HP ZBook 15u G3 Mobile Workstation HP EliteBook 850 G3 Notebook PC HP EliteBook 840 G3 Notebook PC - Maintenance and Service Guide

Touchpad button board
Description Spare part number
Touchpad button board for HP EliteBook 848 and HP EliteBook 840 821171-001
Touchpad button board w/NFC antenna (not for HP ZBook 15u) 821172-001
Touchpad button board for HP EliteBook 850 836620-001
Touchpad button board for HP ZBook 15u 821153-001
Touchpad button board w/NFC antenna for HP ZBook 15u 821154-001
Before removing the touchpad button board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o 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 rst unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
4. Remove the bottom cover (see Bottom cover on page 35).
5. Remove the battery (see Battery on page 40).
6. Remove the following components:
a. Keyboard (see Keyboard on page 50)
b. Hard drive (Hard drive on page 41)
c. Internal base plate (Internal base plate on page 56)
Remove the touchpad button board:
1. Disconnect the cable from the touchpad to the smart card reader board (1), and then disconnect the NFC
antenna from the NFC module (2).
2. Lift the tape (3), and then remove the 2 Phillips PM2.5x2.5 screws (4) that secure the touchpad button
board to the top cover.
66 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts