LG LMV1680 Microwave Oven Logo
Posted on May 15, 2011
Answered by a Fixya Expert

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Very loud motor sound - smells like something is burning... and it doesn't heat at all

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Bernhard Pahl

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  • Contributor 14 Answers
  • Posted on May 16, 2014
Bernhard Pahl
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Sorry, this is not a solution but a simple fact. There are many household service shops around because they know how to cheat and charge you for a new magnetron whilst it may only needed a new fuse or a switch costing pennies. On top of all that comes the chance for them to get hold of your Microwave oven at no cost because you may decide to get a new oven and leave yours at the shop. They then fix it, sell it or make big money from using or selling the parts.
My advise, if its an older model, dump it and get a new one with a few years guarantee. As a guide, a magnetron should last around 5 years.

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  • LG Master 6,771 Answers
  • Posted on May 15, 2011
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The magnetron in the microwave has failed, "heats food" and some cases gives off an odor that stands out. To repair the oven will approach the price of a new one

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XL1800 buzzes but heats

If the magnetron was making louder noises prior then replace the magnetron. While the cabinet is open make sure to look for burned wires, check the continuity of thermal cutoffs, and check the main circuit-board for burned traces or components. The relays in most electronics are known for arcing (spot welding) and staying in the wrong position. Tap them hard with the back end of a screwdriver.
You may have to replace the capacitor too. During all of this use safe electrical practices by having the power cord unplugged. The capacitor could still have a high charge on it so be careful.
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Burning smell and loud grinding noise

If that grinding noise sounds a little like gargling into a coffee cup, that's a defective magnetron.

You can download GE owner's manuals and installation instructions here.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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My Kenmore 721.626222 which I have had about 6 years, runs but does not heat. There is also a strange smell - something like a burning smell.

When the oven does not heat, the problem is usually due to the magnetron failing. It the part that generates the microwaves that heat the food. It fails by shorting out causing a loud buzzing noise. The burning smell is the being magnetron overloaded due to the short. It not worth fixing since the replacement cost of a magnetron is close to the price of a new oven. Sorry.
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It makes a sound when on and smells like burning

If it's an arcing sound, there may be grease or food particles on or behind the waveguide cover or in the area of the turntable motor.

Otherwise, it's likely to be a failing high voltage part:

- A sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound. Usually it will not heat is this is the case.

- A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but if this were the case, it would not heat.

- Sometimes a high voltage transformer will cause a loud hum and burning smell, too.

Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

To allow us to help you effectively (at no charge), please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, and your specific symptoms.

Let us know which of the examples we gave seems to be closest to the sound you're experiencing.
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We have an MMV5165AAB Microwave oven, installed January of '06. It has always made some loud sounds, which generally go away. But today, when I tried to microwave soup for 1 minute and 20 seconds, it gave...

the unit inside the microwave that heats called the "magnetron" has gone bad or the circuits that power the magnetron have failed. if its under warranty still, send it back to the manufacturer. if not you can call some repair shops and see how much it would be to service it, but its most likely going to be cheaper to purchace a new microwave since they are relatively cheap these days. microwaves are throw away product now days, they dont make them to last anymore, i hope this helps and good luck to you
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Our Sharp microwave oven turns on, makes a loud humming noise, starts to smell like something is burning, but doesn't heat. Well, actually, we don't think it heats, we're too scared to let it run because...

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Not heating and making a loud humming noise.

you have done well out of the oven . it sounds that certain components are well worn and probably no able to get parts best advice it time to buy a new one
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Microwave makes loud noise and does not heat. Smell of light burning

The noise is coming from the high-voltage transformer being overloaded by something shorting it out. Either the magnatron or the high-voltage capacitor and diode. Replace the capacitor and diode then if still not working, replace the magnatron. Its only affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!
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