my convergence was adjusted by the tv putting a white crosshair on the corners of the screen, the middle sides, and the center. you would match blue and red crosshairs with the white one manually with the remote.
look for service records or consumer reports for service records or even call the local tv repairman and see what he fixes alot of big screen repair is very expensive
thats what i had I had to replace the convergance board that controls the guns 2 times at $800 a pop first time covered by warranty the 2nd not. and it did again so i threw it out. im looking at hitachi lcd 60'' for about $3000