HP TC4400 - Manual (Page 108)

Removal and Replacement Procedures
Maintenance and Service Guide 5–25
5.11 Heat Sink
1. Prepare the tablet PC for disassembly ( Section 5.3 ).
2. Remove the keyboard cover ( Section 5.8 ).
3. Release the keyboard ( Section 5.9 ).
4. Remove the fan ( Section 5.10 ).
5. Remove the four Torx8 T82.5×8.0 screws that secure the heat
sink to the tablet PC.
Removing the Heat Sink Screws
Heat Sink Spare Part Number Information
Heat sink (includes thermal paste) 419161-001