Quote:
Originally Posted by vts1134
What do you mean by this?
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As oldcoot88 said, hum bars are those dark horizontal bars that run upward or downward in your video. I now notice that they seem to change direction during the time recognizable video is on the screen. This should not happen if the video vertical rate is stable and the hum bars come from the power supply (AC line). What is your video source? Could it be accelerating up to speed? It just seems weird.
You also have white retrace lines, which have to do with CRT vertical retrace blanking (or lack thereof) and maybe copy protection on the video source.
So, again, the thing to do is to set the video level correctly to get a stable picture, and then chase the interference issues.