HP Compaq NX4820 Maintenance And Service Manual page 158

2. Remove the two silver PM2.0×5.0 screws 1 that secure the
USB/S-Video controller board to the top cover.
3. Lift up on the right side of the board 2 to disconnect it from
the system board.
4. Remove the USB/S-Video controller board.
Removing the USB/S-Video Controller Board
Reverse the above procedure to install the USB/S-Video
controller board.
Maintenance and Service Guide
Removal and Replacement Procedures
5–45