WG K7500 strange color bleeding

[techn0]

I have been getting dead k7500s for free or cheap lately and have been having quite a bit of fun getting them running again.  I have one that I am working on now that is doing something new to me.  I get the picture adjusted to the correct size.  I position the brightness adjustment to center and then I try and adjust the flyback for correct brightness.  Well when I adjust to where I think it should be the colors drift tremendously ruining the picture.  I will post pictures when I get a chance.

Thanks

Oh and yes it has been recently capped.