Hello, I looked everywhere for your reply, I read it and then totally forgot in which thread it was in!
I even created a new thread to try and obtain the answer, here: Sony CRT TVs and Monitors "breathing" and brightness problem - which caps/parts to replace to fix it?
But I can just delete it and ask here: could you please elaborate on the procedure to solve the "breathing" and brightness issue on Sony CRTs? I have that same problem with a small 1999 Black Trinitron, I adjusted the brightness to mitigate the issue of distorted geometry and it worked, but I assume it will only get worse with age, and that servicing it is inevitable. How did you proceed to do the service? What parts/capacitors did you replace, if that's the case, and if it's the same between Trinitron Monitors and TVs? Many thanks for your help, glad I could finally find your reply!