The most likely causes are defective a door switch (or switch mount), a bad connection in the high voltage section, or on the controller. I would direct you to my safety text file and door switch text file for critical safety info anf info on testing & replacing door switches. You can find it via searching on Yahoo.com (not Google) for: microwave safety.txt After you check that out, please repost so we can hel you further.
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I messed up a little in my previous, It was an MV1526W. It also made aloud buzzing noise too. Diode?
daewoo kor- 63fbsl 1000/700watt. 2450mhz. problem.. no heating of food.. found inline fuse between capacitor and transformer at magnatron had overload symtoms in glass fuse [ fuse is a slow blow or anti surge 5kv.550mA 41mm x5 mm ] 14 months old.
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