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Just had the same problem. It was an electrical short and the repairman said that it could have burned the kitchen wall and been a catastrophy. Get rid of it immediately!
Is the smell ionized (the outside smell of a cold winter morning air) or more of an electronic component burning??? if it's more of an ionized smell it could be normal, (if the smell is strong) it could be a leaking high voltage cable (electric arching) bad insulator, if it's more of an electronic component burning smell, it could be a overheating component, in both cases you should have it checked by a professional technician...
HI, normally, when you smell the burning electrical wires and board components, this will confirm a major capacitor malfunction. in this case, all electronic component will be fried or destroyed. these parts are the running diode,magnetron tube,cut-off fuse,noise filter and control board as well. all these parts will be costly to replaced, and it will be more cost effective to just cut your loss and purchase a new unit. the newer unit will be cheaper than the actual repair bill in this case.
More common then you think, i have gone through a couple microwaves in the last ten years, they both failed very similar to what you describe. One popped the breaker one day, reset the breaker and it worked again but had an odd smell to it. I took it apart and couldn't find anything burnt or melted so i tossed it and got a new one, i didn't want a microwave burning the house down! I would suggest unless your really tied to that microwave that you just replace it for safety sake. Four years or forty years old don't matter anymore, i had one microwave, LG brand, that died two months after the warranty expired and it would cost more to repair it then replace the thing!
the control circuit shorted out from the cleaning session and kept the
microwave on so long with nothing to cook that it has cooked itself I'm
sorry to tell you. Probably not worth repairing
Sounds like you just fried your magnetron. Normally when they go bad, they make a very loud noise like what you described. The smell concerns me because you may have ruined the waveguide as well. If the magnetron burns through the protective painted surface of the waveguide, the waveguide is ruined. In most microwave ovens this means replacing the entire unit because the waveguide is not replaceable. Putting a new magnetron in a damaged waveguide will result in the same arcing and eventual failure. In addition to the magnetron, the following components are part of the same high voltage network:
HV Transformer
HV Diode
HV Capacitor
Magnetron Thermal Cut-Out
Any one of these components could have also been damaged. I DO NOT recommend taking any voltage measurements inside the HV network. Potentials of over 4000 volts can be reached and make it very dangerous for the do-it-yourselfer. Taking resistance readings with the unit unplugged is strongly encouraged. If you decide to pursue a repair, inspect the magnetron tip and inside of the waveguide first. If the magnetron is melted and/or there are burn marks inside the waveguide, a new microwave may be a in order. This actually may be a better option than an expensive repair. I hope you find this advice helpful.
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