RGB to YUV converter vertical bending

I recently got a scart to yuv adapter, there are multiple problems I am having

1: There is vertical bending on both sides of the screen at the end

2: Some games have better colors then others, sonic 1 has a red tint, and I can't seem to fine toon it to be completely normal, then after tweaking with sonic 1 all the other games are messed up

3: There are VERY faint perfect vertical lines, but only slightly visible when there is red

Any solutions? Will getting a different power adapter help solve the issue rather then the stock one?

 

Whoops, double post

 

Is it an external SCART to Component converter? If so, it could be that the pots inside the converter need adjusting. I heard this was a problem with SCART to component converters. Using fully-shielded and fully-grounded SCART cables can fix the color bleeding.

If it is an internal board, check all solder connections and use high-quality RCA cables and see if the issue is still there.

Which model of the Genesis/Mega Drive are you using and what revision? The "High Definition Graphics" Model 1s (VA0-VA5) have rainbow banding. My Model 1 VA6 doesn't have that issue.

 

Double post deleted.

 

By SCART to YUV I presume you're converting RGB to YPbPr.

To help you more info about the converter, your SCART cable, and your display, is necessary... Fine tuning is an unusual control for a YPbPr converter as YPbPr is strictly formulated from RGB and doesn't need adjustment under normal circumstances. This gives me the impression you're using one of those recent "YPbPr mod" kits with potentiometers, in which case that would be your problem--they're terribly designed and don't seem to follow any industry guidelines whatsoever which would lead them to extreme non-linearities. If you're tuning your DISPLAY rather than the converter itself, ie you can somewhat compensate for the color, you probably have distortion from signal clipping but it will take more information to understand why.

"Vertical bending" sounds as though you're having a sync issue. If you have a "composite sync SCART cable" this is probably why. The composite sync signal doesn't have the right specifications to drive a TV, but was intended for an old generation of Japanese computer monitors.

Sync issues alone could cause color distortion because TVs may adjust the video signal level to match the sync level to the point of clipping or non-linearity, but this isn't particularly common for non-composite video.

It isn't possible for some games to have a tint problem and other games not to, unless the tint dynamically changes with the on-screen colors, which would be a very unusual symptom.

 

No, I WAS adjusting the potentiometers, but certain games I tried had different colors then others, so when I tried adjusting the colors to match those certain games (such as sonic one, the only game that seemed to have the problem ), other games would have messed up colors.

Yeah, I am using composite sync, guess I'll need to get a cyscync cable. I mentioned replacing the power supply because someone else said that from another post.

would It be better to get a real csy-2100 rather than the clone I have now?

The cable I got was a stereo cable from retrogamingcables.co.uk

 

Thanks

 

Are you using an HDTV? Some HDTVs don't properly support 240p from component. The worst affected sets point-blank refusing with an error message.

 

Yes, my tv detects 240p through component, I think I just need to get a raw sync scart cable to fix the issue. The red tint effect also appears in certain parts of other games, so I guess I need to open the box again and adjust the colors

 

Okay, so my csync snes cable came in, and there are perfect vertical lines present throughout the entire screen. The perfect vertical lines are also visible on the genesis, but are very faint. This is really starting to tick me off. Do I need to replace a resistor maybe?

 

Which model of the Genesis are you using? HD model ones have rainbow banding (rainbow-color vertical jailbars). Jailbars also exist on some model 2s so use a cable with boosted C-Sync. The Model 2 RGB SCART cable I use on my 32X has boosted sync and I have no jailbars on my SCART to HDMI converter. I got mine from retro_console_accessories on eBay.

 

I'm using a TMSS model 1

 

There are a few versions of the model 1 with TMSS. Does it say "High Definition Graphics" on the case? If so, it might be a VA5, the last of the HD model 1s.

If it isn't an HD model 1, check the back of the system. If it has all of the ports in the same place as early model 1s (except for the 9 pin modem port), it's a VA6 (same as mine). If the ports are moved to the left and not in the same spot as early model 1s, it's the dreaded VA7.

The VA0-VA5s have rainbow banding and the VA6-VA7s do not. VA7s have horrible sound quality.

 

Yes, it does say "high definition graphics" on the front, forgot to mention that

 

Then it might be a VA5. The jailbars are supposed to be there in the HD model 1s. A quick look online suggest that this is an issue with the video chip.

If you want to get rid of the rainbow banding, the simplest way is to use a 32X with a stereo patch cable and a Sega Genesis model 2 RGB SCART cable with boosted C-Sync. You could also try recapping the system.

Since the SNES has issues too, it must be the converter or your SCART cables. I'm just throwing ideas around since I don't know much about these RGBS to YUV/YPbPr converters.

 

A certain type of jailbars in RGB are fairly normal, at least when using composite video (CVBS) for sync. Master System has them too.
But rainbow banding with RGB? That is strange. Usually a by-product of the system's poor quality composite.

Try to compare with a CRT SDTV (or external video scaler) if possible. Your TV displaying an image from 240p component, doesn't mean it's being processed correctly.