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If your TV picture doesn't look right, the first thing to do is to check all the connections and cables that are bringing signals to the screen. Replace any loose or frayed cables, and make sure cables are stowed out of the way of pets and children.
It's also possible, especially if you didn't buy a name-brand TV, that your television manufacturer provided shoddy cables. Try installing a quality brand of cable and see if your signal improves. Cables are one of the few big-screen TV parts you can replace yourself.