Have you seen the videos showing how to get behind the touch screen, dust off the board, disconnect and then reconnect the wires?
We pulled out the touch screen, disconnected and reconnected some wires AGAIN. The touch screen came back to life for a while, but is back to being tempermental. The "one minute" button works, so the microwave is operational; as does "Popcorn" (which we don't use). We just cannot navigate to "Melt" or "Defrost."
As I really do like the variations offered with this microwave oven, I am considering purchasing a control board for $207 to see if that will fix it. At one point, the touch screen was available for $600, which is prohibitive.
I wish I had better news for you. I do think that time is working against us as the replacement parts are getting phased out.