HP Notebook PC (AMD) HP 255 G4 Notebook PC - Maintenance and Service Guide

Before removing the system 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 battery (see Battery on page 30).
5. Remove the optical drive (see Optical drive on page 31), if installed.
6. Remove the bottom cover (see Bottom cover on page 37).
7. Remove the hard drive (see Hard drive on page 40).
NOTE: When replacing the system board, be sure that the following components are removed from the
defective system board and installed on the replacement system board:
●
WLAN module (see WLAN module on page 42)
●
Memory module (see Memory module on page 44)
To remove the system board:
1. Position the computer upright, and then disconnect the following cables from the system board:
(1): USB board cable
(2): Optical drive connector cable
(3): Keyboard cable
(4): Power connector cable
(5): Display cable
(6): Power button board cable
(7): TouchPad button board cable
(8): Speaker cable
56 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts