Take back off tv and look for a connection that the screen hooks to and check and make sure it is tight in place and so on with the rest off the hook ups connections,or you can turn tv on and play something that has a dark background and take a piece of cloth an put it on the end of a pen or pencil and tap lightly or if needed a bit more on the red pixel's cause sometimes more than likely the pixel's are just stuck...hope this helps you out
