HP Pavilion dv4200 Maintenance And Service Manual page 172

Removal and Replacement Procedures
7. Lift up on the left side of the USB board frame 1.
8. Press down on the right side of the system board shield 2
until the shield tab 3 disengages from the standoff on the
bottom of the USB board frame.
Releasing the System Board Shield, Part 2,
HP Pavilion dv4200 Models
5–66 Maintenance and Service Guide