Does it happen with all inputs?
The most common problem I have found with this type of problem is a component cable coming loose from the television or cable or satelite box. If this is the case you can check by turning on the DVD and see if it has the same problem.
If only one input has this problem and the input devices work well with the other inputs, then, the problem would be in the main board.
Check the tint, is it centered? It should be.
With the color turned down is there a good black and white picture (Does the set have a good gray scale)?
These are the questions that my shop use to identify the source of the problem before we schedule a service call.
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