HP Compaq NC4400 Maintenance And Service Manual page 144

Removal and Replacement Procedures
2. Release the ZIF connector to which the infrared board cable
is connected and disconnect the cable 1 from the system
board.
3. Remove the Torx8 T8M2.0×5.0 screw 2 that secures the
infrared board to the system board.
4. Remove the infrared board 3.
Removing the Infrared Board
Reverse the above procedure to install the infrared board .
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