RGB bypass Sega model 1 issue (help)

[hidden0]

So i started getting into RGB modding and consoles
Built the GBS ‘ made some cables so far i have made couple cables and just modded N64 with rgb bypass.

Trying to mod Sega Model 1 with RGB rgb bypass board colors seems fine but there is a sync issue ‘ I tried directly connecting the csync to the gbs sync also tried composite video with sync stripper with gbs’

Tried original csync from the sega pcb as well as from the rgb bypass board.
Nothing seems to work
Video and pics attached

https://imgur.com/a/AwbRp0M

Also tried composite as sync but it did not work (directly nor with sync stripper)

[Anapan]

I don't have a quick solution or fix, only shared problem. I had endless sync issues, and bought a lot of scart cables. in the end I recapped one of my model 1 genesisses and installed a triple bypass. Same guy you purchased from. My problem was probably bad caps. Before I recapped it I couldn't maintain sync.

[hidden0]

But totally bypassed it and the bypass pcb was assembled by me.

I am using gbs to check like i did with other rgb modded consoles.

[Ziggy]

Does that sync issue happen in all games? Or just in Sonic 2 split screen? I remember reading that some scalers have issue's with Sonic 2's split screen mode.

[hidden0]

Does that sync issue happen in all games? Or just in Sonic 2 split screen? I remember reading that some scalers have issue's with Sonic 2's split screen mode.

I just confirmed it is happening in all games
I think ill just try some other model 1 with the same scaler setup and see if there is something wrong with my mod or the sega itself.

Edit : so i tried the default sega model 1
With this rgb cable diagram still having this issue

https://imgur.com/a/CjkszoB

Based on this diagram

https://imgur.com/a/kZ1IlOZ

[hidden0]

Still got no luck getting a proper video .
Tried with rgb bypass and directly with rgb as well same sync issues on gbs.