HP Pavilion dv4200 Maintenance And Service Manual page 167

2. Remove the 2 Phillips PM2.0×4.0 screws 1 that secure the
modem board to the system board.
3. Lift the right side of the modem board 2 to disconnect
the modem board from the system board.
4. Disconnect the modem cable 3 from the modem board.
5. Remove the modem board.
Removing the Modem Board
Reverse the above procedure to install the modem board.
Maintenance and Service Guide
Removal and Replacement Procedures
5–61