Dell OptiPlex 5270 All-in-One Service Manual page 86

2. To replace the I/O board shield:
a) Place and align the screw slots on the I/O board shield to the slots on the display assembly base [1].
b) Replace the two screws (M3x5) that secure the I/O board shield to the display assembly base [2].
c) Route the headset port cable, I/O board cable, and I/O board power cable through the routing guides on the display assembly base
[3].
d) Connect the I/O board cable, I/O board power cable, and headset port cable to the system board [4].
86 Removing and Installing components