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Please check to see if you feel any vibration by placing your hand on top of the TV as it powers up. If you do there is a good chance the color wheel is starting to act up. Usually it's lamp failing first then the ballast and the color wheel usually soon after. The thing is these are consumable parts that eventually will need replacing. I would recommend calling Discount -Merchant as they will likely carry a color wheel for your TV at a reasonable price.
If you use a different input or say you only have a antenna connected does it do the same thing ? Trying to determine if maybe it could be a faulty digital video board. Please advise.