Zenith Advanced System 3 picture tube testing

[Kevin Kuehn]

Originally Posted by Zenith26kc20

make sure the screen control on the flyback is not too high. It can cause the tracking to get squirrelly if it is too high (look for retrace lines with the brightness and contrast at minimum. If you see retrace it is too high. If too low, it may not track the black and white properly.
Good job on the cap replacement! You are a patient person to dig all of the "fish oil" caps out! Don't you love the smell when you are unsoldering them?

Thanks!

Yes that smell is very nasty. Seems caustic in nature and I suspect it's not good to breath.

Turning up the screen(G2) control produces green retrace lines, advancing further and the screen washes out towards green. Possibly the horizontal shading(stripes) are the result of it attempting to blank the retrace lines under certain scene conditions?