Dell XPS 15 (L502X, Early 2011) - Manual (Page 46)

46 Keyboard
3 Slide the keyboard backlight cable into the system-board connector and
press down on the connector latch to secure the cable.
4 Slide the tabs on the keyboard into the slots on the top cover and lower the
keyboard into place.
5 Gently press the top of the keyboard to secure it to the tabs on the top
cover.
6 Replace the palm-rest assembly (see "Replacing the Palm-Rest Assembly"
on page 32).
7 Replace the battery (see "Replacing the Battery" on page 14).
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.