HP Pavilion DV6-1378 Maintenance And Service Manual page 179

2. Remove the USB/power connector board cable 1 from the
clips in the base enclosure.
3. Remove the two Phillips PM2.5×5.0 screws 2 that secure
the system board to the base enclosure.
Removing the System Board Screws
Maintenance and Service Guide
Removal and Replacement Procedures
5–63