HP 640 ProBook G3 Series Maintenance And Service Manual page 73

2. Turn the computer over, and then disconnect the power button board cable (1), the speaker cable (2),
and the fingerprint reader board cable (3).
3. Carefully disconnect the plastic clips (1) on the front edge, and then remove the top cover (1).
Reverse this procedure to install the top cover.
To remove the TouchPad:
1. Disconnect the TouchPad cables (1) and (2).
Component replacement procedures 65