This could be the backlight failing (most often the images will tend to go pink). If the TV is out of warranty, you can replace the backlight(s) yourself. lcdparts.net has many backlights but you need to match the length and width to the original. Next you need to open up the back of the TV and carefully remove the old backlight(s). The backlights are on the perimeter of the TV (laptop screens started with one but most TVs have several to maintain an even lighting of the image).) The removal takes some work and paying attention to how the original is put together. The backlights are often molded into the frame of the TV and a Dremel or other rotary tool is needed to get the backlight out. Google backlight replacement for videos, pictures and descriptions of the process.
I hope this helps.
Cindy Wells
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