Hitachi 50+in rear projection tv

If you mean that the 3 colors (reg, green and blue) suddenly no longer line up properly in one area of the screen, it means that one of your convergence IC's has burned out and needs to be replaced. There is no adjustment that will correct the picture in this case. When I do a housecall to replace a burned out convergence IC and realign the convergence circuits, I charge $150 but shops in your area will vary so be sure to ask around.