Question about Microwave Ovens

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LG Microwave LMVM2055ST Just stopped working!

I was using my microwave and it just stopped, no power at all. Checked Circuit breaker and nothing was blown. Does this microwave have a fuse that possibly needs to be replace? Microwave is just over a year old. Mine just did the same thing. It just stopped working. The outlet has power, but the microwave does not.

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  • 8596randy Dec 11, 2008

    my lg microwave oven model # lmvm2055st just quit power is good at the outlet, but microwave has no lights it dead.

  • Anonymous Apr 02, 2009

    LMVM2055ST Just stopped working!"

  • delflash May 19, 2009

    same as described by other, ran for about 15 min. and just quit. acted like a fuse had blown, checked CB and also checked for power at receptacle.

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  • Microwave Ovens Master
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We have the service manual for this model and have uploaded it to our site here to help you.

You will need the
free Acrobat Reader to view or print it in case you don't have it.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.


If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

To order Goldstar / L.G. parts, visit Vance Baldwin Electronics. You'll probably have to call them.

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

Posted on Dec 13, 2008

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  • Contributor
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It has probably had an overhesat problem and the repair is quite simple. First you must remove the cover. This will require the removal of alot of scres on top, bottom and rear of machine. Once done, looking down at the top of the microwave all the way to the left about half way from the front to the rear you will see a round senso with two black wires going to it. This issimilar to a fuse and when you remove it, you can test it with a continuity testor. Electric should flow through it with no resitance. If it does not, it must nbe replaced. It's about ten bucks.

Posted on Nov 20, 2009

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Posted on Jan 02, 2017

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