If you hear a very loud buzzing, it is probably a shorted high-voltge diode. This may be a small black stick wired to the high-voltage capacitor (metal can with two terminals), or could be inside the can.
You would have to replace it.
I doubt if the magnetron is bad, they are very reliable and last a long time.
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I may be able to help further by emai to tlamb at montrose dot net. I designed microwave ovens for 30 years.
If you hear a very loud buzzing, it is probably a shorted high-voltge diode. This may be a small black stick wired to the high-voltage capacitor (metal can with two terminals), or could be inside the can.
You would have to replace it.
I doubt if the magnetron is bad, they are very reliable and last a long time.
I may be able to help further by emai to tlamb at montrose dot net. I designed microwave ovens for 30 years.
TOM