Touchpad board
Description Spare part number
HP EliteBook 850 G4 Notebook PC models
Touchpad board without NFC antenna 836620-001
Touchpad board with NFC antenna 837851-001
HP ZBook 15u G4 Mobile Workstation models
Touchpad board without NFC antenna 821153-001
Touchpad board with NFC antenna 821154-001
Before removing the touchpad 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 34).
5. Remove the battery (see Battery on page 38).
6. Remove the keyboard (see Keyboard on page 50).
7. Remove the internal base plate (see Internal base plate on page 53
Remove the touchpad 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 (if installed) (2).
2. Lift the tape (3), and then remove the 2 Phillips M2.5x2.5 screws (4) that secure the touchpad button
board to the computer.
Component replacement procedures 59
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