Raymond H Chicago , IL May 15, 2020 Microwave oven not heating up the food and making a loud buzzing sound With the help of my wife, we removed the built in oven from mounting bracket over stove. Placed on kitchen counter, disassembled unit. Shelter in place microwave repair 101. Installed magnetron and diode into unit. Reassembled microwave and remounted. Time for some popcorn and voila, works perfectly once again. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours