When the signal is in black and white, the color is right except for
the upper right corner. When I use my VCR to inject a blue raster,
the picture in the lower left half of the screen is blue, the rest
(except far upper right) is green. I think this is convergence, but I
don't know where the convergence magnets are. Is it convergence? If
so where are the magnets? If not, what do I need to adjust?