HP 255 G4, Maintenance And Service Manual

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6. Remove the bottom cover (see Bottom cover on page 35 ).
7. Remove the hard drive (see Hard drive on page 38 ).
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 40 )
●
Memory module (see Memory module on page 42 )
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
2. Remove the six Phillips PM2.5×2.5 screws (1) that secure the system board to the computer.
52 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts