Remove the T-Con board cover screws using a #3 Phillips head screwdriver. You will also need to remove the 4 screws holding down the main board bracket and slide the bracket down to access the remaining 2 T-Con board cover screws.

Carefully disconnect the connections to the T-Con board.

Remove the T-Con board and replace with a functional T-Con board that meets the original board manufacturer specifications (same model board or recommended replacement).