I have a JVC 56" I'ART RPTV that is aprx. 4 yrs old. It now has a problem in the upper left corner. How can I fix it w/o going broke and?

My JVC 56" RPTV has a blue wedge in the upper left hand corner and for about 6" it has a 3D look to the picture. It seems as if the picture is sliding off the screen and then going 3D. I have read problems and think this could be convergence is this true? I ran the convergence test and everything lines up except in the left corner. Can you help?

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