Dell Inspiron 15 (N5040, Mid 2011) - Manual (Page 30)

30 Palm-Rest Assembly
4 Remove the keyboard (see "Removing the Keyboard" on page 15).
5 Remove the two screws on the palm-rest assembly.
CAUTION: Pull on the plastic tab on top of the connectors to avoid damaging the
connectors.
6 Lift the connector latch that secures the power-button board cable and
touch-pad cable to the connectors on the system board and remove the
cables.