Dear Person:
I have an RCA P46731AT with a PTK169pga board..The pix is curved on both sides (inward)...There is a small board mounted by the flyback that has 3 adjustments on it...
One is "Horiz Width" & it works perfectly...
The 2nd is "Horiz Phase / Trap" that gives little effect...
The 3rd is the "Pin Amp Adjust" (R-4805) that has NO effect...
There are only 2 lytic caps on that board & I've checked them ( ESR & value)...Both checked OK...
I do NOT have the exact schematic & badly need one...