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To avoid personal injury or death, disconnect your appliance from its power source before you start any troubleshooting or repair work. Use caution when working inside any appliance.
A loud buzz from inside your microwave oven can mean that you may have a defective diode, triode, high-voltage capacitor, or even a faulty magnetron. This problem almost always means a bad magnetron, followed by a bad diode. Call a professional appliance repair person for assistance.
Appliance Repair Forum