Scott M Loganville , GA March 08, 2016 Microwave fan would start on its own I ordered a new pc board and a set of push buttons.The only tools I used was a phillips screwdriver and a digital camera to take a picture of the wiring. The whole process took about 40 minutes. Since the repair a couple of days ago it looks like my problem has been solved. Now the microwave only comes on when it is needed. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes