Another day, another Trinitron

[radiotvnut]

I hate to tell you; but, those symptoms are the sign of a weak CRT. Depending on how bad the tube is, you may be able to tweak the G2 control in order to stop it from blinking on and off. I have rejuvenated these tubes; but, they often don't hold up. They'll look good for a little while; then, they will fall back down again and usually look worse than before it was rejuvenated.