HP Compaq nc6220 Maintenance And Service Manual page 157

11. Position the computer 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 four 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
Maintenance and Service Guide
Removal and Replacement Procedures
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