HP ProBook 6550b Maintenance And Service Manual page 147

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.
5.
If it is necessary to replace the optical drive connector board, slide the board off of the system
board. The optical drive connector board is available using spare part number 613314-001. The
optical drive connector board is used only with computer models equipped with a 15.6-in display
assembly.
Reverse the procedure to install the system board.
Component replacement procedures 139