Dell NOT22397 Owner's Manual page 101

Steps
1. Remove the three (M2.5x3.8) screws from the left hinge.
2. Lift and remove the left hinge from the display assembly.
3. Remove the three (M2.5x3.8) screws from the right hinge.
4. Lift and remove the right hinge from the display assembly.
100 Removing and installing Field Replaceable Units (FRUs)