Dell OptiPlex 7760 All-in-One Service Manual page 77

NOTE: Use the pull tab to disconnect the I/O board cable from the system board.
b Remove the I/O board cable, I/O-board power cable, and headset port cable from the routing guides on the display assembly
base [2].
c Remove the two screws (M3x5) securing the I/O board shield to the display assembly base [3].
d Lift the I/O board shield from the display assembly base [4].
4 To remove the I/O board:
a Remove the headset port cable from the routing guide on the I/O board [1].
b Remove the two screws (M3x5) that secure the I/O board to the display assembly base [2].
c Lift the I/O board with its cables from the display assembly base [3].
Removing and Installing components 77