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@bigfatmonk, the problem I am referring to is actually not a problem with sync per se, but with high-frequency color information on the composite video line coupling into color information in the R, G and B lines, causing a visible, unwanted cross-hatch pattern. The first post of this thread has an image demonstrating the effect.
The effect happens when composite video is used for sync, the wires within the cable are not sufficiently shielded and there either is no sync stripper or it is in the SCART plug end of the cable. If a sync stripper is used, it should be in the console end of the cable to avoid the cross-hatch pattern for the simple reason that the R, G and B lines are less exposed to the electromagnetic radiation from the high-frequency composite color information.
Or at least that’s my understanding of the issue. Hopefully this was of help to you.