Check convergence output ICs in your tv, these are big black ICs mounted with aluminum heat sink, in my opinion, pins of these IC got cold solder joint in circuit board, re-soldering IC pins will fix your tv problem.
I do not agree with other expert solution so be aware.
Color arching.... Ahhh Yeah they eventually do that after a few years. Good news is all you need is a screw driver and some of your time and patience.
The color gun is a small box with 3 screws on it. (Blue, Red and Green. Turning the screws (Slightly) on the gun will get rid of the color arching. I had blue arching on a sony 65" Rear projection a year later it was red arching if you leave it long enough it will be arching and in and out flashing of solid color. Whole mind trip you don't want to venture on.......
The box on my sony was in the very front of the tv. I removed the front speaker panels and accessed it very easily. The hardest part is getting the front panel off. Yours may be in the back.
Best regards and Semper Fi...
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