Question about LG LMVM1945 Microwave Oven

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I Have a lg microwave oven ( model number - lmvm1945sbq ) that keeps blowing the braker when I try to start it. what is wrong ?

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First off all, I would hope the microwave is on its own breaker, rated at 30A, since the microwave has a fuse rated at 20A.

Normally if the high voltage capacitor is shorted, when you hit the "Start" pad to begin cooking, the fuse will blow instantly.

If you have a problem with the monitor interlock switch, the oven will blow the breaker when the door is closed.

But not always, so it may be a shorted high voltage capacitor, but I would first check for a shorted monitor interlock switch, as well as checking the mounts for all three door switches.

See my help file on door switches here.

Here is a link you or someone you know can use to test the high voltage capacitor, but read their safety warnings first:

http://www.gallawa.com/microtech/cap_test.html

The service manual is here, but it does not contain part numbers.

If you need to order parts, contact Encompass here or call them toll-free at 866-779-5835.

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

Posted on Oct 26, 2012

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It's usually a bad door switch or a broken door switch mount. Once in a while it's due to a board problem. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

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1 Answer

I have a LG microwave oven ( model no.LMVM1945SBQ ) that keeps tripping the braker when I try to start it. Whats wrong ?


First off all, I would hope the microwave is on its own breaker, rated at 30A, since the microwave has a fuse rated at 20A.

Normally if the high voltage capacitor is shorted, when you hit the "Start" pad to begin cooking, the fuse will blow instantly.

If you have a problem with the monitor interlock switch, the oven will blow the breaker when the door is closed.

But not always, so it may be a shorted high voltage capacitor, but I would first check for a shorted monitor interlock switch, as well as checking the mounts for all three door switches.

See my help file on door switches here.

Here is a link you or someone you know can use to test the high voltage capacitor, but read their safety warnings first:

http://www.gallawa.com/microtech/cap_test.html

The service manual is here, but it does not contain part numbers.

If you need to order parts, contact Encompass here or call them toll-free at 866-779-5835.

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

Oct 26, 2012 | Microwave Ovens

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DONT USE IT!

There is an obvious short circuit in the unit. I am surprised you would persist in giving yourself the stress over such a unit as well as risking a fire outbreak in the unit.
Repairing microwaves is just not economically viable, you can pick up a refurbished one or a good working second hand one for about $50-100 A repair is about $200-300 with labor.
Dump it, but first cut off the power cord so some other poor soul doesnt think they found a baragain on the tip.

Please rate my help++++Thanks for using FIXYA

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I am not an expert on Miocrowave ovens, but from past experience I know that they have a number of micro-switches on the door as safety devices. If these switches are faulty, the last safety feature is to short the supply and blow the fuse to stop the microwave from operating in an unsafe condition. Obviously the switches would have to be checked first before jumping to any conclusions and a number of other faults would probably cause the fuse to blow as well.

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Kitchenaid microwave/oven combo model KEMC308KSSO


The keypad circuit board must be replaced to start. Sometimes, the fault can also be on the main processor board.

Jerry G.

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