Dell Precision 7540 Service Manual page 80

f. Align the display hinge caps and replace the 4 (M2.5x4.0) screws to secure the display hinge caps to the system [1, 2].
g. Close the display assembly and replace the 2 (M2.5x6.0) screws at the rear of the system to secure the display assembly
in place.
80 Removing and installing components