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Bryan, Home Appliance Technician
Category: Appliance
Satisfied Customers: 12156
Experience:  15 yrs. experience as a certified appliance technician.
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Microwave oven makes loud noise when turned on, a loud buzz

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Microwave oven makes loud noise when turned on, a loud buzz that continues until turned off. Food inside does not get warm.
you have a bad high voltage transformer or a bad magnitron in this. microwaves are extreamly dangerous to attempt repair yourself. they can store lethal amounts of voltage even when unplugged. please do not attempt repair yourself. allot of times its cheaper to replace these then repair them anyway. if you would like i'll get the parts prices for you so you dont get ripped off by a service company. let me know thanks Bryan, p.s. if you want me to look up parts please send me make and model#.
Customer: replied 8 years ago.
I suspect magnetron.
Would appreciate what I can expect to pay for magnetron and hv xfrmr.
Customer: replied 8 years ago.

Sears Kenmore Microwave Hood Combination

Model 665.69642990

this is the magnetron, Part(NNN) NNN-NNNN width=it lists for $184.00 alone and this is the hv transformer. Part(NNN) NNN-NNNN width=$101.00 you can purchase a new microwave for around $200.00 and it makes more sense because your probably going to pay around $80.00 for a service call besides. i would just replace this if I were you. hope this helps thanks Bryan
Bryan and 4 other Appliance Specialists are ready to help you
Customer: replied 8 years ago.

Existing microwave/hood installed in kitchen, above stove. Assume a replacement from Sears would fit in same space (or close enough). Unfortunately, a new unit would be about $600+. Mom's been bugging me to replace a cracked bezel (she has part already), so I'll probably just pull the thing down and fix it (finally..!). She is already familiar with its operation after so many years so would be better if stayed with same unit. Probably end up getting xfrmr and rect too, just to be sure it works first time.
ok extremly careful though, Bryan