Compaq 1600XL 21. Shift the board to the left and lift up, then pull out to remove it from the chassis. , To replace the system board, reverse the previous procedures.

PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1600XL SERIES REMOVAL SEQUENCE 49
Presario 1600XL Series
Model 1600T, 1600-XL140, 1600-XL141, 1600-XL142, 1600-XL143, 1600-XL144,
1600-XL146, 1600-XL147, 1600-XL150 XL156, XL157, XL255, XL256, XL257, and XL258
21. Shift the board to the left and lift up, then pull out to remove it from the chassis.
Important: Before replacing the system board, remove all remaining cables.
To replace the system board, reverse the previous procedures.