I'm modifying an old CRT to take NTSC composite input (it only accepts RF over coax.)
I have got a good signal going in but it has this weird distortion going on.
When the image is dark the pixels may shift left. When the image is bright the pixels may shift right.
How might I go about fixing something like this?
I've tried raising and lowering the capacitance in series with the signal input, no change.
The convex from the bright image is much less noticeable, but the the dim image is very noticeable.
EDIT: UPDATED VIDEO TO SHOW DISTORTION BETTER. Far worse than it may seem from those images. https://i.imgur.com/NOXu49r.mp4
This image shows what I mean:
The RF demodulator outputs a composite signal to pin 13 of the video processing "jungle" chip. I lifted this pin out of the circuit board and then soldered a composite wire to it through a 1uF ceramic capacitor. Before the capacitor I connected a parallel 75 ohm resistor to ground. Look below for some schematics of the TV.
"Jungle" chip datasheet
TV Service Manual (My specific model is the PR1305C1, sometimes written as PR1305C121)