HP 6720s Maintenance And Service Manual page 68

Remove the two Phillips PM2.0×4.0 screws (4) that secure the TouchPad bracket to the computer.
4.
Release the TouchPad bracket (1) by sliding it back.
5.
Remove the TouchPad bracket (2) by lifting it straight up.
6.
Remove the TouchPad button board (3).
7.
Remove the TouchPad button board cable (4) from the opening in the TouchPad bracket.
8.
60 Chapter 4 Removal and replacement procedures