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Constant loud buzzing noise

Constant loud buzzing noise

I have a GE JVM1860SD001 Spacemaker XL 1800. When it is plugged in, it makes a loud buzzing noise and the screen is all scrambled. Upon pressing the buttons screen goes back to normal it cooks but tray doesn’t turn and loud buzzing noise continues so I have to unplug it at all time. What causes this?

ANSWERS:

"Cause 1

Magnetron

The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances, the magnetron emits a low hum. However, if the magnetron is damaged or nearly burned out, it may begin emitting high-pitched sounds or growling noises. If the magnetron is noisy, this indicates that the magnetron is nearing the end of its life or might be defective. A defective high-voltage diode can also cause the magnetron to be loud. Before replacing the magnetron, first test the high voltage diode. If the diode is not defective, replace the magnetron. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the magnetron.)"

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