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LG LC55 humming/buzzing

My lg lc55 makes a humming /buzzing sound when its switched on,its really annoying when the sound is comes from the left hand side of the tv(when facing the back of the tv).didnt know if it was a fault or just a noisy product like my xbox360...

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Re: LG LC55 humming/buzzing

Have you tried adjusting the contrast? , have a similar problem with a 42'' lcd and it appears to be related to the contrast setting .If is set my contrast below 90% the buzzing sound stops.
This buzzing sound seems to be a common problem with LG TV's

Posted on Mar 12, 2008

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Why does my 42 inch lg tv make a buzzing sound that flickers high and low and even when the power is off

Sounds like a relay or transformer that is on its way out. I would suggest taking the set to a TV service Agent and getting it sorted before it dies altogether.

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A common cause are failure of decopling capacitors in the audio section, and or the circuit board power distribution that feeds the audio board. Most of the capacitors are surface mount components. The standard fix is to start by changing the circuit boards that have the defective parts.

If the set is under warranty, call for warranty service. Out of warranty service is expensive for these TV sets.

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How to fix sound on my lg 42

Some simple things you may already have tried but I will list:

Unplug set for a while and then plug back and see if sound--when unplugged the set may reset.

In main menu make sure speakers are not switched off.

I doubt it is mute but if also using some type of box check that its volume is not all the way down.

If internal speakers put your ear right to them---hear low sound or a buzz or hum?

If using external speakers of any kind look at the hookup and switch to make sure internal/external is correctly selected

If NONE of these help you have an audio problem and should first contact LG (yes it takes time on the phone) to inquire if some common issue or a possible software upgrade is available for this.

Last: Some failure has occurred either in the audio circuit or something that feeds it.

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Lg lcd tv humming sound which varies throughout a programme no rhymn or reason to it but especially noticeable when quiet part of programme

Alot of Tv's have this sound that comes from the speakers or the back of the set. Its normally when the transformers inside are underload they start buzzing. this could come from the Powersupply or the Inverter. When changing channels they change their tone sometimes.

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Mine i notice also when scrolling around menus seems to have lines that follow your selection....not to pleased about that

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Ur power supply board.Transformers have have high voltage gap.This problems must take the tv aparts put some glue arond the transformers,sometime solved this problems,or must replaced all the trnsformers make the humming noise.Brand new tv take it back,where u bought it get a replacement or call the Manufacture help to fix the problems or replaced the part that cause the problem.

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This is probably a defect in the backlight inverter circuit. The transformer may have a loose winding or something in there is not cycling off or on properly. If you can still collect on the warranty, do so.

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