HP TC4400 - Manual (Page 136)

Removal and Replacement Procedures
Maintenance and Service Guide 5–53
5.20 Infrared Board
1. Prepare the tablet PC for disassembly ( Section 5.3 )
and remove the following components:
a. Hard drive ( Section 5.4 )
b. Keyboard cover ( Section 5.8 )
c. Keyboard ( Section 5.9 )
d. Button board ( Section 5.16 )
e. Display assembly ( Section 5.15 )
f. Top cover ( Section 5.17 )
g. Speaker ( Section 5.19 )
Infrared Board Spare Part Number Information
Infrared board (includes infrared board cable) 419113-001