HP Compaq NX4820 Maintenance And Service Manual page 144

14. Release the ZIF connector 1 to which the keyboard cable is
connected and disconnect the keyboard cable 2 from the
system board.
Disconnecting the Keyboard Cable, HP Compaq nx4820 and
Compaq Presario V2400 Models Only
15. Remove the keyboard.
Reverse the above procedure to install the keyboard.
Maintenance and Service Guide
Removal and Replacement Procedures
5–31