Question about LG LMV2083ST Microwave Oven

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Everything turns on and it looks like it is heating up the food, or defrosting, but the food never heats up or defrosts.

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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2 slices of bread wrapped in paper towel microwave set on defrost set 35 seconds caught fire


Microwaves work by friction. They blast water molecules in the food so they move fast, just like rubbing your hands together makes them hot. Some types of microwave in defrost mode actually apply FULL POWER for a short period of time so to make the product warm to the touch. This heat then penetrates down to the core of the food, ensuring full defrost. In your case the heat was sufficient enough to heat the dry paper towel to set it on fire.
Bread is better defrosted on the low power setting as sliced bread is very thin. Items should only be defrosted on the defrost setting that are thick and need to be completely defrosted on the inside. Remember microwaves only penetrate the surface of food, making that hot. Thermal conduction does the rest.
You should never use paper towels in a microwave unless the instructions for doing the food say so. You wouldn't put a paper towel in a gas or electric oven, so don't put them in a microwave.

Feb 18, 2016 | In Microwave Ovens

1 Answer

My emerson microwave turns on but it won't cook or


Check to see if it has a DEFROST SETTING if Defrost setting is on it will not reach an adequate temperature

Jun 07, 2012 | Emerson Microwave Ovens

1 Answer

How do you defrost on the microwave


What is need to set the program, select defrost function then select the weight of the food to be defrosted and push the value of the weight. Now select the heat value and press start as the processor will then decide the time to defrost.
This is a simple program setting or else you can choose a preset heating defroster program.

Aug 19, 2011 | Microwave Ovens

1 Answer

Everything on the microwave works (e.g., turntable lights, controls, etc.) except it will not heat food, defrost food etc. It sounds like a magnatron. Any Ideas before I call a tech? Is there a online...


It does sound like the magnetron, but you need to check the high voltage capacitor and diode because they can be the problem. I don't know if there is a online manual.

Apr 10, 2011 | Microwave Ovens

1 Answer

My delonghi 800w microwave oven works but does not heat up food


If your handy with getting the cover off and looking inside... check the obvious.
I suspect :
fuse
thermister
relay
If both microwave and Heating elements dont work, then I will assume the magnetron is ok, ans we are dealing with a high voltage issue... and you will need at best... a volt meter and or neon troublelight...
moust appliances have a simple schematic inside... I would start with the heating element first... trace wiring back to circuit board... usually one side of the heating element is connected to the white wire (neutral) and live (Hot) side is controlled thru the circuit board... so finding the neutral should be easy... then trace with neon light or voltmeter...

I know easy for me to say... but with everything else working... it doesnt seem to be the microprocessor that controlls the unit...

May 06, 2010 | DeLonghi MW 605 Convection/Microwave Oven

1 Answer

Hello; my oven has been working perfectly. I tried to use the defrost. For doing that I pushed several different pads. Finally with the help of the Owner´s Manual I coudl use the defrost, but the oven is...


It sounds like what you've done is locked up something in the timer. I'd unplug the unit., wait a few minutes and plug it back in. If that doesn't do it, I'd look at whether your unit has some kind of child's lockout that you may have activated. Not that...we've got to look at more issues.

Dec 31, 2008 | Microwave Ovens

1 Answer

GH7145XFB-1 not heating properly


Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Nov 16, 2007 | Whirlpool GH7145XF Microwave Oven

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