Microwave not heating and giving burnt plastic smell

Once the plastic is yellowed, there's not much you can do to remove the yellow discoloration. Just continue to use your microwave as usual. If a burnt smell remains, you can heat vinegar in the microwave which will help eliminate the horrible odor--like burnt popcorn!!!! Yuck!

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The loud noise and no heat means that the magnetron has failed. It the part that generates the microwaves that heat the food. When it fails it shorts out, causing the transformer to heat up. That is what was causing the burning smell. The cost of a replacement magnetron is around $130-150 range so it may not make sense to have it fixed.

Yes it is definitely the magnetron and yes you could change it your self if you are good with electronics and tools (considering that the MAGNETRON DRIVER CIRCUIT is OK) but it is normally cheaper to buy a new microwave oven

Sorry!

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
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That would be the support, and you can find it by entering your model number UMC5200AAS here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

I have the same problem on my oven- model JVM1640WB and called an appliance repairman who is honest and reliable (I've used him before). He said the problem is with the electrode, to fix it is roughly $300. He recommended buying a new microwave rather than fixing it.

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.

That's usually a bad magnetron. This one has a 5-year warranty on the magnetron, so you should only have to pay for labor to get it replaced. I would call Maytag at 800-688-1120.