HP ProBook 6455b, 6555b, 6450b and 6550b Notebook PCs Maintenance and Service Guide

2. Remove the three slotted Torx T8M2.5×7.0 screws (1) and (2) that secure the system board to
the base enclosure. The front-most screw (2) is present only on computer models equipped with
a 15.6-in display assembly.
3. Use the middle of the system board (1) to lift the right side (2) of the system board until it rests at
an angle.
4. Remove the system board (3) by sliding it away from the base enclosure at an angle.
CAUTION: Do not attempt to remove the optical drive connector board from the system board
until after the system board has been removed from the base enclosure. Failure to follow this
caution can result in damage to the system board and the optical drive connector board.
Component replacement procedures 137