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Plastic parts ....................................................................................................... 36
Cables and connectors ..................................................................................... 37
Drive handling ................................................................................................... 37
Grounding guidelines ......................................................................................................... 38
Electrostatic discharge damage ........................................................................ 38
Packaging and transporting guidelines ............................................. 39
Workstation guidelines ..................................................................... 39
Equipment guidelines ....................................................................... 40
Component replacement procedures ................................................................................................. 41
Service tag ......................................................................................................................... 41
Battery ............................................................................................................................... 42
Using the optional security screw ...................................................................................... 43
Bottom door ....................................................................................................................... 44
SIM .................................................................................................................................... 45
Optical drive ....................................................................................................................... 46
Hard drive .......................................................................................................................... 48
Memory modules ............................................................................................................... 50
WWAN module .................................................................................................................. 52
WLAN/Bluetooth combo card ............................................................................................ 54
Keyboard ........................................................................................................................... 56
Heat shield ......................................................................................................................... 59
Fan ..................................................................................................................................... 61
Heat sink ............................................................................................................................ 63
Processor ........................................................................................................................... 66
Top cover ........................................................................................................................... 67
Fingerprint reader board .................................................................................................... 75
Speaker assembly ............................................................................................................. 76
Function board/Power button board assembly .................................................................. 79
Audio board ....................................................................................................................... 81
USB connector assembly .................................................................................................. 82
Battery cable ...................................................................................................................... 84
System board ..................................................................................................................... 85
RTC battery ....................................................................................................................... 88
Optical drive extension board (4540s models only) ........................................................... 90
Hard drive extension board (4540s models only) .............................................................. 92
Power cable ....................................................................................................................... 94
Latch assembly .................................................................................................................. 95
Display assembly ............................................................................................................... 97
5 Computer Setup (BIOS) and Advanced System Diagnostics ................................................................. 105
Using Computer Setup ..................................................................................................................... 105
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