Higher impedence one one of the two processing channels?
The problem appears restricted to only some units. Mine has never produced split video. I recall many others trying to isolate the problem determining that most US models didn't seem to suffer from this flaw, so I'm rather certain this is limited to only some units.
I suspect this dual brightness may be explained by the dual imaging processors. If each were charged with recording half the video, and one was experiencing greater signal impedence, say from a bad solder joint or connector, it would be processing based on reduced input. One would naturally expect the video for that channel to be darker. If this theory is correct, it would explain why some say the problem is severe and others don't appear to suffer from it at all.
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