HP EliteBook 850 G4 Maintenance And Service Manual page 8

5 Removal and replacement procedures for Customer Self-Repair parts ............................................................. 34
Component replacement procedures .................................................................................................................. 34
6 Removal and replacement procedures for Authorized Service Provider parts ................................................... 53
Component replacement procedures .................................................................................................................. 53
7 Interpreting system validation diagnostic front panel LEDs and audible codes ................................................. 80
8 Troubleshooting guide ................................................................................................................................. 82
Resources ............................................................................................................................................................. 83
General troubleshooting steps ............................................................................................................................ 83
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Bottom cover ..................................................................................................................................... 34
Battery ............................................................................................................................................... 38
Hard drive .......................................................................................................................................... 39
Solid-state drive (SSD) ...................................................................................................................... 41
Memory modules ............................................................................................................................... 43
WLAN/Bluetooth combo card ............................................................................................................ 45
WWAN module ................................................................................................................................... 47
RTC battery ........................................................................................................................................ 49
Keyboard ........................................................................................................................................... 50
Internal base plate ............................................................................................................................ 53
Heat sink/fan assembly .................................................................................................................... 55
Fingerprint reader assembly ............................................................................................................. 58
Touchpad board ................................................................................................................................. 59
NFC module ....................................................................................................................................... 61
Smart card reader board ................................................................................................................... 62
USB/audio board ................................................................................................................................ 64
System board .................................................................................................................................... 65
Speaker assembly ............................................................................................................................. 69
Display assembly ............................................................................................................................... 70
Power button board .......................................................................................................................... 77
Top cover ........................................................................................................................................... 79
Identify the issue ............................................................................................................................... 84
1. Understand the issue .................................................................................................. 84
Boot up sequence ......................................................................................... 84
Failure classification ..................................................................................... 84
2. Examine the environment .......................................................................................... 86
3. Perform a visual inspection of hardware ................................................................... 87
4. Update BIOS and drivers ............................................................................................. 87
Manually updating BIOS and drivers ............................................................ 87