Have an M20M4 hooked up with RGB SCART which works ok on another pvm, but is showing a problem with the bias for red and blue, they have to be at nearly max setting to display the darkest areas (almost at 2 on 240p test suite). Green is fine and gives a green tint if run too hot as expected. It’s like something is pulling darkest elements out of red and blue.
When powered on it does initially seem like red and blue are stronger but they appear to fade over 10mins slightly while the green is darker and gets brighter.
I’ve been replacing caps and hooking it back up, but so far haven’t got to any that will resolve it. I did switch red and green inputs to the neck card and red was showing a full color bar, so the tube is ok I believe. I also tried another input board and nothing changed. The gain settings work as expected just appears to be bias.
Any suggestions would be really helpful!