Question about LG LMV1680ST Microwave Oven

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Microwave model MV-1510M is not heating, also sounds louder. Everything else is working, fan, lights, turntable etc..

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If everything is working normally, except for heating, the likely cause is the magnetron.  Microwaves can be dangerous to work on, as the site below points out.  If you have an ohmmeter, it is possible to check the magnetron, but be certain to follow the precautions outlined at the webpage:
http://www.gallawa.com/microtech/mag_test.html

Posted on Oct 08, 2010

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1 Answer

Not heating


Please post a new help request here on FixYa and include the full model number from the tag in the cooking cavity or elsewhere on the microwave, such as the door frame, controller frame, etc. and please answer the questions below.
When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

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We would need to know the full model number from the tag in the cooking cavity or elsewhere on the microwave, such as the door frame, controller frame, etc.

Please post a new help request with that and more detailed symptoms, such as when it occurs.

When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

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If the microwave is 7 years old or less, there are too things that come to mind, defective magnetron, or the inverter board, cost should be considered when going ahead with repairs.

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It sounds like the micro generator has died.

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If the oven is doing everything else properly (light comes on, fan runs, turntable goes around) but there's no heat, you may have a failed magnetron tube (the microwave source). There's also a relay that controls power to the tube that may not be working correctly, or the control circuit board is bad. It's also possible one of the door switches is not working (so the oven thinks the door isn't closed), although this usually keeps the turntable and fan from running.

Microwave oven service is not for do-it-yourselfers. There are potentially deadly voltages present even with power off, and a chance of microwave leakage if repairs aren't done properly. Let a professional give an estimate to repair it, or just replace it if it's under $100. (When I was servicing these things it wasn't unusual for a repair to cost over half the price of a new one. That's one of the reasons so few shops still work on small appliances.)

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Everything appears to be working with our microwave except it is not heating or cooking. All other functions appear to be o.k. I am not 100% sure of the model number and I'm not at my house to get that...


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, your symptoms ("runs but no heat"), as well as the answers to these questions:

- When you try to microwave are the inside light, internal cooling fan and turntable all working?

- Is there any unusual noise or is it louder or quieter than normal?

(A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but 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.)

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

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1 Answer

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So we can help you, please post a NEW question, and please include your brand name and the full model number from the tag in or on the unit, as well as the answers to these questions:

When you try to microwave are the inside light, internal cooling fan and turntable all working?

Is there any unusual noise or is it louder or quieter than normal?

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but 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.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

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

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Sounds like the table motor may have an issue. You might want to consult you local repair depot for an estimate. Sometimes the repairs are more than the appliance...beware!

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Everything works but no heating?


With inside light and turntable on, louder sound, and no heat, this is usually a shorted high voltage rectifier diode or a bad magnetron.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

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1 Answer

Microwave not heating.


check magnetron related circuit and replace magneron, check condencer, diode and etc.,

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