HP Pavilion DV4-2155 Maintenance And Service Manual page 94

Removal and replacement procedures
4. Remove the two Phillips PM1.5×9.0 screws 1 and the Phillips PM2.5×3.0 screw 2 that secure the system
board to the computer.
5. Use the optical drive connector 1 to lift the right side of the system board 2 until it rests at an angle.
6. Release the system board 3 by sliding it to the right at an angle until the connectors on the left side of the
system board disengage from the base enclosure, and then remove the system board.
Reverse this procedure to install the system board.
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