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Those sets suffer from backlight transformer failure. Also, not on the main power supply but on one (or two if the set has them) of the backlight modules, if they are separate, you will find bulged capacitors. Also, look under the backlight modules and you may see dark marks under one of the transormers. This means the transformer is failing. I have managed to get backlight modules fairly reasonable on our "favorite" auction sight. They are a common failure.
Is the picture bright, no flickering at all?
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