Lenovo AIO A540 Computer Hardware Maintenance Manual PDF

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Summary of Content for Lenovo AIO A540 Computer Hardware Maintenance Manual PDF

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Lenovo A540/A740 Hardware Maintenance Manual

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

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Chapter 7... Replacing hardware ... ... ... ... 21 General information... ... ... ... ... ... ... ... ... ... ... ... ... 21 Replacing the keyboard and mouse ... ... ... ... ... ... 22 Replacing the power cord or power adapter ... ... ... 22 Removing the base cover ... ... ... ... ... ... ... ... ... ... 23 Replacing the hard disk drive ... ... ... ... ... ... ... ... ... 24 Replacing a memory module ... ... ... ... ... ... ... ... ... 26 Replacing the system fan ... ... ... ... ... ... ... ... ... ... 27 Replacing the heat-sink ... ... ... ... ... ... ... ... ... ... ... 28 Replacing the speaker system ... ... ... ... ... ... ... ... 29 Replacing the motherboard... ... ... ... ... ... ... ... ... ... 30 Removing the hinge from the chassis ... ... ... ... ... ... 31 Removing the rear cover ... ... ... ... ... ... ... ... ... ... ... 32 Replacing the Transform board ... ... ... ... ... ... ... ... 35 Replacing the Wi-Fi card... ... ... ... ... ... ... ... ... ... ... 36 Replacing the power switch board ... ... ... ... ... ... ... 37 Replacing the NFC module ... ... ... ... ... ... ... ... ... ... 38 Replacing the camera ... ... ... ... ... ... ... ... ... ... ... ... 39 Replacing the LED panel... ... ... ... ... ... ... ... ... ... ... 40 A540 FRU lists... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 42 A740 FRU lists... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 46

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iv Lenovo A540/A740Hardware Maintenance Manual

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This manual contains service and reference information for Lenovo A540/A740 computers listed on the cover... It is intended only for trained servicers who are familiar with Lenovo computer products...

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CAUTION: Electrical current from power, telephone, and communication cables can be hazardous... To avoid personal injury or equipment damage, disconnect any attached power cords, telecommunication cables, network cables, and modem cables before you open the computer covers, unless instructed otherwise in the installation and configuration procedures...

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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 rubber floor mats near their equipment that contain small conductive fibers to decrease electrostatic discharge...

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Safety inspection guide The intent of this inspection guide is to assist you in identifying potential hazards posed by these products... Each computer, as it was designed and built, had required safety items installed to protect users and service personnel from injury... This guide addresses only those items... However, good judgment should be used to identify potential safety hazards due to attachment of features or options not covered by this inspection guide...

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Disconnect the attached power cords, telecommunications cables, network cables, and modem cables before you open the device covers, unless instructed otherwise in the installation and configuration procedures...

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CAUTION: When replacing the lithium battery, use only Part Number 45C1566 or an equivalent type battery recommended by the manufacturer... If your system has a module containing a lithium battery, replace it only with the same module type made by the same manufacturer... The battery contains lithium and can explode if not properly used, handled, or disposed of... Do not:

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CAUTION: The power control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device... The device also might have more than one power cord... To remove all electrical current from the device, ensure that all power cords are disconnected from the power source...

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This chapter provides general information that applies to all computer models covered by this manual...

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

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The Setup Utility program is used to view and change the configuration settings of your computer, regardless of which operating system you are using... However, the operating system settings might override any similar settings in the Setup Utility program...

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4... Type the new password, then press the Enter key... Re-type the password to confirm the new password... If you typed the new password correctly, the new password will be installed... A Setup Noticed confirming that changes have been saved will be displayed...

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4... Use - and arrows to select a device... Use the <+> or <-> keys to move a device up or down... Use the <> key to exclude the device from or include the device in the boot sequence...

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Exiting the Lenovo BIOS Setup Utility program After you finish viewing or changing settings, press the Esc key to return to the Lenovo BIOS Setup Utility program main menu... You might have to press the Esc key several times... Do one of the following:

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The Symptom-to-FRU index lists error symptoms and possible causes... The most likely cause is listed first... Always begin with Chapter 4, General Checkout, on page 11... This index can also be used to help you decide which FRUs to have available when servicing a computer... If you are unable to correct the problem using this index, go to Undetermined problems on page 20...

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Keyboard error Cannot initialize the keyboard... Make sure the keyboard is properly connected to the computer and that no keys are held pressed during POST... To purposely configure the computer without a keyboard, select Keyboardless operation in Startup and set the option to Enabled... The BIOS then ignores the missing keyboard during POST...

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Attention: Do not remove the computer cover or attempt any repair before reading the Important safety information in the Safety and Warranty Guide that was included with your computer... To obtain copies of the Safety and Warranty Guide, go to the Support Web site at: http://consumersupport... lenovo... com...

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Step 3... Disconnect all cables attached to the computer... This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer... Refer to Left and right view and Rear view for help with locating the various connectors...

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Step 5... Remove the 4 screws that secure the hard disk drive to the motherboard...

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Step 6... Remove the 6 screws that secure the hinge to the chassis 1 , then raise the hinge to remove it from the chassis... 2

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Step 7... Slide the LED panel upward from the bottom (with Lenovo logo) of the panel...

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Step 1... Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices...

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A540 FRU lists This chapter lists the information on the field replaceable units (FRUs) for A540 All-In-One computers...

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DELTA ADP-120ZB BBHT common 120W adapter 36200439 1120W

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802... 11AC_BT4... 0 RTL8821AU-CG 1x1ac+BT4... 0 Combo USB 11202701 N

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Longwell 1... 8M Denmark C13 power cord 31039729 1

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A740 FRU lists This chapter lists the information on the field replaceable units (FRUs) for A540 All-In-One computers...

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Attention: Be sure to read and understand all the safety information before replacing any FRUs...

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802... 11AC_BT4... 0 RTL8821AU-CG 1x1ac+BT4... 0 Combo USB 11202701 N

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DVB-T Avermedia H334 DVB-T Mini TV Card 11201071 NTV tuner

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Liteon SM-8861 Mouse(WW) improved silver 25216250 2

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MECHANICAL MECHANICAL Power Board Bracket ,C,A540 5M20F63298 N

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As this computer has an ACPI BIOS system, the operating system is allowed to control the power management features of the computer and the settings for Advanced Power Management (APM) BIOS mode is ignored... Not all operating systems support ACPI BIOS mode...

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