Dell XPS 14 (L421X, Mid 2012) - Manual (Page 55)

5 Lift the connector latches and, using the pull-tabs, disconnect the touchpad cable,
keyboard cable, power/battery status-light cable, and keyboard-backlight cable
from the system board.
1 3 5 7
8
2 4 6
1 hard-drive cable 2 connector latch
3 pull-tab 4 touchpad cable
5 keyboard cable 6 power/battery status-light cable
7 tape 8 keyboard-backlight cable
6 Note the routing of the antenna cables and remove the cables from the routing
guides on the palm-rest assembly.
7 Remove the screws that secure the system board to the palm-rest assembly.
Removing the System Board | 55