HP Pavilion DV4-2155 Maintenance And Service Manual page 78

Removal and replacement procedures
5. Remove the three Phillips PM2.5×3.0 screws 1 and the Phillips PM2.5×8.0 screw 2 that secure the top cover
to the base enclosure.
6. Lift up the front edge of the top cover until it releases from the base 3.
7. Remove the top cover 4.
Reverse this procedure to install the top cover.
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