I just replaced the smart board on the microwave it was ok for about 15 mins then it start to beep. the message read that I needed to get it service that it had shorted out the smart board what caused that ?
You will want to check the wiring for the unit to make sure that there is no damaged wires. Check the door switches to make sure that they are good. You will want to check the system for short to ground and check to make sure that there is not too much power getting to the control board.