Quote:
Originally Posted by Zenith6S321
As I rotate the H hold counter clockwise the image moves slightly to the left and the white vertical line moves to the right. So, I think it does what you described.
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Yes, definitely a sign of something in the video during retrace. Does the visibility increase when you turn the brightness up? Can you see the h sync then? This would mean there's insufficient retrace blanking. (Not familiar with this schematic, so don't know what provisions there may be for blanking.)