Only recap the sweep board & only the electrolytics. Also check
it real good for cold joints.
The big shielded board on the bottom is the digital board. Do not
mess with it unless you HAVE to.
RGB is probably TTL with sync on green. It prob goes to a switching
IC just before a D-A converter.
IIRC Sams covered this. Try to find a used ORIGINAL copy. sams
is too much $$ & often a poor quality. Originals are the highest Q.
OEM Zenith manuals suck at this time but they may have info on
the RGB input. They come on fiche that is a PIA to work with or
paper that came loose. Finding a truly complete paper one is HARD.
Training manuals are nice but I dont remember training on them.
May have just missed it. Watch e-bay for OEM. You will probably
need to find the manual number 1st. format is CM###
73 Zeno
LFOD !