7 Troubleshooting guide ................................................................................................................................. 82
Resources ............................................................................................................................................................. 83
General troubleshooting steps ............................................................................................................................ 83
viii
Bottom cover ..................................................................................................................................... 35
Battery ............................................................................................................................................... 40
Hard drive .......................................................................................................................................... 41
SSD ..................................................................................................................................................... 43
Memory modules ............................................................................................................................... 44
WLAN/Bluetooth combo card ............................................................................................................ 46
WWAN module ................................................................................................................................... 48
Keyboard ........................................................................................................................................... 50
RTC battery ........................................................................................................................................ 55
Internal base plate ............................................................................................................................ 56
Heat sink/fan assembly .................................................................................................................... 59
Fingerprint reader assembly ............................................................................................................. 62
Power button board .......................................................................................................................... 63
Touchpad button board ..................................................................................................................... 66
NFC module ....................................................................................................................................... 68
Smart card reader board ................................................................................................................... 69
USB/audio board ................................................................................................................................ 71
System board .................................................................................................................................... 72
Speaker assembly ............................................................................................................................. 75
Display assembly ............................................................................................................................... 76
Top cover ........................................................................................................................................... 81
Identify the issue ............................................................................................................................... 84
1. Understand the issue .................................................................................................. 84
Boot up sequence ......................................................................................... 84
Failure classification ..................................................................................... 84
Analyze the issue ............................................................................................................................... 87