HP Compaq nc6220 Maintenance And Service Manual page 134

Removal and Replacement Procedures
11. Position the notebook with the front toward you.
12. Disconnect the following cables from the system board:
1 Audio board cables
2 Serial connector cable
3 RTC battery cable
13. Remove the 4 T8M2.0×8.0 screws 4 that secure the system
board to the base enclosure.
Disconnecting the System Board Cables and Removing the
System Board Screws
5–54 Maintenance and Service Guide