Question about LG MV-1444Y Microwave Oven

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Galaxy microwave I put something in micro for 2:30. After 15 seconds heard loud pop and smell of burning plastic. I opened front cover but can't see any burn marks. I think it could be the capacitor but I'm not sure. Any help?

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When the high voltage capacitor fails, it almost always shorts, always resulting in a blown fuse.

Your problem is most likely a shorted / blown high voltage rectifier diode.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/xformer.html
http://www.gallawa.com/microtech/mag_test.html

To order parts, the best i can suggest is to call the number in your owner's manual or have a local appliance parts store match them up.

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

Posted on Sep 27, 2008

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If it buzzes real loud it's probably the high volyage diode. However some times if it smells it's the transformer. Usually the diode is a cheap fix ~$10.00 but this model the diode is $50. It's number 50 on the link below. Let me know how it works out or you need anything else.

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=JVM1440BH01&productCategoryId=0123370&brandId=0432&modelName=MICROWAVE&diagramPageId=00001&documentId=G0312014&pop=flush

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Hello jeffnlaur,
The sound you heard could be any number of things but I would attempt to verify the basic preformance of the microwave was ok by placing a cup of water in the cooking compartment and switching the micro on for about 2 minutes.. The water should be close to or at a boil after this time ( depending on glass type and power output of oven). Listen for any other irregular sounds while it is running. You may have heard something in the soup pop or some of the electronics within the micro arc but it may not mean it is dangerous. Try the water test first and if it continues to exibit internal noises and burning a burning smell, I would discrad the oven. Table top models are very inexpensive and the cost to diagnose and repair would probably exceed the cost to replace,
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Quite often this is due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.

The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.

In some models it is a larger stirrer cover type made of thicker plastic in the ceiling of the oven.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

If your waveguide cover is burned, it will need to be replaced. It provides important protection for the magnetron.

Please reply back with more details if this does not solve your problem.

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

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