Lenovo ThinkBook 13x Laptop Hardware Maintenance Manual PDF

Hardware Maintenance Manual

Lenovo ThinkBook 13x

First Edition (June 2021)

Copyright Lenovo 2021.

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. General checkout . . . . . 21 What to do first . . . . . . . . . . . . . . . 21 CRU list . . . . . . . . . . . . . . . . . . 22

Chapter 3. Identifying FRUs (CRUs) . . . . . . . . . . . . . . . . . 23 Locate FRUs and CRUs . . . . . . . . . . . 23

Chapter 4. Removing a FRU or CRU . . . . . . . . . . . . . . . . . . 27 Service tools . . . . . . . . . . . . . . . . 27 General guidelines. . . . . . . . . . . . . . 27 Remove the lower case . . . . . . . . . . . . 28 Remove the battery pack . . . . . . . . . . . 29 Remove the system board mylar . . . . . . . . 30 Remove the solid-state drive (SSD) . . . . . . . 30 Remove the Wi-Fi card mylar . . . . . . . . . 31

Remove the fingerprint board cable . . . . . . . 32 Remove the Type C bracket . . . . . . . . . . 32 Remove the heat sink . . . . . . . . . . . . 33 Remove the golden mylar . . . . . . . . . . . 34 Remove the USB board mylar . . . . . . . . . 34 Remove the USB board cable bracket 1 . . . . . 35 Remove the USB board. . . . . . . . . . . . 35 Remove the fan . . . . . . . . . . . . . . . 37 Remove the speakers . . . . . . . . . . . . 38 Remove the touchpad mylar . . . . . . . . . . 39 Remove the touchpad cable . . . . . . . . . . 39 Remove the touchpad . . . . . . . . . . . . 40 Remove the brackets . . . . . . . . . . . . 42 Remove the system board. . . . . . . . . . . 42

Remove the USB board cable (61 pin) . . . . 45 Remove the USB board cable (62 pin) and the USB board cable bracket 2 . . . . . . . . 45 Use a Golden Key U1 tool to flash-write key id information . . . . . . . . . . . . . . . 46

Remove the pen holder . . . . . . . . . . . . 46 Remove the fingerprint board . . . . . . . . . 47 Remove the LCD module . . . . . . . . . . . 48

LCD Self Test . . . . . . . . . . . . . . 50 Remove the upper case (with keyboard) . . . . . 50

Appendix A. Label locations. . . . . . 53 Trademarks . . . . . . . . . . . . . . . . . lv

Copyright Lenovo 2021 i

ii Hardware Maintenance Manual

About this manual

This manual contains service and reference information for the following Lenovo products.

Machine Machine type (MT)

ThinkBook 13x ITG 20WJ

Important:

This manual is intended only for trained service technicians who are familiar with Lenovo products.

Before servicing a Lenovo product, be sure to read all the information under Chapter 1 Safety information on page 1.

Copyright Lenovo 2021 iii

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Chapter 1. Safety information

This chapter presents the following safety information that you need to be familiar with before you service a Lenovo notebook computer.

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 tool case 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 non-conductive 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. 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

Copyright Lenovo 2021 1

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,

non-grounded 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 Similar units as 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-Lenovo 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.

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 cathode ray tube (CRT) face or a bulging capacitor Mechanical hazards, such as loose or missing hardware

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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-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo

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. 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.

Chapter 1. Safety information 3

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

Chapter 1. Safety information 7

PERIGO

PERIGO

PERIGO

PERIGO

PERIGO

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DANGER

DANGER

DANGER

DANGER

Chapter 1. Safety information 9

DANGER

DANGER

DANGER

DANGER

VORSICHT

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VORSICHT

VORSICHT

VORSICHT

VORSICHT

Chapter 1. Safety information 11

VORSICHT

VORSICHT

VORSICHT

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Chapter 1. Safety information 15

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Chapter 1. Safety information 17

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Chapter 1. Safety information 19

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Chapter 2. General checkout

This chapter contains the following topics:

Before you go to the checkout instructions, ensure that you 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.

Be extremely careful during such write operations as copying, saving, or formatting. Drives in the computer that you are servicing sequence might have been altered. If you select an incorrect drive, data or programs might be overwritten.

Replace an FRU only with another FRU of the correct model. When you replace an FRU, make sure that the model of the machine and the FRU part number are correct by referring to the FRU parts list.

An 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 an FRU only when a problem recurs. If you suspect that an 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 an 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.

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

Copyright Lenovo 2021 21

Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an incompatible card

Improper disc insertion or use of an external optical drive Fuses blown by attachment of a non-supported 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 laptop products

The following symptoms might indicate damage caused by non-warranted 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.

CRU list Table 1. Models: ThinkBook 13x ITG (MT: 20WJ)

CRU Type

ac power adapter self-service

Power cord self-service

Lenovo USB-C 3-in-1 Hub * self-service

ThinkBook Bluetooth Silent Mouse * self-service

* for selected models

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Chapter 3. Identifying FRUs (CRUs)

Locate FRUs and CRUs The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to replace when servicing a customers computer.

Copyright Lenovo 2021 23

Figure 1. ThinkBook 13x ITG exploded view

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Table 2. FRU (CRU) categories

No. FRU (CRU) category

1 LCD module

2 Upper case (with keyboard)

3 Pen holder

4 Fingerprint board

5 Fingerprint board cable

6 USB board cable (62 pin)

7 USB board cable brackets

8 System board

9 Solid-state drive (SSD)

10 Brackets

11 System board mylar

12 Heat sink

13 Golden mylar

14 Wi-Fi card mylar

15 Speakers

16 Battery pack

17 Lower case

18 Fan

19 USB board mylar

20 USB board cable (61 pin)

21 USB board

22 Type C bracket

23 Touchpad mylar

24 Touchpad cable

25 Touchpad

a Power cord

b ac power adapter

c Screw kit

Chapter 3. Identifying FRUs (CRUs) 25

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Chapter 4. Removing a FRU or CRU

Service tools The following table lists tools for servicing Lenovo computers. Tools with a cross mark are needed for serving the product models as described by this publication. Prepare them before you service the product.

Table 3. Service tools

Service tool and consumable Model applicability

Screw driver (Phillips head) (PH1/PH01) X

Screw driver (Torx head) (T5) X

Screw driver (Torx head) (T30)

Pry tool 1 X

Tweezers (conductive) X

Tweezers (isolated)

Suction cup

Hexagonal socket

Silicone grease

Acetate tape X

Polyamide tape

Mylar tape

Electrical tape

Double-sided tape

Conductive tape

Eraser

Heat gun

Brown brush

Notes:

T30 screw drivers are used to service the new Intel Xeon CPUs.

Hexagonal sockets are used to remove antenna connectors.

Silicone grease is applied to the CPU and heatsink surfaces to eliminate air gaps.

General guidelines When removing or replacing an FRU, ensure that you 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. 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 procedure. Remove them in the order in which they are listed.

Copyright Lenovo 2021 27

3. Follow the correct sequence in the steps for removing an FRU, as shown in the illustrations by the numbers in square callouts.

4. When removing an FRU, move it in the direction as shown by the arrow in the illustration.

5. To install a new FRU in place, perform the removal procedure in reverse and follow any notes that pertain to replacement.

6. When replacing an FRU, carefully retain and reuse all screws.

7. When replacing the base cover, reapply all labels that come with the replacement base cover. If some original labels are not included with the replacement base cover, peal them off from the original base cover and paste them on the replacement base cover.

DANGER

Before removing any FRU or CRU, shut down the computer and unplug all power cords from electrical outlets.

Attention: After replacing an FRU, do not turn on the computer until you have ensured 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 ESD. Before touching it, establish personal grounding by touching a ground point with one hand or by using an ESD strap (P/N 6405959).

Remove the lower case Make sure the computer has been shut down before servicing the computer.

Step 1. Place the computer upside down on a flat surface.

Step 2. Remove nine screws.

Figure 2. Remove nine screws

Screw specifications Number of screws

M2.0 x L3.5 9

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Step 3. Pry up the latches and then remove the lower case.

Figure 3. Pry up the latches and remove the lower case

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Lower case

Remove the battery pack Make sure the following FRU (or CRU) has been removed.

Remove the lower case on page 28

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove four screws and then remove the battery pack.

Figure 4. Remove four screws and remove the battery pack

Screw specifications Number of screws

M2.0 x L3.5 4

Chapter 4. Removing a FRU or CRU 29

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Battery pack

Remove the system board mylar Make sure the following FRU (or CRU) has been removed.

Remove the lower case on page 28

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Peel off the system board mylar.

Figure 5. Peel off the system board mylar

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

System board mylar

Remove the solid-state drive (SSD) Make sure the following FRU (or CRU) has been removed.

Remove the lower case on page 28

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove one screw.

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Figure 6. Remove one screw

Screw specifications Number of screws

M1.6 x L1.7 1

Step 3. Remove the SSD by pulling it away from the slot.

Figure 7. Remove the SSD

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Solid-state drive (SSD)

Remove the Wi-Fi card mylar Make sure the following FRU (or CRU) has been removed.

Remove the lower case on page 28

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove the Wi-Fi card mylar.

Chapter 4. Removing a FRU or CRU 31

Figure 8. Remove the Wi-Fi card mylar

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Wi-Fi card mylar

Remove the fingerprint board cable Make sure the following FRU (or CRU) has been removed.

Remove the lower case on page 28

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Detach the fingerprint board cable connectors and then remove the fingerprint board cable.

Figure 9. Remove the fingerprint board cable

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Fingerprint board cable

Remove the Type C bracket Make sure the following FRU (or CRU) has been removed.

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Remove the lower case on page 28

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove two screws and then remove the Type C bracket.

Figure 10. Remove two screws and remove the Type C bracket

Screw specifications Number of screws

M2.0 x L3.5 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Type C bracket

Remove the heat sink Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the system board mylar on page 30

Step 1. Remove four screws and then remove the heat sink.

Figure 11. Remove four screws and remove the heat sink

Chapter 4. Removing a FRU or CRU 33

Screw specifications Number of screws

M2.0 x L3.5 4

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Heat sink

Remove the golden mylar Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the system board mylar on page 30

Remove the heat sink on page 33

Step 1. Peel off the golden mylar.

Figure 12. Peel off the golden mylar

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Golden mylar

Remove the USB board mylar Make sure the following FRU (or CRU) has been removed.

Remove the lower case on page 28

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Peel off the USB board mylar.

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Figure 13. Remove the USB board mylar

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

USB board mylar

Remove the USB board cable bracket 1 Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the USB board mylar on page 34

Step 1. Remove one screw and then remove the USB board cable bracket 1.

Figure 14. Remove the USB board cable bracket 1

Screw specifications Number of screws

M1.6 x L1.7 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

USB board cable bracket

Remove the USB board Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Chapter 4. Removing a FRU or CRU 35

Remove the battery pack on page 29

Remove the system board mylar on page 30

Remove the Type C bracket on page 32

Remove the heat sink on page 33

Remove the USB board mylar on page 34

Remove the fan on page 37

Remove the USB board cable bracket 1 on page 35

Step 1. Detach the speaker cable connector and then peel off the tape.

Figure 15. Detach the speaker cable connector and peel off the tape

Step 2. Disconnect cables connected to the USB board.

Figure 16. Disconnect cables connected to the USB board

Step 3. Remove two screws and then remove the USB board.

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Figure 17. Remove the USB board

Screw specifications Number of screws

M2.0 x L3.5 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

USB board

Remove the fan Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the system board mylar on page 30

Remove the USB board mylar on page 34

Step 1. Detach the fan cable connector and release the fan cable from the cable guide. Remove three screws and then remove the fan.

Figure 18. Remove the fan

Screw specifications Number of screws

M2.0 x L3.5 3

Chapter 4. Removing a FRU or CRU 37

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Fan

Remove the speakers Make sure the following FRUs (CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Step 1. Detach the main and auxiliary antenna cable connectors and release the antenna cables. Peel off the tape.

Figure 19. Detach the main and auxiliary antenna cable connectors and release the antenna cables

Step 2. Detach the speaker cable connector and release the speaker cable and the antenna cables from the cable guide.

Figure 20. Detach the speaker cable connector and release cables

Step 3. Remove four screws and then remove the speakers.

Note: The antenna module is combined with the speakers, not remove the antenna module.

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Figure 21. Remove four screws and remove the speakers

Screw specifications Number of screws

M1.6 x L1.7 4

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Speakers

Remove the touchpad mylar Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Step 1. Peel off the touchpad mylar.

Figure 22. Remove the touchpad mylar

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Touchpad mylar

Remove the touchpad cable Make sure the following FRUs (or CRUs) have been removed.

Chapter 4. Removing a FRU or CRU 39

Remove the lower case on page 28

Remove the battery pack on page 29

Remove the touchpad mylar on page 39

Step 1. Detach one of the antenna cable connectors.

Figure 23. Detach one of the antenna cable connectors

Step 2. Detach the touchpad cable connectors and then remove the touchpad cable.

Figure 24. Remove the touchpad cable

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Touchpad cable

Remove the touchpad Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Remove the touchpad mylar on page 39

Step 1. Disconnect the touchpad cable from the touchpad.

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Figure 25. Disconnect the touchpad cable from the touchpad

Step 2. Remove six screws.

Figure 26. Remove six screws

Screw specifications Number of screws

M1.6 x L1.7 6

Step 3. Remove the touchpad.

Figure 27. Remove the touchpad

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Touchpad

Chapter 4. Removing a FRU or CRU 41

Remove the brackets Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Remove the system board mylar on page 30

Remove the heat sink on page 33

Remove the USB board mylar on page 34

Remove the fan on page 37

Step 1. Remove four screws and then remove the brackets.

Figure 28. Remove four screws and remove the brackets

Screw specifications Number of screws

M2.0 x L3.5 4

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Brackets

Remove the system board Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Remove the system board mylar on page 30

Remove the solid-state drive (SSD) on page 30

Remove the Wi-Fi card mylar on page 31

Remove the fingerprint board cable on page 32

Remove the heat sink on page 33

Remove the golden mylar on page 34

Remove the USB board mylar on page 34

Remove the fan on page 37

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Remove the USB board cable bracket 1 on page 35

Step 1. Remove three screws and then open the hinge.

Figure 29. Remove three screws and open the hinge

Screw specifications Number of screws

M2.0 x L3.5 3

Step 2. Disconnect cables connected to the system board and disconnect the USB cables from the USB board.

Chapter 4. Removing a FRU or CRU 43

Figure 30. Disconnect cables connected to the system board and disconnect the USB cables from the USB board

Step 3. Remove three screws and then remove the system board module. Remove the following FRUs and then remove the system board.

Remove the USB board cable (61 pin) on page 45

Remove the USB board cable (62 pin) and the USB board cable bracket 2 on page 45

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Figure 31. Remove the system board module

Screw specifications Number of screws

M2.0 x L3.5 3

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts:

System board

Remove the USB board cable (61 pin) After removing the system board module, do the following steps:

Step 1. Disconnect the USB board cable from the system board and then remove the USB board cable (61 pin).

Figure 32. Remove the USB board cable (61 pin)

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

USB board cable (61 pin)

Remove the USB board cable (62 pin) and the USB board cable bracket 2 After removing the system board module, do the following steps:

Step 1. Remove one screw and then remove the USB board cable bracket 2.

Chapter 4. Removing a FRU or CRU 45

Figure 33. Remove the USB board cable bracket 2

Screw specifications Number of screws

M1.2 x L1.05 1

Step 2. Detach the USB board cable connector and then remove the USB board cable (62 pin).

Figure 34. Remove the USB board cable (62 pin)

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts:

USB board cable (62 pin)

USB board cable bracket

Use a Golden Key U1 tool to flash-write key id information After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID to the new system board.

The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb drive. Go to http://support.lenovo.com/us/en/solutions/HT506954 for detailed instructions on how to create and use a Golden Key U1 tool.

Remove the pen holder Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Remove the system board mylar on page 30

Remove the solid-state drive (SSD) on page 30

Remove the Wi-Fi card mylar on page 31

Remove the fingerprint board cable on page 32

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Remove the heat sink on page 33

Remove the golden mylar on page 34

Remove the USB board mylar on page 34

Remove the fan on page 37

Remove the USB board cable bracket 1 on page 35

Remove the system board on page 42

Step 1. Remove one screw and then remove the pen holder.

Figure 35. Remove one screw and remove the pen holder

Screw specifications Number of screws

M2.0 x L3.5 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Pen holder

Remove the fingerprint board Make sure the following FRUs (or CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Remove the system board mylar on page 30

Remove the solid-state drive (SSD) on page 30

Remove the Wi-Fi card mylar on page 31

Remove the fingerprint board cable on page 32

Remove the heat sink on page 33

Remove the golden mylar on page 34

Remove the USB board mylar on page 34

Remove the fan on page 37

Remove the USB board cable bracket 1 on page 35

Chapter 4. Removing a FRU or CRU 47

Remove the system board on page 42

Remove the pen holder on page 46

Step 1. Remove one screw and then pry up the fingerprint board holder.

Figure 36. Remove one screw and pry up the fingerprint board holder

Screw specifications Number of screws

M1.6 x L1.7 1

Step 2. Remove the fingerprint board.

Figure 37. Remove the fingerprint board

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Fingerprint board

Remove the LCD module Make sure the following FRUs (CRUs) have been removed.

Remove the lower case on page 28

Remove the system board mylar on page 30

Remove the heat sink on page 33

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Remove the golden mylar on page 34

Remove the USB board mylar on page 34

Step 1. Peel off the tape and then disconnect the EDP cable from the system board.

Figure 38. Peel off the tape and disconnect the EDP cable from the system board

Step 2. Disconnect the cable from the system board and release the cable from the cable guide.

Figure 39. Disconnect the two cables and release the cable from the cable guide

Step 3. Rotate the LCD module to an angle of more than 90 degrees and place the computer on a flat surface as shown. Remove six screws and then remove the LCD module.

Note: The LCD module is an FRU, not disassemble it.

Chapter 4. Removing a FRU or CRU 49

Figure 40. Remove the LCD module

Screw specifications Number of screws

M2.0 x L3.5 6

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

LCD module

LCD Self Test When you turn on the computer and the LCD goes black, run LCD Self Test to help you determine whether the LCD functions normally.

To run LCD Self Test:

Ensure that the computer is connected to ac power. Then, press the power button for about seven seconds to turn off the computer.

Press Fn, left Ctrl, and the power button at the same time. If the computer displays five solid colors in sequence across the entire screen, it indicates that the LCD functions normally.

The test lasts for about 20 seconds and then exits automatically. You also can press the power button to exit the test.

Remove the upper case (with keyboard) Make sure the following FRUs (CRUs) have been removed.

Remove the lower case on page 28

Remove the battery pack on page 29

Remove the solid-state drive (SSD) on page 30

Remove the Wi-Fi card mylar on page 31

Remove the fingerprint board cable on page 32

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Remove the Type C bracket on page 32

Remove the heat sink on page 33

Remove the golden mylar on page 34

Remove the USB board mylar on page 34

Remove the USB board cable bracket 1 on page 35

Remove the USB board on page 35

Remove the fan on page 37

Remove the speakers on page 38

Remove the touchpad mylar on page 39

Remove the touchpad cable on page 39

Remove the touchpad on page 40

Remove the brackets on page 42

Remove the system board on page 42

Remove the pen holder on page 46

Remove the fingerprint board on page 47

Remove the LCD module on page 48

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part:

Upper case (with keyboard)

Chapter 4. Removing a FRU or CRU 51

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Appendix A. Label locations

Labels attached to the base cover are country/region specific. Make sure to apply the appropriate labels to the replacement base cover.

Table 4. All base cover labels

Label Label name Applied country/region Label dimensions

a Print label online 17 mm x 26.1 mm

b GML label 16 mm x 22.5 mm

c Print label online 33 mm x 13.5 mm

d Adapter label 65 mm x 20 mm

e WL/BT label US/CA/TW 32 mm x 10 mm

Israel 32 mm x 10 mm

Argentina 68 mm x 6 mm

South Africa 20 mm x 10 mm

f Country label TW vision warning label 70 mm x 10 mm

g Malaysia label 8 mm x 8 mm

h KCC label (print online) 43 mm x 24 mm

I Vietnam MEPS label 10 mm x 9 mm

j Brazial 16.5 mm x 15 mm

Copyright Lenovo 2021 53

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