Mine does this too, just bought it yesterday and noticed the sound this morning, I guess because the house was quiet, now it's the most annoying noise ever. I have been searching for solutions all day, one forum said to go to the picture settings and turn the light sensor to "OFF"...Haven't gotten home to try it yet, but I hope this helps BOTH of us!
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If this "buzzing" sounds like a low frequency hum, then it is probably a loose or bad cable from the equipment. I am assuming you have this connected to an AV receiver or the tv. If the cables are not securely connected or is a damaged cable it causes the ground to be suceptible to "noise". That is what I would check first. Let me know if that fixes the problem, or what you did right before you noticed this issue.
there is a bad or what i call intermittant connection on the power supply board. when the bar and hum appears try firmly bumping with the palm of your hand the side of the set. if the hum and line go away then your set will have to go into the tv shop and the connectors on the p/s mod have to be reseated also the solder connections should be checked... this should help you a lot.
Replacing a flyback is not something I would suggest for anyone with no electronics experience. Second, lets see where the noise is coming from first. Take off the back and listen to the noise. The flyback will be at one end of the large red wires that go to the tubes. Sometimes the connection at the tube is not 100% and the noise comes from there. BE CAREFUL - there are high voltages going through this red wire that can be dangerous even with the set UNPLUGGED!! IF the noise is coming from the connection at the tube, with the set unplugged, carefully turn the rubber cap back and forth touching only the rubber part with one hand. Put the other hand in you pocket while doing this.
If the noise comes from the flyback side, if you can solder, again with the set unplugged, try resoldering the pins on the transformers. That may resolve the problem.
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
I purchased a poloroid tv 3732 in may of 2005 from circuit city, after about 14 months the set began making a clacking sound and humming sound that gets so loud it is unbareable. I have to turn the set off. I have found out I am not the only one with this problem that has a poloroid tv. I had a technician at my home that told me there is a service warranty on these sets because the wrong part was used and the part needs to be replaced.