convergance output failure replace output ic usualy an stk amp ic they are cheep you could get extreamly lucky and the picture could come back to normal but most likly it will need alighnment(convergance) to fully restore the picture. take it to a tech if it is the old style convergance board with 50 to 100 adjustment potentiometers or if you have no schematic diagram, digital convergance is much easier to get right.
