HP TC4400 - Manual (Page 129)

5–46 Maintenance and Service Guide
Removal and Replacement Procedures
7. Disconnect the TouchPad cable from the system board 1.
8. Lift the rear edge of the top cover 2 until it disengages from
the base enclosure.
9. Lift the top cover straight up 3 and remove it.
Removing the Top Cover
Reverse the above procedure to install the top cover.