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This is most likely a defective magnetron, especially with the burning smell. There are two other parts that can be a problem, the high voltage capacitor and diode, all three work together to heat food. If the magnetron is the culprit, probably cheaper to replace the microwave oven.
I would need the model number of the set in order to assist. Often that type of symptom can easialy be fixed depending on what the model number of the TV is.
The problem is with the voltage capacitors and transformers on power circuit board.Some of them has burnt off and so only you are having this smell and popping sound.You have to take voltage readings and test power supply components such as bridge rectifiers and capacitors.
If there is no voltage rating you need to replace that part if not you have to check the soldering joints and solder it again.
All depending on the models, but i have seen and work on may units with this problem, there are a few large capacitors on the power supply that are sometimes doubly secured with glue, that in turn becomes conductive and causes faults like this. check all the large capacitors for any low or nil readings and with a fine point probe, carefully remove the glue on the and around the caos, and elsewhere if you see any. Good Luck.
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