I can try this tonight.If you're feeling like experimenting, try connecting each of the RGB signals before its coupling capacitor (yellow thing) on the NESRGB board. It's possible that one of them is bad. It can run without them temporarily, but its not safe to run it like this for long periods of time as the video encoder will overheat.
I am using 8 pin mini din to SCART from RCA with the coax upgrade with the hopes that it would fix this problem.Did you try a different pair of RGB SCART cables? I saw this before she using cheap cables that were not correctly made.
Using OEM power supply, I only have one to test with though.Another idea is the power supply. Are you using original nintendo do power supply or some cheap switching power supply that adds noise ??
Same cable but it is coax upgradedIs your audio running separately or in the same cable?
I will tonight.post pics of install job.
I haven't opened the cable up personally, but RCA told me that this particular cable has no passive components on the video lines. I can check tonight.If you've got caps in the cable, try without them. The NESRGB already has 220uF caps in the output chain. This looks like a DC offset from a line carrying into H-blank, which is slightly affecting your clamping values.
Both the Garfield and Super Mario Bros pictures look this way.
With my install I skipped the external reg, also I've replaced the 7805 with one that can handle more current (1.5A I think?) as I also use a PowerPak.The only thing I would have done differently is skip the external power regulator.
I'm willing to try whatever to try and fix this problem, I know we should be able to track it down.
Here is another clip in SMB2 that really shows an extreme example of this ghosting effect.
https://clips.twitch.tv/HumbleZealousAr ... WholeWheat
I also have access to a (cheap) oscilloscope for a few days if anyone wants me to take any measurements.