Dell NOT22422 Owner's Manual page 104

Steps
1. Align and place the touchpad FPC into its slot on the system board.
2. Replace the two (M1.4x1.2) screws that secure the touchpad FPC to the system board.
3. Connect the touchpad FPC to the connector on the system board.
Next steps
1. Install the system board.
2. Install the heatsink.
Removing and installing Field Replaceable Units (FRUs) 103