Brinda G Kirksville , MO November 10, 2014 Our kenmore microwave oven would not heat and made a humming noise My husband fixed the microwave by first discharging the capacitor so he wouldn't get shocked or killed. He then replaced the diode which wasn't the cause of the problem but was cheap to do. He then replaced the magnetron. Problem solved! He's great! Thanks for the parts! It was easy to find what we needed, the prices were reasonable, and shipping was fast! Read More... Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours Tools: Pliers, Screwdrivers