New sanyo baklight inverter making loud buzzing sound

Whirlpool Microwave Buzzing Loudly - ApplianceBlog

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Aug 12, 2011 - 10 posts - ‎2 authors
My Whirlpool MT4155SPS-2 microwave oven has recently started to buzz loudlywhen operated. The sound is getting louder and more frequent ...

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If your microwave buzzes loudly and produces no heat you probably have a defective power .... I have a whirlpool oven range and it's less than a year old. .... Humming sound stops when I open door to remove food, but when door is closed, ...

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Unit uses a Magnetron and likely a power board called an inverter to run it. Someone would have to open the unit in a way where they might pinpoint where the sound is coming from and then take action--does not of course sound normal or good to me.

If it is a high pitched whine or buzz it is likely a transformer vibrating so hard it is making the noise.

There are ways to try to deal with this issue but the set has to be opened and probed to locate where it is coming from--


for example with back off and set on a plastic rod can be used to touch areas and exert slight pressure until the sound changes or goes away--then either replace the part or I have used hot glue etc to stop it.

You first have to locate the source of the issue:

find where it is coming from.

Hi:
The buzzing you hear is the inverter board trying to light the backlights, Check the inverter boards for puffy capacitors tops, There should be two of them on each inverter board..

I had a problem like that so I disabled the tv's onboard tuner (input source)and now we use the cablebox's video and audio out to the video and video in jacks on the TV this will work as long as you have a cable box or sat reciever for your video and audio source and of course your TV must have video and audio inputs so it will work.

Good luck Rich

Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board will get ur picture back.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter baklight board for the replacement.It a long board in shape.

this is the mains input filter choke try coating with a wood type glue

It sounds like a bad internal connection or a component failing. If the picture still is very good take it to a known good repair shop.

It could be the inverter board going bad. The inverter board is what makes the back lights come on and has transformers on it that have high voltage. any time you have a noise like a buzzing or arcing you should have it checked

Have the speakers ever been played loudly? They may have been pushed passed their capacity, in which case, it may be time for a new tv.