Removal And Replacement Procedures For Authorized Service Provider Parts; Component Replacement Procedures; Internal Base Plate - HP ELITEBOOK 840 G4 Maintenance And Service Manual

6 Removal and replacement procedures for
Authorized Service Provider parts
This chapter provides removal and replacement procedures for Authorized Service Provider only parts.
CAUTION:
Accessing these parts can damage the computer or void the warranty.
CAUTION:
perform the removal and replacement procedures described here. Accessing the internal part could damage
the computer or void the warranty.

Component replacement procedures

NOTE: Details about your computer, including model, serial number, product key, and length of warranty,
are on the service tag at the bottom of your computer. See
NOTE: HP continually improves and changes product parts. For complete and current information on
supported parts for your computer, go to http://partsurfer.hp.com, select your country or region, and then
follow the on-screen instructions.
There are as many as 45 screws that must be removed, replaced, and/or loosened when servicing Authorized
Service Provider only parts. Make special note of each screw size and location during removal and
replacement.

Internal base plate

Description
Internal base plate
Before removing the internal base plate, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
4. Remove the bottom cover (see
5. Remove the battery (see
6. Remove the keyboard (see
7. If equipped, disconnect the antenna cables from the WLAN module (see
on page
8. If equipped, disconnect the antenna cables from the WWAN module (see
50 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
Components described in this chapter should only be accessed by an authorized service provider.
This computer does not have user-replaceable parts. Only HP authorized service providers should
Bottom cover on page
Battery on page
Keyboard on page
42).
Labels on page 17
32).
36).
47).
for details.
Spare part number
821164-001
WLAN/Bluetooth combo card
WWAN module on page 44).