HP ProBook 4520s Maintenance And Service Manual page 67

Remove the power button board.
1. Release the ZIF connector (1) and disconnect the ribbon cable (2) from the system board.
2. Remove the screw (1) that secures the power button board to the base pan and the slide the
board out of the retainer (2) to the left (3) to remove it.
Reverse this procedure to install the power button board.
Component replacement procedures
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