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The microwave suddenly made loud noise this morning while operating and the water didn't heat up after a minute. What's wrong and can it be fixed?

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Most probably something has gone wrong in the magnetron circuit. Because of the loud noise, I doubt it is just a fuse. I'd guess you have a short in the magnetron, diode or capacitor (power circuitry). UNPLUG the unit and remove the case. Look for signs of burned parts (smell and visual), and test with an ohmmeter. Unplug the magnetron and measure pin to pin. You should see low resistance (this is the filament). Measure either pin to frame. You should see high resistance (this is the "tube"). The diode should measure high one direction and relatively low the other. I'll bet on the magnetron, which you can find online (removed from damaged units) fairly inexpensively.

Posted on Nov 12, 2009

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