HP TC4400 - Manual (Page 105)

5–22 Maintenance and Service Guide
Removal and Replacement Procedures
5. Turn the tablet PC right-side up with the front toward you.
6. Open the tablet PC as far as possible.
7. Slide the keyboard back 1 until the pointing stick cable is
accessible.
8. Release the zero insertion force (ZIF) connector to which the
pointing stick cable is connected and disconnect the pointing
stick cable 2 from the system board.
Disconnecting the Pointing Stick Cable