HP EliteBook 820 G4 Maintenance And Service Manual page 8

5 Removal and replacement procedures for Customer Self-Repair parts ............................................................. 30
Component replacement procedures .................................................................................................................. 30
6 Removal and replacement procedures for Authorized Service Provider parts ................................................... 49
Component replacement procedures .................................................................................................................. 49
7 Interpreting system validation diagnostic front panel LEDs and audible codes ................................................. 69
8 Computer Setup (BIOS), TPM, and HP Sure Start ............................................................................................. 71
Using Computer Setup ......................................................................................................................................... 71
TPM BIOS settings (select products only) ........................................................................................................... 74
Using HP Sure Start (select products only) ......................................................................................................... 74
9 Using HP PC Hardware Diagnostics (UEFI) ....................................................................................................... 75
Downloading HP PC Hardware Diagnostics (UEFI) to a USB device .................................................................... 75
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Bottom cover ..................................................................................................................................... 30
Battery ............................................................................................................................................... 35
Hard drive .......................................................................................................................................... 36
Solid-state drive ................................................................................................................................ 38
Memory modules ............................................................................................................................... 40
WLAN/Bluetooth combo card ............................................................................................................ 42
WWAN module ................................................................................................................................... 44
Keyboard ........................................................................................................................................... 46
Display assembly ............................................................................................................................... 50
Heat sink/fan assembly .................................................................................................................... 56
Smart card reader board ................................................................................................................... 58
Touchpad board ................................................................................................................................. 59
NFC module ....................................................................................................................................... 60
System board .................................................................................................................................... 61
RTC battery ........................................................................................................................................ 65
Fingerprint reader assembly ............................................................................................................. 66
Speaker assembly ............................................................................................................................. 67
Top cover ........................................................................................................................................... 68
Starting Computer Setup .................................................................................................................. 71
Navigating and selecting in Computer Setup ................................................................................... 71
Restoring factory settings in Computer Setup ................................................................................. 71
Updating the BIOS ............................................................................................................................. 72
Determining the BIOS version ......................................................................................... 72
Downloading a BIOS update ........................................................................................... 73
Changing the boot order using the f9 prompt .................................................................................. 73