6 Troubleshooting guide ................................................................................................................................. 77
Resources ............................................................................................................................................................. 78
General troubleshooting steps ............................................................................................................................ 78
vi
Bottom cover ..................................................................................................................................... 33
Battery ............................................................................................................................................... 35
Solid-state drive (M.2) ....................................................................................................................... 37
Optane memory module ................................................................................................................... 39
Memory module ................................................................................................................................ 40
WWAN modules ................................................................................................................................. 44
WLAN/Bluetooth combo card ............................................................................................................ 46
Hard drive connector ......................................................................................................................... 48
Fingerprint reader board ................................................................................................................... 49
TouchPad ........................................................................................................................................... 50
NFC module ....................................................................................................................................... 52
Bottom speakers ............................................................................................................................... 53
Card reader/audio board ................................................................................................................... 55
Thermal module ................................................................................................................................ 56
System board .................................................................................................................................... 59
RTC battery ........................................................................................................................................ 63
Power button board .......................................................................................................................... 64
Top speaker ....................................................................................................................................... 66
Display assembly ............................................................................................................................... 67
Top cover/keyboard ........................................................................................................................... 76
Identify the issue ............................................................................................................................... 79
1. Understand the issue .................................................................................................. 79
Boot up sequence ......................................................................................... 79
Failure classification ..................................................................................... 79
Analyze the issue ............................................................................................................................... 82