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Our fairly new LG microwave has stopped heating. Serial n. LMV164ODB1 Is there a fuse somewhere? We had a power surge could that had caused the problem? Any other suggestions?

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The best bet , due to it being a power surge, replace the high voltage capacitor, the high voltage fuse and the magnatron assy. good luck.

Posted on Jul 12, 2009

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Always put a microwave back together to test it. A mobile telephone in the vicinity will also check a microwave for leaks.

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I guess the main plug fuse does not blow for the same reason it does not blow and you can wreck a PC, although not certain why that is. I have a feeling from past work on a Panasonic that there is an internal fuse as well. This may have blown with the power surge.

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Dan, That unit has an inverter, that is the power source for the part that puts out the Microwave energy called the Magnetron. The inverters are expensive and I stopped doing warranty work for Panasonic beacuse of them. Some pencil pusher somewhere though it was a great idea to replace 3 common fairly inexpensive parts. with that dang inverter. Microwaves have come down a lot in cost, I would buy a new one without an inverter. Sorry, wish I had better suggestions, I DO NOT LIKE THEM. LOL Sorry! Panasonic and their distributors are always out of them and there so expensive no one wants to stock them. I have had new ones sent to me that were already bad.

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Hi there, I have a LG model: LMV1640DW1 microwave oven. Everything seems to be ok, but does not heat my food. The microwave is fairly new (feb 2008)


Possibly high voltage fuse or diode.If it is an inverter model may be circuit board problem.Not advisable to try and fix yourself very high voltage build up could still be present, contact your local repairer.

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My LG LRMP1270ST microwave oven stopped working in the morning. It just flat died when I put 2:00 minutes on the timer and pressed start I heard the pop/breaking sound. So immediately I stopped the...


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1 Answer

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It may have killed the processor if it is a fairly modern one. Here's a couple of ideas.

If your appliance has absolutely no functions at all, remove it from the mains supply, remove the case and see where the mains lead goes in to the appliance and follow the cable until you find the main fuse.
ONLY USE THE SAME TYPE AND RATING OF FUSE TO REPLACE IT.
The usual cause of this fuse failure is the door switches are contaminated or sticking. Check the door switches before putting power back on to the appliance.
Hope this helps.

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1 Answer

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fuse is a easy fix, remove the cover, the fuse is located on the board. Most times the fuse is a indication of a bigger problem, sometimes a new fuse will fix if a power surge or metal in the oven caused the problem.

let me know what you find

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It probably blew the main power fuse in side the oven. This may have happen because of a failure in the microwave or a line voltage surge or what ever. Repalce the fuse and see if it work. be sure to unplug it before doing this, If this does not fix it then you have a failure in the oven some were.
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1 Answer

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Possible causes include a blown fuse or high voltage diode. A bad magnetron or power transformer are also possible. I recommend taking the oven to a repair facility, or scrapping it & getting a new one. Do not attempt to repair this yourself, as microwave ovens have voltages present inside which are INSTANTLY LETHAL, & there are no user servicable parts inside.

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