Dell NOT22188 Owner's Manual page 101

Steps
1. Remove the two (M2x3) screws that secure the display-cable bracket to the system board.
2. Lift the display-cable bracket off the palm-rest assembly.
3. Disconnect the display cable from the system board.
4. Remove the display cable from the routing guides on the system board.
5. Lift up the black flap near the antenna cables and uncover the sensor-board cable.
6. Disconnect the sensor-board cable from the connector on the system board.
7. Remove the WLAN and WWAN antennas (where applicable) from the routing guides on the system board.
8. Remove the six screws (M2.5x5) that secure the left and right display hinges to the palm-rest assembly.
9. Carefully lift the display assembly from the palm-rest assembly.
10. Carefully place the display assembly on a clean, flat surface.
100 Removing and installing Field Replaceable Units (FRUs)