 Checkout guide on page 24

Lenovo Companion on page 24 Quick test programs on page 24 UEFI diagnostic program on page 25 Bootable diagnostic programs on page 25

Power system checkout on page 26

Before you go to the checkout guide, be sure to read the following important notes.

Important notes: Only certified trained personnel should service the computer. Before replacing any FRU, read the entire page on removing and replacing FRUs. When you replace FRUs, it is recommended use new nylon-coated screws. Be extremely careful during such write operations as copying, saving, or formatting. The sequence

of the drives in the computer that you are servicing might have been altered. If you select an incorrect drive, data or programs might be overwritten.

Replace a FRU only with another FRU of the correct model. When you replace a FRU, ensure that the model of the machine and the FRU part number are correct by referring to the web site: http://www.lenovo.com/serviceparts-lookup

A FRU should not be replaced because of a single, unreproducible failure. Single failures can occur for a variety of reasons that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. Consider replacing a FRU only when a problem recurs. If you suspect that a FRU is defective, clear the error log and run the test again. If the error does not recur, do not replace the FRU.

Be careful not to replace a nondefective FRU.

What to do first When you return a FRU, you must include the following information in the parts exchange form or parts return form that you attach to it:

1. Name and phone number of service technician

2. Date of service

3. Date on which the machine failed

4. Date of purchase

5. Failure symptoms, error codes appearing on the display, and beep symptoms

6. Procedure index and page number in which the failing FRU was detected

7. Failing FRU name and part number

8. Machine type, model number, and serial number

9. Customer's name and address

Note: During the warranty period, the customer may be responsible for repair costs if the computer damage was caused by misuse, accident, modification, unsuitable physical or operating environment, or improper maintenance by the customer.Following is a list of some common items that are not covered under warranty and some symptoms that might indicate that the system was subjected to stress beyond normal use.

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Before checking problems with the computer, determine whether the damage is covered under the warranty by referring to the following list:

The following are not covered under warranty: LCD panel cracked from the application of excessive force or from being dropped Scratched (cosmetic) parts Distortion, deformation, or discoloration of the cosmetic parts Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force Damage caused by liquid spilled into the system Damage caused by the improper insertion of a PC card or the installation of an incompatible card Improper disc insertion or use of an optical drive Fuses blown by attachment of a nonsupported device Forgotten computer password (making the computer unusable) Sticky keys caused by spilling a liquid onto the keyboard Use of an incorrect ac power adapter on the computer

The following symptoms might indicate damage caused by nonwarranted activities: Missing parts might be a symptom of unauthorized service or modification. Check for obvious damage to a hard disk drive. If the spindle of a hard disk drive becomes noisy, the hard

disk drive might have been dropped or subject to excessive force.

Checkout guide Use the following procedures as a guide in identifying and correcting problems with the ThinkPad notebook computers.

Note: The diagnostic tests are intended to test only ThinkPad products. The use of non-ThinkPad products, prototype cards, or modified options can lead to false indications of errors and invalid system responses.

1. Identify the failing symptoms in as much detail as possible.

2. Verify the symptoms. Try to re-create the failure by running the diagnostic test or by repeating the operation.

Lenovo Companion Lenovo Companion supports the hardware scan function. It combines diagnostic tests, system information collection, security status, and support information, along with hints and tips for optimal system performance.

The Lenovo Companion program is available for download at https://shop.lenovo.com/us/en/accessories/software/apps/lenovo-apps/companion/.

To run the Lenovo Companion program, open the Start menu and click Lenovo Companion, and then follow the instructions on the screen.

Quick test programs Lenovo provides quick test programs to troubleshoot and resolve computer problems.

To download and install a quick test program, go to http://www.lenovo.com/diags and follow the instructions on the Web site.

To run a test using a quick test program, do the following:

1. Go to the C:\SWTOOLS\ldiag directory.

2. Double-click the lsc_lite.exe file.

3. When the User Account Control window opens, if any, click Yes.

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4. Select the device class to be tested.

5. Select the devices to be tested.

6. Select the test to be performed.

7. Follow the instructions on the screen to start the test. When a problem is detected, information messages are displayed. Refer to the messages to troubleshoot the problem.

UEFI diagnostic program A UEFI diagnostic program is preinstalled on the computer. It enables you to test internal storage devices, view system information, and check and recover bad sectors on internal storage devices.

To run the UEFI diagnostic program, do the following:

1. Turn on the computer. If the computer cannot be turned on, go to Power system checkout on page 26, and check the power sources. If an error code is displayed, go to Symptom-to-FRU index on page 34 for error code descriptions and troubleshooting hints.

2. When the logo screen is displayed, repeatedly press and release the F10 key. The main screen of the UEFI diagnostic program is displayed.

3. Follow the instructions on the screen to use the diagnostic program.

Bootable diagnostic programs If the computer you are servicing is not installed with the UEFI diagnostic program, you can download a bootable diagnostic program from the Lenovo Support Web site. The bootable diagnostic program enables you to view system information and test some hardware devices in your computer, such as memory, storage devices, the LCD, and system board buses. To use the bootable diagnostic program, you can create a bootable diagnostic medium using a USB device or disc.

To create a bootable diagnostic medium, do the following:

1. Go to http://www.lenovo.com/diags.

2. Click Lenovo Bootable Diagnostics.

3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device or disc.

To use the diagnostic medium you have created, do the following:

If you have created the bootable diagnostic medium using a USB device, do the following:

1. Attach the USB device to the computer.

2. Turn on the computer. If the computer cannot be turned on, go to Power system checkout on page 26, and check the power sources. If an error code is displayed, go to Symptom-to-FRU index on page 34 for error code descriptions and troubleshooting hints.

3. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key.

4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program launches.

5. Follow the instructions on the screen to use the diagnostic program.

If you have created the bootable diagnostic medium using a disc, do the following:

1. Turn on the computer. If the computer cannot be turned on, go to Power system checkout on page 26, and check the power sources. If an error code is displayed, go to Symptom-to-FRU index on page 34 for error code descriptions and troubleshooting hints.

2. Insert the disc into the optical drive.

3. Restart the computer.

Chapter 3. General checkout 25

4. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key.

5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program launches.

6. Follow the instructions on the screen to use the diagnostic program.

Power system checkout To verify a power symptom, do the following: 1. Turn off the computer. 2. Connect the ac power adapter. 3. Turn on the computer. If the computer can be turned on, it means that either the battery or the ac

power adapter is functional. 4. Insert a straightened paper clip into the emergency-reset hole to reset the computer. If the computer is

still powered on, it means that the ac power adapter is functional. 5. Turn off the computer. 6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it

means that the battery is functional.

If you suspect a power problem, see the appropriate one of the following power supply checkouts: Checking the ac power adapter on page 26 Checking the built-in battery and operational charging on page 26 Checking the coin-cell battery on page 27

Checking the ac power adapter Ensure that you use the ac power adapter that is shipped with the computer to provide enough power to the computer.

Note: Noise from the ac power adapter does not always indicate a defect.

To check the ac power adapter, do the following:

1. Connect the computer to a power outlet and turn on the computer.

2. Open the Lenovo Settings program and click Power to check the adapter status

If the ac power adapter is working well, adapter information will be displayed on the screen. If a message is displayed warning that the power supply is not enough, replace the adapter with a proper one that is supported by the computer. If you do not see any information about the adapter, replace the adapter with a new one.

If the ac power adapter is working but the computer does not charge during operation, go to Checking the battery and operational charging on page .

Checking the built-in battery and operational charging This computer supports only batteries specially designed for this specific system and manufactured by Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries designed for other systems. If an unauthorized battery or a battery designed for another systems is installed, the system will not charge.

Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use.

Move your pointer to the battery-status icon in the Windows notification area to check the battery status. The battery-status icon displays the percentage of battery power remaining and how long you can use your computer before you must charge the battery.

26 Yoga 370 Hardware Maintenance Manual

To check whether the battery charges properly during operation, do the following:

1. Discharge the battery until the remained battery power is less than 50%.

2. Connect the computer to ac power to charge the battery. If the battery status icon in the Windows notification area indicates that the battery is not charging, remove the battery and let it return to room temperature.

3. Reinstall the battery. If the battery is still not charging, replace the battery.

4. Check the battery status icon again. If the same error still exists, replace the system board.

Checking the coin-cell battery To check the coin-cell battery, do the following:

1. Disable the built-in battery. See Disabling the built-in battery on page 58.

2. Remove the coin-cell battery. See 1080 Coin-cell battery on page 64.

3. Measure the voltage of the coin-cell battery. See the following illustration.

Wire Voltage (V dc)

Red +2.5 to +3.2

Black Ground

If the voltage is correct, replace the system board. If the voltage is not correct, replace the coin-cell battery. If the coin-cell battery discharges quickly after replacement, replace the system board.

Chapter 3. General checkout 27

28 Yoga 370 Hardware Maintenance Manual

Chapter 4. Related service information

This chapter presents following information: Recovery information on page 29 Passwords on page 31 Power management on page 33 Symptom-to-FRU index on page 34

Service Web site: When the latest maintenance diskette and the system program service diskette become available, they will be posted on http://www.lenovo.com/support

Recovery information This chapter provides information about the Windows recovery solutions on the Windows 10 operating system.

Resetting your computer If your computer does not perform well, you might consider resetting your computer. In the resetting process, you can choose to keep your files or remove them, and then reinstall the Windows operating system.

To reset your computer, do the following:

Note: The items in the graphical user interface (GUI) might change without notice.

1. Open the Start menu, and then click Settings Update & security Recovery. 2. In the Reset this PC section, click Get started.

3. Follow the instructions on the screen to reset your computer.

Using advanced startup options The advanced startup options enable you to do the following:

Change the firmware settings of the computer

Change the startup settings of the Windows operating system

Start the computer from an external device

Restore the Windows operating system from a system image

To use advanced startup options, do the following:

Note: The items in the graphical user interface (GUI) might change without notice.

1. Open the Start menu, and then click Settings Update & security Recovery. 2. In the Advanced startup section, click Restart now Troubleshoot Advanced options. 3. Select a startup option you want, and then follow the instructions on the screen.

Recovering your operating system if Windows 10 fails to start The Windows recovery environment on your computer operates independently from the Windows 10 operating system. It enables you to recover or repair the operating system even if the Windows 10 operating system fails to start.

Copyright Lenovo 2017 29

After two consecutive failed boot attempts, the Windows recovery environment starts automatically. Then you can choose repair and recovery options by following the on-screen instructions.

Note: Ensure that your computer is connected to ac power during the recovery process.

Creating and using a recovery USB drive You can create a recovery USB drive as a backup for the Windows recovery programs. With the recovery USB drive, you can troubleshoot and fix the problems even if the preinstalled Windows recovery programs are damaged.

It is recommended that you create a recovery USB drive as early as possible. If you did not create a recovery USB drive as a precautionary measure, you can contact Lenovo Customer Support Center and purchase one from Lenovo. For a list of the Lenovo Support phone numbers for your country or region, go to:

http://www.lenovo.com/support/phone

Creating a recovery USB drive

To create a recovery USB drive, you need a USB drive with at least 16 GB of storage capacity. The actual USB capacity that is required depends on the size of the recovery image.

Attention: The creation process will delete anything stored on the USB drive. To avoid data loss, make a backup copy of all the data that you want to keep.

To create a recovery USB drive, do the following:

Note: Ensure that your computer is connected to ac power during the following process.

1. Connect a proper USB drive (at least 16 GB of storage) to the computer.

2. Type recovery in the search box on the taskbar. Then click Create a recovery drive.

3. Click Yes in the User Account Control window to allow the Recovery Media Creator program to start.

4. In the Recovery Drive window, follow the instructions on the screen to create a recovery USB drive.

Using the recovery USB drive

If you cannot start your computer, reset the computer by inserting a straightened paper clip into the emergency-reset hole. If you still cannot start your computer, use the recovery USB drive to recover your computer.

To use a recovery USB drive, do the following:

Note: Ensure that your computer is connected to ac power during the following process.

1. Connect the recovery USB drive to the computer.

2. Turn on or restart the computer. Before the Windows operating system starts, repeatedly press F12. The Boot Menu window opens.

3. Select the recovery USB drive as the boot device.

4. Select a preferred keyboard layout.

5. Click Troubleshoot to display optional recovery solutions.

6. Select a corresponding recovery solution according to your situation. Then follow the instructions on the screen to complete the process.

30 Yoga 370 Hardware Maintenance Manual

Passwords As many as three passwords may be needed for any ThinkPad notebook computer: the power-on password, the hard disk password, and the supervisor password.

If any of these passwords has been set, a prompt for it will be displayed on the screen whenever the computer is turned on. The computer does not start until the password is entered.

Note: If only a supervisor password is set, the password prompt will not be displayed when the operating system is started.

Power-on password A power-on password protects the system from being powered on by an unauthorized person. The password must be entered before an operating system can be started. For instructions on how to remove the power-on password, see How to remove the power-on password on page 32.

Hard disk password There are two kinds of hard disk passwords: User hard disk password - for the user Master hard disk password - for the system administrator, who can use it to get access to the hard disk

even if the user has changed the user hard disk password

Note: There are two modes for the hard disk password: User only and Master + User. The Master + User mode requires two hard disk passwords; the system administrator enters both in the same operation. The system administrator then provides the user hard disk password to the system user.

Attention: If the user hard disk password has been forgotten, check whether a master hard disk password has been set. If it has, it can be used for access to the hard disk drive. If no master hard disk password is available, neither Lenovo nor Lenovo-authorized service technicians provide any services to reset either the user or the master hard disk password, or to recover data from the hard disk drive. The hard disk drive can be replaced for a scheduled fee.

For how to remove the hard disk password, see How to remove the hard disk password on page 32.

Supervisor password The supervisor password protects the system information stored in the ThinkPad Setup program. It provides the following security features:

If only a supervisor password is set, a password prompt is displayed when you try to start the ThinkPad Setup program. Unauthorized users cannot change most of the system configuration options in the ThinkPad Setup program without the password.

The system administrator can use the supervisor password to access a computer even if the user of that computer has set a power-on password. The supervisor password overrides the power-on password.

The system administrator can set the same supervisor password on many ThinkPad notebook computers to make administration easier.

Attention: If the supervisor password has been forgotten and cannot be made available to the service technician, there is no service procedure to reset the password. The system board must be replaced for a scheduled fee.

Chapter 4. Related service information 31

How to remove the power-on password To remove a power-on password, do the following:

If no supervisor password has been set, do the following to remove the power-on password:

1. Turn off the computer.

2. Remove the battery. For instructions on how to remove the battery, see 1040 Battery on page 60.

3. Remove the coin-cell battery. For instructions on how to remove the coin-cell battery, see 1080 Coin-cell battery on page 64. Wait for a few seconds.

4. Reinstall the coin-cell battery.

5. Reinstall the battery. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does not appear. The power-on password has been removed.

If a supervisor password has been set and is known to the service technician, do the following to remove the power-on password:

1. Turn on the computer.

2. When the logo screen comes up, immediately press F1.

3. Type the supervisor password to enter the ThinkPad Setup program.

4. Select Security.

5. Select Password.

6. Select Power-On Password.

7. Type the current supervisor password in the Enter Current Password field. Then leave the Enter New Password field blank, and press Enter twice.

8. In the Changes have been saved window, press Enter.

9. Press F10 to save changes and exit the ThinkPad Setup program.

How to remove the hard disk password Attention: If User only mode is selected and the user hard disk password has been forgotten and cannot be made available to the service technician, neither Lenovo nor Lenovo-authorized service technicians provide any services to reset the user hard disk passwords or to recover data from the hard disk drive. To put the system back to operational status, the only Lenovo and Lenovo-authorized service solution would be to replace the storage drive with a scheduled fee.

To remove a user hard disk password that has been forgotten, when the supervisor password and master hard disk password are known, do the following:

1. Turn on the computer.

2. When the logo screen comes up, immediately press F1 to enter the ThinkPad Setup program.

3. Select Security.

4. Select Password.

5. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.

6. Select Master hard disk password.

7. Type the current master hard disk password in the Enter Current Password field. Then leave the Enter New Password field blank, and press Enter twice.

8. Press F10.

9. Press F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the master hard disk password have been removed.

32 Yoga 370 Hardware Maintenance Manual

Power management

Sleep mode When the computer enters sleep mode, the following events occur in addition to what occurs in screen blank mode: The LCD is powered off. The storage drive is powered off. The microprocessor stops.

To put your computer into sleep mode, do the following:

For Windows 7: Open the Start menu, then click the arrow next to the Shut down button. Click Sleep from the menu displayed.

For Windows 10: Open the Start menu, click Power, and then click Sleep.

In certain circumstances, the computer goes into sleep mode automatically:

After a period of inactivity specified in power plan settings

When the battery power is low

To cause the computer to return from sleep mode and resume operation, do one of the following: Press the Fn key. Press the power button.

Also, in either of the following events, the computer automatically returns from sleep mode and resumes operation:

The ring indicator (RI) is signaled by a serial device or a PC Card device.

The time set on the resume timer elapses.

Note: The computer does not accept any input immediately after it enters sleep mode. Wait a few seconds before taking any action to reenter operation mode.

Hibernation mode In hibernation mode, the following occurs:

The system status, RAM, VRAM, and setup data are stored on the storage drive.

The system is powered off.

Note: If the computer enters the hibernation mode while it is docked to the docking station or the port replicator, do not undock it before resuming normal operation. If you do undock it and then try to resume normal operation, you will get an error message, and you will have to restart the system.

If you have defined one of the following actions as the event that causes the system to go into hibernation mode, perform that action. Closing the lid. Pressing the power button.

Also, the computer goes into hibernation mode automatically after a period of inactivity specified in power plan settings.

Chapter 4. Related service information 33

When the power is turned on, the computer returns from hibernation mode and resumes operation. The hibernation file in the boot record on the storage drive is read, and system status is restored from the storage drive.

Symptom-to-FRU index This section contains following information: Numeric error codes on page 34 Error messages on page 35 Beep errors on page 36 No-beep symptoms on page 37 LCD-related symptoms on page 37 Intermittent problems on page 38 Undetermined problems on page 38

The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most likely cause is listed first, in boldface type.

Note: Do the FRU replacement or other actions in the sequence shown in the column headed FRU or action, in sequence. If replacing a FRU does not solve the problem, put the original part back in the computer. Do not replace a nondefective FRU.

This index can also help you determine, during regular servicing, what FRUs are likely to need to be replaced next.

A numeric error is displayed for each error detected in POST or system operation. In the displays, n can be any number.

If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not described there, go to Intermittent problems on page 38.

Note: For a device not supported by diagnostic codes in the ThinkPad notebook computers, see the manual for that device.

Numeric error codes Table 1. Numeric error codes

Symptom or error FRU or action, in sequence

0177 Bad SVP data, stop POST task Checksum of the supervisor password in the EEPROM is not correct.

Replace the system board.

0183 Bad CRC of Security Settings in EFI Variable. Enter the ThinkPad Setup program. The checksum of the Security settings in the EFI Variable is not correct.

1. Run the ThinkPad Setup program. The settings will be corrected automatically. Then save the current settings by pressing F10.

2. Replace the system board.

0187 EAIA data access error

Replace the system board.

0188 Invalid RFID Serialization Information Area.

Replace the system board.

0189 Invalid RFID Configuration Information Area.

Replace the system board.

0190 Critical low-battery error

1. Charge the battery pack. 2. Replace the battery pack.

34 Yoga 370 Hardware Maintenance Manual

Table 1. Numeric error codes (continued)

Symptom or error FRU or action, in sequence

0191 System SecurityInvalid Remote Change requested.

1. Run the ThinkPad Setup program, and then save current setting by pressing F10.

2. Replace the system board.

0199 System Security Security password retry count exceeded.

1. Run the ThinkPad Setup program. The retry count will be reset. Then save the current settings by pressing F10.

2. Replace the system board.

0271 Check Date and Time settings.

1. Run ThinkPad Setup to reset the time and date 2. Replace the coin-cell battery and run ThinkPad Setup

to reset the time and date.

1802 Unauthorized network card is plugged inPower off and remove the network card.

1. Remove network card. 2. Replace the system board.

1820 More than one external fingerprint readers are attached.

Turn off the computer. Remove all the external fingerprint readers except the one that you have configured in the operating system.

2100 Detection error on storage device (Main SATA HDD)

1. Reseat the storage device. 2. Replace the storage device.

2101 Detection error on storage device (Main NVMe HDD)

1. Reseat the storage device. 2. Replace the storage device.

2102 Detection error on storage device (M.2 SATA SSD)

1. Reseat the storage device. 2. Replace the storage device.

2103 Detection error on storage device (Optane)

1. Reseat the storage device. 2. Replace the storage device.

2110 Read error on HDD0 (Main HDD)

1. Reseat the storage device. 2. Replace the storage device.

2111 Read error on SSD1 (M.2)

1. Reseat the M.2 solid-state drive (SSD). 2. Replace the M.2 solid-state drive.

2112 Read error on SSD2 (M.2)

1. Reseat the M.2 SSD. 2. Replace the M.2 SSD.

2200 Machine Type and Serial Number are invalid.

Replace the system board.

2201 Machine UUID is invalid

Replace the system board.

Error messages Table 2. Error messages

Symptom or error FRU or action, in sequence

Fan error. 1. Replace the fan. 2. Apply thermal grease. 3. Replace the system board.

Thermal sensing error. Replace the system board.

This system does not support batteries that are not genuine Lenovo-made or authorized. The system will continue to boot, but may not charge unauthorized batteries.

Replace the battery.

Chapter 4. Related service information 35

Table 2. Error messages (continued)

Symptom or error FRU or action, in sequence

Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use.

Beep errors Lenovo SmartBeep technology enables you to decode beep errors with your smartphone when a black screen occurs with beeps from your computer. To decode the beep error with Lenovo SmartBeep technology, do the following:

1. Go to https://support.lenovo.com/smartbeep or scan the following QR Code.

2. Download the proper diagnostic app and install it on your smartphone.

3. Run the diagnostic app and place the smartphone near the computer.

4. Press the Fn key on your computer to emit the beep again. The diagnostic app decodes the beep error and shows possible solutions on the smartphone.

The following section describes some beep errors and the corresponding solutions.

Note: Do not attempt to service a product yourself unless instructed to do so by the Customer Support Center or product documentation. Only use a Lenovo-authorized service provider to repair your product.

Error codes Solutions

0001: Reset error (platform reset not de-asserted) 1. Remove all power resources (the ac power adapter, removable battery, and coin-cell battery). If your computer has a built-in battery, reset the computer by inserting a straightened paper clip into the emergency-reset hole. Wait for one minute. Then reconnect all power resources.

2. Replace the system board (service provider only).

0002: Internal bus error Replace the system board (service provider only).

0281: General embedded controller error Replace the system board (service provider only).

0282: Memory module error 1. Reinstall or replace the memory module.

2. Replace the system board (service provider only).

0283: PCI resource error 1. Remove PCIe devices (the M.2 card, PCIe card, and so on) (service provider only).

2. Replace the system board (service provider only).

0284: TCG-compliant functionality-related error (might be the BIOS code validation failure)

Replace the system board (service provider only).

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Error codes Solutions

0285: TCG-compliant functionality-related error (might be the TPM initialization failure)

Replace the system board (service provider only).

0286: Integrated graphics error Replace the system board (service provider only).

0287: Discrete graphics error 1. Reinstall or replace the discrete graphics card (service provider only).

2. Replace the system board (service provider only).

0288: Computer display error 1. Reconnect the display cable on both the system board side and the computer display side (service provider only).

2. Replace the system board (service provider only).

No-beep symptoms Table 3. No-beep symptoms

Symptom or error FRU or action, in sequence

No beep, power-on indicator on, LCD blank, and no POST.

1. Ensure that every connector is connected tightly and correctly.

2. Replace the system board.

No beep, power-on indicator on, and LCD blank during POST.

1. Replace the system board.

The power-on password prompt appears. A power-on password or a supervisor password is set. Type the password and press Enter.

The hard-disk password prompt appears. A hard disk password is set. Type the password and press Enter.

LCD-related symptoms Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns.If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.

Notes:

This policy applies to all ThinkPad notebook computers purchased on 1 January, 2008 or later.

Lenovo will not provide warranty replacement if the LCD is within specifications because we cannot guarantee that any replacement LCD will have zero pixel defects.

One pixel consists of R, G, B sub-pixels.

Table 4. LCD-related symptoms

Symptom or error FRU or action, in sequence

No beep, power-on indicator on, and a blank LCD during POST.

Replace the system board.

LCD backlight not working. LCD too dark. LCD brightness cannot be adjusted. LCD contrast cannot be adjusted.

1. Reseat the LCD connectors. 2. Replace the LCD assembly. 3. Replace the system board.

Chapter 4. Related service information 37

Table 4. LCD-related symptoms (continued)

Symptom or error FRU or action, in sequence

LCD screen unreadable. Characters missing pixels. Screen abnormal. Wrong color displayed.

1. See important note for LCD-related symptoms. 2. Reseat all LCD connectors. 3. Replace the LCD assembly. 4. Replace the system board.

Horizontal or vertical lines displayed on LCD. Replace the LCD assembly.

Intermittent problems Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a problem recurs.

When analyzing an intermittent problem, do the following:

1. Run the diagnostic test for the system board in loop mode at least 10 times.

2. If no error is detected, do not replace any FRUs.

3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no more errors exist.

Undetermined problems If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed, or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate FRUs that have no defects).

Verify that all attached devices are supported by the computer.

Verify that the power supply being used at the time of the failure is operating correctly. See Power system checkout on page 26. 1. Turn off the computer. 2. Visually check each FRU for damage. Replace any damaged FRU. 3. Remove or disconnect all of the following devices:

a. Non-ThinkPad devices b. Devices attached to the docking station or the port replicator c. Printer, mouse, and other external devices d. Battery e. Storage drive f. External diskette drive or optical drive g. PC cards

4. Turn on the computer. 5. Determine whether the problem has been solved. 6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU):

a. System board b. LCD assembly

38 Yoga 370 Hardware Maintenance Manual

Chapter 5. Function keys

The following list describes the functions of function keys and key combinations.

+ Switch the key function between the standard F1F12 function and the special function printed as an icon on each key. When the Fn Lock indicator is off, you can use the default function. You can change the default function in the Keyboard Properties window.

Mute or unmute the speakers.

If you mute the sound and turn off your computer, the sound will remain muted when you turn on your

computer. To turn on the sound, press or .

Decrease the speaker volume.

Increase the speaker volume.

Mute or unmute the microphones.

Darken the computer display.

Brighten the computer display.

Manage external displays.

Enable or disable the built-in wireless features.

Open the Settings window.

Enable or disable the built-in Bluetooth features.

Open a keyboard setting page.

This key invokes the function defined by yourself. If no function is defined, press this key to open the Cortana personal assistant.

To define or change the action for the F12 key, do the following:

1. Open the Lenovo Settings program.

2. Click the input icon .

3. Locate the KEYBOARD: USER-DEFINED KEY section and follow the instructions on the screen to complete the setting.

On the Input page, you can also define different functions for the key combinations with F12, such as Shift+F12, Alt+F12, or Ctrl+F12.

Fn+B: This key combination has the same function as the Break key on a conventional external keyboard.

Fn+K: This key combination has the same function as the ScrLK or Scroll Lock key on a conventional external keyboard.

Fn+P: This key combination has the same function as the Pause key on a conventional external keyboard.

Fn+S: This key combination has the same function as the SysRq key on a conventional external keyboard.

Fn+4: Press Fn+4 to put the computer into sleep mode. To wake up the computer, press any key or the power button.

Fn+PrtSc: Open the Snipping Tool program.

Copyright Lenovo 2017 39

Fn+Spacebar: If your computer supports keyboard backlight, press Fn+Spacebar to switch between the different keyboard backlight status (off, low, or high).

40 Yoga 370 Hardware Maintenance Manual

Chapter 6. Locations

This chapter introduces the locations of the hardware components on your computer.

Locating computer controls, connectors, and indicators This topic introduces the locations of the computer controls, connectors, and indicators.

Front view

1 Microphones (available on some models) 2 Camera (available on some models)

3 Ambient light sensor 4 Speakers

5 Fingerprint reader (available on some models) 6 Security-lock slot

7 HDMI connector 8 USB 3.0 connector

9 Micro-SIM-card tray (available on some models) 10 MicroSD card slot

Copyright Lenovo 2017 41

11 Audio connector 12 ThinkPad Pen Pro (available on some models)

13 Power button 14 TrackPoint buttons

15 Trackpad 16 NFC label (available on some models)

17 TrackPoint pointing stick 18 Smart-card slot (available on some models)

19 Always On USB connector 20 Mini Ethernet connector

21 USB-C connector (Thunderbolt 3 compatible) 22 Power connector

23 Multi-touch screen

Rear view

1 Fan louvers 2 Keyboard drainage holes

3 Emergency-reset hole

Status indicators This topic helps you locate and identify the various status indicators on your computer.

Note: Depending on the model, your computer might look different from the following illustration.

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1 Caps Lock indicator

When this indicator is on, you can type uppercase letters by directly pressing the letter keys.

2 Fn Lock indicator

This indicator shows the status of Fn Lock function. For more information, see Chapter 5 Function keys on page 39 .

Chapter 6. Locations 43

3 Speaker-mute indicator

When this indicator is on, the speakers are muted.

4 Microphone-mute indicator

When this indicator is on, the microphones are muted.

5 Camera status indicator

When this indicator is on, the camera is in use.

6 7 System status indicators

The indicator in the ThinkPad logo on the computer lid and the indicator in the power button show the system status of your computer.

Blinks for three times: The computer is initially connected to power.

On: The computer is on (in normal mode).

Off: The computer is off or in hibernation mode.

Blinks quickly: The computer is entering sleep or hibernation mode.

Blinks slowly: The computer is in sleep mode.

8 ac power status indicator

This indicator shows the ac power and charging status of the computer.

Green: connected to ac power (battery power 80%100%)

Amber: connected to ac power (battery power 1%80%)

Off: not connected to ac power

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Locating FRUs and CRUs This topic introduces the following service parts: Major FRUs on page 46 LCD FRUs on page 48

Notes: CRU statement for customers:

You can resolve some problems with your product with a replacement part you can install yourself, called a Customer Replaceable Unit or CRU. Installation of self-service CRUs is your responsibility. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at http://www.lenovo.com/support. Click Guides & Manuals and then follow the on-screen instructions to find the manual for your product. You might be required to return the defective part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective CRU within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details.

ThinkPad computers contain the following types of CRUs: Self-service CRUs: Refer to parts that can be installed or replaced easily by customer themselves or by trained

service technicians at an additional cost. Optional-service CRUs: Refer to parts that can be installed or replaced by customers with a greater skill level.

Trained service technicians can also provide service to install or replace the parts under the type of warranty designated for the customers machine.

FRUs: Refer to parts that must be installed or replaced only by trained service technicians. If customers choose to replace the FRUs by themselves, the product warranty might be affected.

Each FRU/CRU is available for all types or models, unless otherwise specified. A Self-service CRU is identified by a single asterisk (*) in the CRU ID column. An Optional-service CRU is identified

by two asterisks (**). An N in the CRU ID column means that the part is not a CRU. FRUs marked with OP are available as options.

Chapter 6. Locations 45

Major FRUs

1

2

3

4

a

5

6

7

8

9

b

d

e

18

15

12

11

10

13

14

16

17

c

19

20

21

22

23

24

25

27 26

28

29

30

31

46 Yoga 370 Hardware Maintenance Manual

Table 5. Major FRUs

No. FRU descriptions CRU ID

1 LCD unit (See LCD FRUs on page 48.) N

2 Keyboard assembly N

3 Keyboard bezel assembly with fingerprint reader card, pen holder, and pen charger N

4 Fingerprint reader card, part of the keyboard bezel assembly N

a Fingerprint-reader bracket N

5 ThinkPad Pen Pro * *

6 Fingerprint-reader cable N

7 Audio card **

8 Power-button-card cable N

9 Audio-card cable N

10 Power button card **

11 Hall sensor card **

12 Hall-sensor-card cable N

13 M.2 SSD *

14 Wireless-LAN card (with or without WiGig function) **

15 Wireless-WAN card* **

16 Built-in battery N

17 Base cover assembly *

b Lenovo factory recovery USB key * N

c Miscellaneous parts (See Miscellaneous parts on page 49.) N

d Power cord *

e ac power adapter *

18 Smart-card-reader cable * N

19 Smart-card reader * N

20 NFC antenna * N

21 NFC card * N

22 NFC cable * N

23 Coin-cell battery *

24 Removable memory module * *

25 System board N

26 dc-in bracket N

27 Thermal fan assembly N

28 Speaker assembly N

29 Trackpad cable N

30 Trackpad N

Chapter 6. Locations 47

Table 5. Major FRUs (continued)

No. FRU descriptions CRU ID

31 Pen holder, part of the keyboard bezel assembly N

* Available on some models

Note: The Lenovo factory recovery USB key 12 is used to restore the Microsoft Windows operating system. They might not come with the computer, and a user might order them from http://www.lenovo.com/lenovorecovery, though additional shipping and handling fees might apply.

LCD FRUs

1

2

3

4

5

6

9

g

f

7

8

12

11

10

48 Yoga 370 Hardware Maintenance Manual

Table 6. LCD FRUs

No. FRU descriptions CRU ID

1 LCD panel assembly N

2 Sensor card N

3 Microphone rubbers N

4 Camera/microphone card * N

5 WiGig antenna kit * N

6 Antenna kit N

7 LED cable assembly N

8 LCD rear-cover assembly N

9 LCD cable N

f Hinge rubbers N

10 LCD hinges N

11 Controller card, part of the LCD panel assembly N

12 Strip bezel N

g screw caps N * Available on some models

Miscellaneous parts Table 7. Miscellaneous parts

FRU descriptions CRU ID

Screw kit N

Label kit N

Connector and cable guide This section provides information for Lenovo authorized service technicians to help identify connectors and cables for replacement purpose. To view each FRU and the exploded illustration of the computer, see Major FRUs on page 46 and LCD FRUs on page 48.

Note: Depending on your model, some connectors or cables might not be available.

Chapter 6. Locations 49

System board

1 2 3 4 5 6 7

8

9

10

11

23

24

26

25

121415161719202122 18 13

Item Connector (location) Internal cable required Cable connection

1 Wireless-LAN card slot (internal)

No Insert the wireless-LAN card into this slot.

2 Wireless-WAN card connector (internal)

No Insert a wireless-WAN card into this slot.

3 Speaker connectors (internal) Speaker assembly with cable

The speaker assembly comes with a cable. Connect the cable to this connector.

4 Thermal fan connector (internal)

Thermal fan assembly with cable

The thermal fan assembly comes with cable. Connect the cable to this connector.

5 M.2 SSD slot (internal) No Insert an M.2 SSD into this slot.

6 LCD connector (internal) LCD cable Connect one end to the LCD panel assembly and the other end to this connector.

7 Camera/LED cable connector (internal)

LED cable assembly Connect one end to the sensor card, one end to the camera card, and the other end to this connector.

8 Power connector (external) No Connect the ac power adapter.

9 USB-C connector (external) No Connect USB-C devices or Thunderbolt 3 devices.

10 Mini Ethernet connector (external)

No Connect the Ethernet extension adapter to this connector.

11 Always On USB 3.0 connectors (external)

No Connect USB-compatible devices.

12 Memory slot (internal) No Insert the memory module into this slot, only available for models with removable memory module

13 NFC connector (internal) NFC cable Connect one end to the NFC card and the other end to this connector.

14 Smart-card-reader connector Smart-card-reader cable Connect one end to the smart-card reader and the other end to this connector.

15 Trackpad connector (internal) Trackpad cable Connect one end to the trackpad assembly and the other end to this connector.

16 Battery connector (internal) Battery with cable The built-in battery comes with a cable. Connect the cable to this connector.

50 Yoga 370 Hardware Maintenance Manual

Item Connector (location) Internal cable required Cable connection

17 TrackPoint connector (internal) Keyboard bezel assembly with cables

The keyboard bezel assembly comes with cables. Connect the TrackPoint cable to this connector.

18 Coin-cell battery connector (internal)

Coin-cell battery with cable

The coin-cell battery comes with a cable. Connect the cable to this connector.

19 Keyboard connector (internal) Keyboard assembly with cables

The keyboard assembly comes with cables. Connect the keyboard cable to this connector.

20 Fingerprint reader connector (internal)

Fingerprint-reader cable Connect one end to the fingerprint reader card and the other end to this connector.

21 Power-button-card connector Power-button-card cable Connect one end to the power button card and the other end to this connector.

22 Pen charger connector Pen charger with cable The pen charger comes with a cable. Connect the cable to this connector.

23 Audio card connector Audio card cable Connect one end to the audio card and the other end to this connector.

24 Micro-SIM-card slot (external) No Insert a micro SIM card into this slot.

24 MicroSD card slot (external) No Insert a MicroSD card into this slot.

25 USB 3.0 connector (external) No Connect USB-compatible devices.

26 HDMI connector (external) No Connect a compatible digital audio device or video monitor to this connector.

Audio card 1 2

Item Connector (location) Internal cable required Cable connection

1 Audio connector (external) No Connect headphones or a headset to this connector.

2 Audio card connector (internal) Audio card cable Connect one end to the system board and the other end to this connector.

Camera/microphone card

1

Item Connector (location) Internal cable required Cable connection

1 Camera/LED cable connector (internal)

LED cable assembly Connect one end to the sensor card, one end to the system board, and the other end to this connector.

Chapter 6. Locations 51

NFC card

1 2

Item Connector (location) Internal cable required Cable connection

1 NFC antenna connector (internal)

NFC antenna Connect the NFC antenna to this connector.

2 NFC connector (internal) NFC cable Connect one end to the system board and the other end to this connector.

Power button card

1

2

Item Connector (location) Internal cable required Cable connection

1 Hall sensor connector (internal)

Hall-sensor-card cable Connect one end to the hall sensor card and the other end to this connector.

2 Power-button-card connector (internal)

Powe-button-card cable Connect one end to the system board and the other end to this connector.

Hall sensor card

1

Item Connector (location) Internal cable required Cable connection

1 Hall sensor connector Hall-sensor-card cable Connect one end to the power button card and the other end to this connector.

Sensor card 1

Item Connector (location) Internal cable required Cable connection

1 Sensor card connector LED cable assembly Connect one end to the camera card, one end to the system board, and the other end to this connector.

Looking up FRU information For detailed FRU information, including part numbers, descriptions, and substitution part numbers, go to: http://www.lenovo.com/serviceparts-lookup

52 Yoga 370 Hardware Maintenance Manual

Chapter 7. FRU replacement notices

This chapter presents notices related to removing and replacing parts. Read this chapter carefully before replacing any FRU.

CRU statement for customers: You can resolve some problems with your product with a replacement part you can install yourself, called a Customer Replaceable Unit or CRU. Some CRUs are designated as self-service CRUs and others are designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional-service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at http://www.lenovo.com/support. Click Guides & Manuals and then follow the on-screen instructions to find the manual for your product. You might be required to return the defective part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective CRU within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details.

Screw notices Loose screws can cause a reliability problem. In the ThinkPad notebook computer, this problem is addressed with special nylon-coated screws that have the following characteristics:

They maintain tight connections.

They do not easily come loose, even with shock or vibration.

They are harder to tighten.

Do the following when you service this machine:

Keep the screw kit in your tool bag. For the part number of the screw kit, go to http://www.lenovo.com/serviceparts-lookup.

It is recommended to use new screws.

It is recommended to use each screw only once.

Tighten screws as follows:

Plastic to plastic Turn an additional 90 degrees after the screw head touches the surface of the plastic part.

90 degrees more

(Cross-section)

Logic card to plastic Turn an additional 180 degrees after the screw head touches the surface of the logic card.

Copyright Lenovo 2017 53

180 degrees more

(Cross-section)

Notes:

Ensure that you use the correct screw. It is recommended to use new screws for replacements. If you have a torque screwdriver, tighten all screws firmly to the torque specified in the screw information table for each step.

Ensure that torque screwdrivers are calibrated correctly following country specifications.

Retaining serial numbers This topic provides instructions on the following: Restoring the serial number of the system unit on page 54 Retaining the UUID on page 55

Restoring the serial number of the system unit When the computer was manufactured, the EEPROM on the system board was loaded with the serial numbers of the system and all major components. These numbers need to remain the same throughout the life of the computer.

If you replace the system board, you must restore the serial number of the system unit to its original value.

The serial number of the system unit is written on the label attached to the bottom of the computer.

If you cannot find the serial number of the system unit on the bottom of the computer, try the following method to get the number:

Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the ThinkPad Setup program is set to UEFI Only.

1. Connect a USB memory key to the computer.

2. Go to http://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a Maintenance Key.

Note: Only an authorized Lenovo service technician can access the above Web site.

3. Restart the computer.

4. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed.

5. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for Asset ID screen is displayed.

6. Type 2 under Enter the action desired, then press Enter. The serial number of each device in your computer is displayed; the serial number of the system unit is listed as follows: 20- Serial number

7. Record the serial number of the system unit.

After you replace the system board, do the following to restore the serial number of the system unit:

1. Connect the Maintenance Key to the computer.

54 Yoga 370 Hardware Maintenance Manual

2. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed.

3. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for Asset ID screen is displayed.

4. Type 1 under Enter the action desired, then press Enter. Then follow the instructions on the screen to restore the serial number of the system unit.

Retaining the UUID The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at production and stored in the EEPROM of your system board.

The algorithm that generates the number is designed to provide unique IDs until the year A.D. 3400. No two computers in the world have the same number.

When you replace the system board, perform the following steps to create a new UUID for the system board if the system board does not have a UUID:

Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the ThinkPad Setup program is set to UEFI Only.

1. Connect a USB memory key to the computer.

2. Go to http://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a Maintenance key.

Note: Only an authorized Lenovo service technician can access the above Web site.

3. Restart the computer.

4. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed.

5. Type 2 under Enter the action desired, then press Enter. The Auto UUID generation utility interface is displayed.

6. Type y under Change UUID. OK? [Y/N], then press Enter. A new UUID is created and written. If a valid UUID already exists, it is not overwritten.

Chapter 7. FRU replacement notices 55

56 Yoga 370 Hardware Maintenance Manual

Chapter 8. Removing or replacing a FRU

This chapter provides instructions on how to remove or replace a FRU.

CRU statement for customers:

You can resolve some problems with your product with a replacement part you can install yourself, called a Customer Replaceable Unit or CRU. Some CRUs are designated as self-service CRUs and others are designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional-service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual is available for downloading at http://www.lenovo.com/support. You might be required to return the defective CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective part within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details.

General guidelines When removing or replacing a FRU, be sure to observe the following general guidelines:

1. Do not try to service any computer unless you have been trained and certified. An untrained person runs the risk of damaging parts.

2. Before replacing any FRU, review Chapter 7 FRU replacement notices on page 53.

3. Begin by removing any FRUs that have to be removed before replacing the failing FRU. Any such FRUs are listed at the beginning of each FRU replacement section. Remove them in the order in which they are listed.

4. Follow the correct sequence in the steps for removing a FRU, as given in the illustrations by the numbers in square callouts.

5. When turning a screw, turn it in the direction as given by the arrow in the illustration.

6. When removing a FRU, move it in the direction as given by the arrow in the illustration.

7. To put the new FRU in place, reverse the removal procedure and follow any notes that pertain to replacement.

8. When replacing a FRU, use the correct screws as shown in the replacement procedures.

DANGER

Before removing any FRU, turn off the computer, unplug all power cords from electrical outlets, disable the built-in battery, and then disconnect any interconnecting cables.

Attention: After replacing a FRU, do not turn on the computer until you have made sure that all screws, springs, and other small parts are in place and none are loose inside the computer. Verify this by shaking the computer gently and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short circuits.

Attention: The system board is sensitive to, and can be damaged by, electrostatic discharge (ESD). Before touching it, establish personal grounding by touching a ground point with one hand or by using an electrostatic discharge strap.

Copyright Lenovo 2017 57

Before servicing the computer Carefully read this topic before servicing the computer.

Disabling the built-in battery Before replacing any FRU/CRU, ensure that you disable Fast Startup first and then disable the built-in battery.

To disable Fast Startup, do the following:

1. From the desktop, type power option in the search box on the taskbar, and select Power Options.

2. Click Choose what the power buttons do on the left pane.

3. Click Change settings that are currently unavailable at the top.

4. If prompted by User Account Control (UAC), click Yes.

5. Clear the Turn on fast startup check box, and then click Save changes.

To disable the built-in battery, do the following:

1. Turn off your computer and disconnect the ac power adapter and all cables from the computer.

2. Turn on your computer. When the logo screen is displayed, immediately press F1 to enter ThinkPad Setup.

3. Select Config Power. The Power submenu is displayed.

4. Select Disable built-in battery and press Enter.

5. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off automatically. Wait three to five minutes to let the computer cool.

1010 ThinkPad Pen Pro or dummy cap

Removal steps of the ThinkPad Pen Pro or dummy cap

Note: Ensure that you reinstall the ThinkPad Pen Pro or dummy cap after finishing the servicing.

58 Yoga 370 Hardware Maintenance Manual

1020 Micro-SIM-card tray (available on some models)

Removal steps of the micro-SIM-card tray

1030 Base cover assembly For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59

Removal steps of the base cover assembly

Loosen the screws 1 and remove the base cover assembly 2 .

Chapter 8. Removing or replacing a FRU 59

Applying labels to the base cover assembly

The following illustration and table show the label areas and what labels are applied in each area.

1

2

3

4

65

1 Genuine Microsoft label 2 Certificate of Authentication (COA) label

3 Serial number label 4 IMEI label

5 System information label and GEO label 6 FCC ID label

1040 Battery For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59

Important notices for replacing a battery

Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use.

A battery FRU should not be replaced unless this diagnostic test shows that the battery is defective. The only exception to this is if the battery is physically damaged or a customer is reporting a possible safety issue.

If the diagnostic program is not installed on the computer, the customer should download and install the program to diagnose the battery, before getting a non-physically damaged battery replaced. Note that the replacement of a physically damaged battery is not covered by the warranty.

Removal steps of the battery

DANGER

Use only the authorized battery specified for your computer. Any other battery could ignite or explode.

60 Yoga 370 Hardware Maintenance Manual

2

3

3

1

Step Screw (quantity) Color Torque

3 M2 3 mm, flat-head, nylon-coated (2) Black 0.181 Nm (1.85 kgf-cm)

4

1050 Hall sensor card For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

Chapter 8. Removing or replacing a FRU 61

Removal steps of the hall sensor card

1

2

3

Step Screw (quantity) Color Torque

2 M2 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm)

1060 Memory module (for computer models with a replaceable memory module) For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

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Removal steps of the memory module

2

11

When installing: Insert the notched end of the memory module into the memory slot. Press the memory module in firmly, and pivot it downward until it snaps into place. Ensure that the memory module is firmly installed in the slot and does not move easily.

1070 M.2 SSD For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

Removal steps of the M.2 SSD

Attention:

Do not drop the drive or apply any physical shock to it. The drive is sensitive to physical shock. Incorrect handling can cause damage and permanent loss of data.

Before removing the drive, have the user make a backup copy of all the information on it if possible.

Never remove the drive while the computer is operating or is in suspend mode.

Ensure that you partition the M.2 SSD after installing it on the computer you are servicing. Otherwise, the M.2 SSD will not function correctly. For instructions on how to partition an M.2 SSD, go to: http://www.lenovo.com/support/msata-fru

Chapter 8. Removing or replacing a FRU 63

Step Screw (quantity) Color Torque

2 M2 2.5 mm, flat-head, nylon-coated (1) Silver 0.181 Nm (1.85 kgf-cm)

1080 Coin-cell battery For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

Removal steps of the coin-cell battery

64 Yoga 370 Hardware Maintenance Manual

When installing: Ensure that the coin-cell battery connector is attached firmly.

1090 Wireless-LAN card For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

Removal steps of the wireless-LAN card

Step Screw (quantity) Color Torque

2 M2 2.5 mm, flat-head, nylon-coated (1) Silver 0.181 Nm (1.85 kgf-cm)

When installing:

Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken.

1. Plug the gray cable into the main connector and the black cable into the auxiliary connector on the card. For wireless-LAN card with WiGig function, also plug the WiGig cable into the 3rd connector on the card.

2. When you route the cables, ensure that there is a gap between the wireless-LAN cables and the hinge, and do not pull the wireless-LAN cables from the hinge.

1100 Wireless-WAN card (available on some models) For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

Chapter 8. Removing or replacing a FRU 65

Removal steps of the wireless-WAN card

Step Screw (quantity) Color Torque

2 M2 2.5 mm, flat-head, nylon-coated (1) Silver 0.181 Nm (1.85 kgf-cm)

When installing: Plug the orange cable into the connector labeled MAIN on the card, and plug the blue cable into the connector labeled AUX on the card.

1110 Audio card For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

66 Yoga 370 Hardware Maintenance Manual

Removal steps of the audio card

1

2

5

4 3

Step Screw (quantity) Color Torque

4 M2 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm)

1120 Pen holder For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 1110 Audio card on page 66

Chapter 8. Removing or replacing a FRU 67

Removal steps of the pen holder

2

1

Step Screw (quantity) Color Torque

2 M2 2 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm)

3

4

1130 Power button card and power-button-card cable For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 1110 Audio card on page 66 1120 Pen holder on page 67

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Removal steps of the power button card and power-button-card cable

1

2

3 4

5

6

Step Screw (quantity) Color Torque

3 M2 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm)

When installing: Ensure that the power card is attached firmly.

1140 Thermal fan assembly For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

Chapter 8. Removing or replacing a FRU 69

Removal steps of the thermal fan assembly

Note: Loosen the screws 3 in ascending alphabetical order ( a to d ) as shown.

1

2

3a 3c

3b

3d

4

When installing:

Always wear fingerstalls when handling the thermal fan assembly. Do not touch or hold any part of the thermal fan assembly with bare fingers.

Before you attach the thermal fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the part marked a as shown in the following illustrations. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component.

a

Do not touch the thermal grease.

Do not press, touch, or rotate the fan impeller.

Do not touch the fan inlet hole.

Do not twist or pull the cable of the thermal fan assembly.

Do not apply pressure on the top and base covers of the thermal fan assembly.

70 Yoga 370 Hardware Maintenance Manual

Do not press the heat pipe. Hold both sides of the heat pipe when you take the thermal fan assembly.

Do not shake or drop the thermal fan assembly.

Ensure that the fan connector is attached firmly.

Replace the thermal fan assembly if you observe the following:

The cover of the thermal fan assembly is deformed or damaged.

There is abnormal noise during rotation.

1150 Speaker assembly For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60.

Removal steps of the speaker assembly 2

2

1

1160 Smart-card reader, smart-card-reader cable, or dummy smart-card door For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 1040 Battery on page 60

Chapter 8. Removing or replacing a FRU 71

Removal steps of the smart-card reader and the smart-card-reader cable

4

3

1

2

5

5 5

6 5

Step Screw (quantity) Color Torque

5 M2 2.5 mm, flat-head, nylon-coated (4) Silver 0.181 Nm (1.85 kgf-cm)

Removal steps of the dummy smart-card door

1170 Fingerprint-reader cable and fingerprint-reader bracket (available on some models) For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59

72 Yoga 370 Hardware Maintenance Manual

1030 Base cover assembly on page 59 1040 Battery on page 60 1110 Audio card on page 66 1120 Pen holder on page 67 1130 Power button card and power-button-card cable on page 68

Removal steps of the fingerprint-reader cable and fingerprint-reader bracket

5

3

1

2

4

6

7

Step Screw (quantity) Color Torque

6 M2 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm)

When installing: Ensure that the fingerprint-reader cable is attached firmly.

1180 NFC card, NFC cable, and NFC antenna For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 1040 Battery on page 60

Chapter 8. Removing or replacing a FRU 73

Removal steps of the NFC card, NFC cable, and NFC antenna

1

2

5

3 4

6

8

7

1190 Trackpad and trackpad cable For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 1040 Battery on page 60

74 Yoga 370 Hardware Maintenance Manual

Removal steps of the trackpad and trackpad cable

2

1

3

6

4

5

7

77

7

Chapter 8. Removing or replacing a FRU 75

Step Screw (quantity) Color Torque

7 M2 1.5 mm, flat-head, nylon-coated (4) Silver 0.181 Nm (1.85 kgf-cm)

8

9

1200 System board Important notices for handling the system board

When handling the system board, read the following:

The system board has an accelerometer, which can be broken when several thousands of G-forces are applied.

Note: Dropping a system board from a height of as little as 0.15 m (6 inches) so that it falls flat on a hard bench can subject the accelerometer to as much as 6000 G's of shock.

Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.

Avoid rough handling of any kind.

At every point in the process, be sure not to drop or stack the system board.

If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated conductive material.

For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 1040 Battery on page 60 1060 Memory module (for computer models with a replaceable memory module) on page 62 1070 M.2 SSD on page 63 1080 Coin-cell battery on page 64 1090 Wireless-LAN card on page 65 1100 Wireless-WAN card (available on some models) on page 65

76 Yoga 370 Hardware Maintenance Manual

Attention: The microprocessor a , which is soldered on the system board, is extremely sensitive. When you service the system board, avoid any kind of rough handling.

a

Removal steps of the system board

1

11

10

12

13

14 15

16

17

2

3

4

5 6

7

8

9

18

20

19

19

19

19 19

19

19

19

2020

19

Chapter 8. Removing or replacing a FRU 77

Step Screw (quantity) Color Torque

18 M2.5 4 mm, flat-head, nylon-coated (1) Silver 0.294 Nm (3.0 kgf-cm)

19 M2 3 mm, flat-head, nylon-coated (9) Black 0.181 Nm (1.85 kgf-cm)

20 M2 4.5 mm, flat-head, nylon-coated (3) Silver 0.181 Nm (1.85 kgf-cm)

21

22

When installing: Ensure that all the connectors are attached firmly to the system board.

After the replacement finishes, calibrate the accelerometer using the sensor calibration tool. To download the sensor calibration tool and the instruction, do the following:

Note: Service account and password are required for downloading the sensor calibration tool and the instruction.

1. Go to http://support.lenovo.com/us/en/documents/HT103119 and follow the instructions on the screen.

2. Locate the sensor calibration tool and select the corresponding file name to download the sensor calibration tool or the instruction.

1210 LCD unit For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 1040 Battery on page 60

78 Yoga 370 Hardware Maintenance Manual

1060 Memory module (for computer models with a replaceable memory module) on page 62 1070 M.2 SSD on page 63 1080 Coin-cell battery on page 64 1090 Wireless-LAN card on page 65 1100 Wireless-WAN card (available on some models) on page 65 1200 System board on page 76

Removal steps of the LCD unit 1

1

2

Step Screw (quantity) Color Torque

1 M2.5 3.5 mm, flat-head, nylon-coated (2) Black 0.294 Nm (3.0 kgf-cm)

2 M2.5 4 mm, flat-head, nylon-coated (1) Silver 0.294 Nm (3.0 kgf-cm)

3

Chapter 8. Removing or replacing a FRU 79

4

4

When installing: Ensure that you attach the connectors firmly.

Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken.

1220 Keyboard assembly For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 1040 Battery on page 60 1060 Memory module (for computer models with a replaceable memory module) on page 62 1070 M.2 SSD on page 63 1080 Coin-cell battery on page 64 1090 Wireless-LAN card on page 65 1100 Wireless-WAN card (available on some models) on page 65 1110 Audio card on page 66 1120 Pen holder on page 67 1140 Thermal fan assembly on page 69 1150 Speaker assembly on page 71 1200 System board on page 76 1210 LCD unit on page 78

80 Yoga 370 Hardware Maintenance Manual

Removal steps of the keyboard assembly

1

1

1 1

2 2

2

2

2 2

2 2

2

3

Step Screw (quantity) Color Torque

1 M2 2 mm, flat-head, nylon-coated (4) Black 0.181 Nm (1.85 kgf-cm)

2 M2 2.5 mm, flat-head, nylon-coated (9) Silver 0.181 Nm (1.85 kgf-cm)

2010 Strip bezel

Removal steps of the strip bezel

1

1

Step Screw Cap Screw (quantity) Color Torque

1 M2.5 x 4 mm, flat-head, nylon-coated (2) Silver 0.294 Nm (3.0 kgf-cm)

Chapter 8. Removing or replacing a FRU 81

2

2

2

2

2

2020 LCD panel assembly For access, remove this FRU: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 2010 Strip bezel on page 81

Removal steps of the LCD panel assembly

1 2

3

3

3

3

4

Step Screw (quantity) Color Torque

3 M2 2.5 mm, wafer-head, nylon-coated (4) Silver 0.181 Nm (1.85 kgf-cm)

82 Yoga 370 Hardware Maintenance Manual

5

6

7

8

2030 Camera/microphone card (available on some models) For access, remove this FRU: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 2010 Strip bezel on page 81

Removal steps of the camera/microphone card

1

1

1

1

2

Step Screw (quantity) Color Torque

1 M2 2.5 mm, flat-head, nylon-coated (4) Silver 0.181 Nm (1.85 kgf-cm)

Chapter 8. Removing or replacing a FRU 83

3

4

5

6

7

When installing: Ensure that the connector is attached firmly.

2040 Sensor card For access, remove this FRU: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 2010 Strip bezel on page 81

Removal steps of the sensor card

1

1

1

1

2

84 Yoga 370 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

1 M2 2.5 mm, flat-head, nylon-coated (4) Silver 0.181 Nm (1.85 kgf-cm)

3

74

5

7 6

2050 LCD hinges For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 1210 LCD unit on page 78 2010 Strip bezel on page 81 2020 LCD panel assembly on page 82

Chapter 8. Removing or replacing a FRU 85

Removal steps of the LCD hinges

1

2 2

3

3

2 2

1

Step Screw (quantity) Color Torque

2 M2.5 2 mm, flat-head, nylon-coated (4) Black 0.294 Nm (3.0 kgf-cm)

2060 LCD cable and LED cable assembly For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 1210 LCD unit on page 78 2010 Strip bezel on page 81 2020 LCD panel assembly on page 82

Removal steps of the LCD cable

1

2

86 Yoga 370 Hardware Maintenance Manual

Removal steps of the LED cable assembly

1

72

3

4

2070 Wireless-LAN antenna kit, wireless-WAN antenna kit, or WiGig antenna kit For access, remove these FRUs in order: 1010 ThinkPad Pen Pro or dummy cap on page 58 1020 Micro-SIM-card tray (available on some models) on page 59 1030 Base cover assembly on page 59 Disconnect the battery cable. See 1040 Battery on page 60. 1210 LCD unit on page 78 2010 Strip bezel on page 81 2020 LCD panel assembly on page 82

Chapter 8. Removing or replacing a FRU 87

Removal steps of the wireless-LAN antenna kit

1

1

2

2

22 2

2

2

2

2

2

3

3

Removal steps of the wireless-WAN antenna kit (available on some models)

1

1 1

1

2

2

22 2

2

2

2

2

2

2

88 Yoga 370 Hardware Maintenance Manual

3

3 3

3

Removal steps of the WiGig antenna kit (available on some models)

1

2

2

22

3

Chapter 8. Removing or replacing a FRU 89

When installing:

When you install the antenna kit, route the cables as shown in the following illustrations.

Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken.

For non-WiGig computer models with both wireless-WAN and wireless-LAN:

a

b

c

d

a Wireless-WAN auxiliary antenna (blue) b Wireless-LAN auxiliary antenna (black)

c Wireless-WAN main antenna (orange) d Wireless-LAN main antenna (gray)

For non-WiGig computer models with wireless-LAN:

a

b

a Wireless-LAN auxiliary antenna (black) b Wireless-LAN main antenna (gray)

90 Yoga 370 Hardware Maintenance Manual

For WiGig computer models:

a

b c

a Wireless-LAN auxiliary antenna (black) b Wireless-LAN main antenna (gray)

c WiGig antenna (white)

Chapter 8. Removing or replacing a FRU 91

92 Yoga 370 Hardware Maintenance Manual

Appendix A. Notices

Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult your local Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead. However, it is the users responsibility to evaluate and verify the operation of any other product, program, or service.

Lenovo may have patents or pending patent applications covering subject matter described in this document. The furnishing of this document does not give you any license to these patents. You can send license inquiries, in writing, to:

Lenovo (United States), Inc. 1009 Think Place - Building One Morrisville, NC 27560 U.S.A. Attention: Lenovo Director of Licensing

LENOVO PROVIDES THIS PUBLICATION AS IS WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do not allow disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to you.

This information could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. Lenovo may make improvements and/or changes in the product(s) and/or the program(s) described in this publication at any time without notice.

The products described in this document are not intended for use in implantation or other life support applications where malfunction may result in injury or death to persons. The information contained in this document does not affect or change Lenovo product specifications or warranties. Nothing in this document shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo or third parties. All information contained in this document was obtained in specific environments and is presented as an illustration. The result obtained in other operating environments may vary.

Lenovo may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you.

Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the materials for this Lenovo product, and use of those Web sites is at your own risk.

Any performance data contained herein was determined in a controlled environment. Therefore, the result obtained in other operating environments may vary significantly. Some measurements may have been made on development-level systems and there is no guarantee that these measurements will be the same on generally available systems. Furthermore, some measurements may have been estimated through extrapolation. Actual results may vary. Users of this document should verify the applicable data for their specific environment.

Copyright Lenovo 2017 93

Electronic emissions notices For electronic emission information on Class B digital devices, refer to the corresponding information in the User Guide.

EU contact: Lenovo, Einsteinova 21, 851 01 Bratislava, Slovakia

Trademarks The following terms are trademarks of Lenovo in the United States, other countries or both:

Lenovo Lenovo logo ThinkPad ThinkPad logo TrackPoint Yoga

Intel and Thunderbolt are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries.

Microsoft, Windows, Windows Server, and Cortana are trademarks of the Microsoft group of companies.

DisplayPort is a trademark of the Video Electronics Standards Association.

The terms HDMI and HDMI High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries.

WiGig, Wi-Fi Alliance, and Miracast are registered trademarks of Wi-Fi Alliance.

USB-C is a trademark of USB Implementers Forum.

Other company, product, or service names may be the trademarks or service marks of others.

94 Yoga 370 Hardware Maintenance Manual

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