I know that set. I worked on a few of them. EVERY one of those “pseudo flat panel” 30” or so “thin tube” sets had linearity problems. Many had voltage regulation problems, solvable by replacing one or 2 resistors in the B+ trim ckt. BUT the linearity problem was NOT really solvable, without a new yoke....and it my have been a “bonded yoke set”....meaning part of the CRT.
Yup the second one also had that voltage regulation problem.
The screen size would grow or shrink depending on the brightness of the picture.
in between commercials the screen would make weird undulations.
The first one was a floor model,seemed ok at the store I guess, I probably was blinded by the deal I was getting, TV’s were big $$$ back then.
I got home and plugged it in the pic was so bad I couldn’t believe it.
Every corner area was totally out of focus.
What a pos model.
I have a Panasonic 50 inch Plasma now, TV is pretty sweet.