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Jan 7, 2010 - 26 posts - 15 authors
Hi, I have a Samsung LN40A550 LCD TV which I have had for just over a year. ... I was watching TV yesterday and all of a sudden the picture went all. ... started makinga very high pitched buzzing sound with no picuture coming on. We did have a bunch of green vertical lines, but now just a black screen.
Since the video and audio both are affected, we have to assume it is in the central processor next to the tuner, which separates these two. I suggest you note down the IC numbers, look for its datasheets and study what are the functions of each IC. Then look for any leaky/dry capacitors or dry solders in the board in the surrounding area of the IC. What I normally do is to replace all the electrolytic capacitors in the boards, if the TV is more than 5 years old or its use is so extensive. It is proved from my experience that the TV works like a new one for many more years. But you should do this only after ensuring that the TV is brought back to normal working condition. And, this requires a lot of patience and precision work, lest the boards should get spoiled.
From your description, the sound you are hearing is the inverter(s) that drive the back light for the LCD screen/module.
The inverters mounted on the back side (one lower right and one left side) of the LCD screen/module.They are under the sheet metal cover/shields.
The inverters are going out and or the LCD screen/module is going bad too.
That LG TV has only a 1 year on parts and labor from the date of purchase, but you could call LG and ask for their help for such a new TV.They might do it under a warranty, for little or no cost to you.
I hope this information has helped you.