Dell Inspiron 3521 Owner's Manual page 32

3 Turn the computer over and open the display as far as possible.
4 Lift the connector latches and pull the pull-tab to disconnect the touchpad cable
and the power-button cable from the system board.
1 touchpad cable
3 connector latches (2)
32
| Removing the Palm-Rest
2 power-button cable
1
2
3