Dell XPS 15 (L501X, Late 2010) - Manual (Page 105)

System Board 105
15 Carefully ease the connectors on the system board out of the slots on the
top cover, and lift the system board off the top cover.
Replacing the System Board
1 Follow the instructions in "Before You Begin" on page 9.
2 Align the connectors on the system board with the slots on the top cover
and place the system board on the top cover.
3 Replace the five screws that secure the system board to the top cover.
1 AC-adapter connector 2 screws (5)
3 system board 4 Bluetooth-board cable connector
2
3
4
1