Lenovo 81T9, Hardware Maintenance Manual

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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. Create and use a USB
repair shim . . . . . . . . . . . . . . . 23
What is a USB repair shim? . . . . . . . . . . 23
Create a repair shim . . . . . . . . . . . . . 23
Use a USB repair shim to diagnose and fix
problems . . . . . . . . . . . . . . . . . 23
Factory test items . . . . . . . . . . . . 24
Chapter 4. Idetifying FRUs (CRUs) . . 27
Locate FRU and CRU . . . . . . . . . . . . 27
Chapter 5. Removing a FRU or
CRU . . . . . . . . . . . . . . . . . . 31
Service tools . . . . . . . . . . . . . . . . 31
General guidelines. . . . . . . . . . . . . . 31
Remove the lower case . . . . . . . . . . . . 32
Remove the battery pack . . . . . . . . . . . 33
Remove the WLAN card . . . . . . . . . . . 34
Remove the upper case. . . . . . . . . . . . 36
Remove the fan . . . . . . . . . . . . . . . 37
Remove the I/O board with cable . . . . . . . . 38
Remove the heat sink . . . . . . . . . . . . 40
Remove the speakers . . . . . . . . . . . . 41
Remove the system board. . . . . . . . . . . 42
Remove the LCD module . . . . . . . . . . . 44
Remove the camera and sensor board . . . . . . 46
Trademarks . . . . . . . . . . . . . . . . xlix
© Copyright Lenovo 2019
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