Dell Alienware 15 Service Manual page 117

10 Lift the system board off the computer base.
1 system board
11 Turn the system board over.
12 Follow the procedure from step 1 to step 2 in "Removing the
assembly".
13 Follow the procedure from step 1 to step 2 in "Removing the
battery".
2 screws (6)
heat-sink
coin-cell
117