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Tuner fault. Contact any service technician to replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Does it do this using more than one input? Have you tried using a different source such as DVD? IF using HDMI inputs does it do it on all of them? I have seen this trouble because of configuration issues with some satellite boxes also have seen similar issues because of a bad HDMI input.
I do not want to type the answer to this problem because I do not like to be the bearer of possible bad news. This television having been manufactured around 2006 may have reached the end of its life. As years go by, the picture quality on all LCD televisions diminishes.
Ok, ok, I got that out of the way first. Now forget that I just said all of that for a moment. This television will display a 720p resolution from its component input (green, blue, red, white, red). Make sure that whatever is connected to that input is only set to display images at a 1080i or 720p resolution. A wii or a regular dvd player not a bluray should look ok on the composite/RCA input. I'm not recommending the S-Video input for anything, and of course a computer can be connected to the VGA input still.
If the television looks bad even when displaying content on that 720p input then service can be considered and boards changed if you want to put money into this television rather than purchasing another one.
Usually when you have a red tint when using the component input i'ts because the wires are switched on one end or one of the 3 video wires is bad. See if blue and green are switched.I see this all the time. Is your picture grainy on all input?
for cms voodoo, change your power module. for tomchik, check your input voltage for voltage drop or fluctuation, if any employ voltage stabilizer, then change your power module. make sure that there is enough ventilation around your tv. for bananahead , go and change your backlight inverter