Dell OptiPlex 3280 Service Manual page 69

Steps
1. Remove the antenna cables from the routing guides on the display-assembly base.
2. Remove the two screws (M2x2.5) that secure the antenna modules to the middle frame.
3. Carefully peel the copper foil that secures the antenna cables to the middle frame.
4. Lift the antenna modules off the middle frame.
Removing and installing components 69