Issue with GE "Portacolor III"

[Jeff]

Originally Posted by zeno

You may try lifting pin 12 & see if you get 1-2V P-P of video on the
pin. You could also try hooking in composite video at TP 6 from a DVD. Just
be sure to use isolation !

73 Zeno
LFOD !

Just for good measure, I replaced the IF amp IC again, this one was a completely different brand and seller, and it does the same thing. Pulled pin 12 and there was just a flat line all the way down to the 100mv range. The thing is, when I inject a composite video signal straight to the video amp, It basically does the same thing with it's color situation, but I just assumed this was because composite is only 1v pp and the circuit expects 2v pp.