Question about LG LMVM2075 1000 Watts Microwave Oven

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LG microwave The microwave runs, lights comes on but doesnt heat my food. please let me know if you know any soulution i can try. thanks.

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Re: LG microwave

High voltage parts are suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing either the magnatron or the high-voltage capacitor and diode. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

Posted on Jan 18, 2008

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The wave emitting part inside the microwave oven is called the magnetron. The waves emitted by the magnetron generate heat in food. When the microwave is running, turntable turns and light comes on but there is no heat it means that either the magnetron is faulty or the magnetron is not getting power. When the magnetron is not getting power parts such as the high voltage diode or capacitor must be tested or replaced. Testing and repair must be carried by a technician. Here some general troubleshooting:



Sep 07, 2011 | Microwave Ovens

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Microwave light comes on and turntable revolves when food is put in, but it doesn't heat food up. Food remains cold, can you help? thanks Dee

9 times out of ten it is the magnatron that has gone bad, that is the device that creates the microwaves for heating the food. Check inside the cabinet for fuses and if none found or blown then it is the magnatron. These are available widespread but most cost about as much as a new oven, so do a google search on your make and model of microwave and search for a magnatron for that unit. This will bring up parts suppliers and their prices and you can decide if it is worth fixing or replacing

Apr 04, 2011 | LG Microwave Ovens

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There is a device in your microwave oven called a magnatron. This device generates the microwaves which heats up the food. If all is working but there is no heat, it means the magnatron is faulty or perhaps part of the magnatron circuitry. Check all fuses and then have the magnatron tested by a qualified technician if all fuses are okay.
Please let me know if this has helped solve your problem.
Best wishes,

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est the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

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LG Microwave LMV1650st wont heat food

Hi eb6181,

If it's within warranty, I'd exercise that and get it fixed.

Usually, if it appears to run, but isn't heating, the magnetron has gone bad. It's not a cheap part, and not really a DIY (do-it-yourself) operation. If your warranty covers the part, that will help a lot.

Even if not within warranty, I'd have an authorized service center do the job. They should have a list of authorized outlets with your manual and other literature. They can also give you a quote as to how much it will cost - - only you can make that call.

I had a magnetron replaced once, it was spendy, but ~20 years ago, microwaves were a lot more expensive than they are now.

If I can be of further assistance, let me know. If this helps or solves the issue, please rate it accordingly.

Thanks in-advance for using,


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Chances are you have shorted or blown high voltage rectifier diode.

Here is a link you or someone you know can use to test it, but please read the safety info:

To order Goldstar / L.G. parts, visit Vance Baldwin Electronics.

For more Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

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

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