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I agree with you regarding that the idea of finding the source of the hum in the vertical side sounds silly, but I've spent days checking the horizontal side and no hum appears there, only on the vertical side. There is a very obvious, slow moving hum in the vertical side. It's counter intuitive, but true! That's why I reached out to the group to try to get some help trying to nail this fault. I' stumped. The fault displays itself as a slow weave from side to side, traveling up the screen, then repeats exactly in step with what I see on the scope. On the 21" screen, the movement is almost an inch of screen width.
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