If the s-video output of the source is ok (remember that only S-VHS has S-video (there is a single exception, out of millions of models), so any device that gets S-video out of a VHS deck actually tricks the capture), then it may be that either the cable is broken (one reason why S-video never made it to the studios) or the filters (which may be as little as ferrite pearls) are defective/bad/too aggressive.
There are lots of devices that yielded a better image with composite rather than with S-Video, in particular at conversions.
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Born in the USB (not USA)
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