1968 Motorola works in a drawer

[maxhifi]

Originally Posted by DavGoodlin

Its been a while since Ive had a problem like this but it IS similar to how mine would behave under high-contrast and never happened with green IIRC. My 25V-crt was good and balanced but not like new.

So, it may be a CRT fault that is bore out by how fast the blue and red need to cut off. The white parts of the picture occur when all three CRT grids are as positive, and cathodes as negative as they get. It is probably not a demodulator issue, but its after that stage is the R-Y and B-Y possibly "ringing " as opposed to switching. In bit parlance, it needs to be de-bounced.

One book that may offer insight is the Tab Book - Motorola Color Service Manual by Forest H Belt. Ill check and see if this is discussed...

Thank you! I need to check eBay for that book! Also, I can add a bit more information now. The G1 voltage is derived from a voltage divider off 230V B+, with a 27k resistor in series with a 10k resistor. I woke up this morning and decided I had to check G1 voltage, and It is 0V. The 27k resistor must be open. Not sure how this is related to other problems, but I can't imagine it helps the CRT to work properly. Will try a new resistor after work (no time for working on TVs this morning!)