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4 Removal and replacement procedures ....................................................................................................... 50
Preliminary replacement requirements ............................................................................................... 50
Tools required .................................................................................................................... 50
Service considerations ....................................................................................................... 50
Plastic parts ....................................................................................................... 50
Cables and connectors ..................................................................................... 51
Drive handling ................................................................................................... 51
Grounding guidelines ......................................................................................................... 52
Electrostatic discharge damage ........................................................................ 52
Packaging and transporting guidelines ............................................. 53
Workstation guidelines ..................................................................... 53
Equipment guidelines ....................................................................... 54
Component replacement procedures ................................................................................................. 55
Battery ............................................................................................................................... 55
Using the optional security screw ...................................................................................... 57
Bottom door ....................................................................................................................... 58
SIM .................................................................................................................................... 59
Optical drive ....................................................................................................................... 60
Hard drive .......................................................................................................................... 62
Memory modules ............................................................................................................... 64
WWAN module .................................................................................................................. 66
WLAN/Bluetooth combo card ............................................................................................ 68
Keyboard ........................................................................................................................... 70
Heat shield ......................................................................................................................... 73
Fan ..................................................................................................................................... 75
Heat sink ............................................................................................................................ 77
Processor ........................................................................................................................... 80
Top cover ........................................................................................................................... 82
Fingerprint reader board .................................................................................................... 89
Speaker assembly ............................................................................................................. 91
Function board/Power button board assembly .................................................................. 93
Audio board ....................................................................................................................... 95
USB connector assembly .................................................................................................. 96
Battery cable ...................................................................................................................... 98
System board ..................................................................................................................... 99
RTC battery ..................................................................................................................... 103
Optical drive extension board (4540s models only) ......................................................... 105
Hard drive extension board (4540s models only) ............................................................ 107
Power cable ..................................................................................................................... 109
Latch assembly ................................................................................................................ 110
Display assembly ............................................................................................................. 112
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