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I've seen that before with TVs after a fair bit of use, it's caused by a blown capacitor on the board. My suggestion would be to take it into a TV repair shop in your area as it's a fairly easy fix for professionals.
If you are using Component Video for connection, this is an EASY fix. The component video cables were installed in the wrong order. Make sure the cables are connected to the right colors as it is very easy to mistakenly cross the Green and Blue cables. Using a flashlight will help so you can see them easier. Don't forget to check that the cables are in the right order on your accessories, too! Hope this helps.