have a Sony KPS53s4U.. it has started showing blue edges on the rright side of the screen, I pulled up the menu and looked at the convergane, the blue was out to the right and more at the botton of the cross, I then went to adjust this and it would not move, the red will go up and down and left and right, the blue will go up and down, but it wont move left or right from the remote. the tv is 4 years old, what could make this happern, only on the blue, I think if someone reads this thay may be able to pinpoint this problem. or how much, good service place Essex? Please reply. Dave :-?