Dell Inspiron 14 (3420, Mid 2012) - Manual (Page 26)

4 Remove the keyboard. See "Removing the Keyboard" on page 15.
5 Remove the three 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.
Palm-Rest Assembly 26