HP TC4400 - Manual (Page 120)

Removal and Replacement Procedures
Maintenance and Service Guide 5–37
9. Turn the tablet PC right-side up with the front toward you.
10. Open the tablet PC as far as possible.
11. Disconnect the wireless antenna cables from the Mini Card
WLAN card 1.
12. Disconnect the microphone cable 2 from the system board.
13. Remove the wireless antenna cables and the microphone
cable from the routing channel 3 and clips 4 through which
the cables are routed.
Disconnecting the Display Cables