Question about LG 30" Over the Range Microwave Hood with Glide & Cook Tray, LMV1645S

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Vibrating Noise and Electrical Smell

Used the microwave for six weeks when it began having a loud vibrating noise and electrical smell. Sent for repairs where they first said they could find nothing wrong. They then replaced the magnetron. Used three times and the noise and electrical smell has started again. Still under warranty.

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The noise and smell usually come from a bad transformer. If the magnetron has burned out usually the transformer will need to be replaced as well. The transformer is right behind the grille on the right hand side.

Posted on Mar 11, 2007

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Posted on Jan 02, 2017

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How do I get rid of the noise?


Hello, Sarkis -

I found 4 descriptions of what may be causing the noise when you operate your microwave oven. See the information on all 4 possible causes here:
https://www.repairclinic.com/RepairHelp/How-To-Fix-A-Microwave/78-88--/Tappan-Microwave-is-loud-or-noisy

Note: Safety advice I have read regarding microwave oven repair is to have a microwave oven repaired only by an authorized repair technician. It is not do-it-yourself work.

Any repair might not be worth the cost compared to purchasing a new replacement. A microwave repair technician authorized to work on Tappan microwave ovens will be able to evaluate what is causing the loud noise and give you an estimate of the repair costs.

Note: If you find you need to replace your microwave oven, please be sure the old microwave oven is sent to electronics recycling.

Best wishes.

Feb 15, 2018 | Tappan Microwave Ovens

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We were using the microwave the other night and it started making a loud noise like the fan was running (although the fan was not). We let it sit for awhile and try to use it again but the noise came...


The loud noise and no heat means that the magnetron has failed. It the part that generates the microwaves that heat the food. When it fails it shorts out, causing the transformer to heat up. That is what was causing the burning smell. The cost of a replacement magnetron is around $130-150 range so it may not make sense to have it fixed.

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After about 2 weeks of use, the microwave began to make a horrible buzzing noise from the "box" in the upper right hand corner on the back. It also smelled horrible. It then proceeded to stop working...


Two weeks? This is a warranty problem. The buzzing noise was probably either from high-voltage arcing or an overloaded transformer trying to drive a shorted component. The smell is from something electrical getting fried. Remember it; the next time you smell it, you'll know to pull the plug.

Oct 12, 2010 | Sunbeam SMW777 Microwave Oven

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Purchased microwave in 2005, just stopped heating and now its making a loud noise


if the loud noise is like a vibrating noise then it sounds like the high voltage diode.

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When the door was closed and the microwave was started,a very loud noise with an electrical burn smell occurred. I was microwaving a small microwave safe cup of milk. The built in microwave was...


hi,smell is probably the magetron,arcing...is the inside of the microwave,any burnt marks....hv diode an magetron might be bad...possible shorted hv diode....

Nov 05, 2009 | Microwave Ovens

1 Answer

Washer is making a loud noise when its trying to rinse


you will have to open up the panel to check where the smell comes from. It could be on the motor which may cause also a loud noise or from the electrical, loose connection or bad relay may cause a noise of a different kind.

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1 Answer

JVM 1660WB 003 GE Profile Microwave humming sound/burning smell


the magnetron the unit has gone bad.sometimes there is burning smell as u mentioned.it is little expensive repair arond $ 150.00.find out the price of new unit plus iistallation/delivery chg and then make a decision.

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