Problems with my GBS-8200

[danbatalha]

Hello, guys.

Recently I bought a GBS-8200 for me, so I could do get a better quality video from my old videogames.

First of all, I bought some SCART cables on AliExpress. After this I build the sync stripper using LM1881 and did the proper mod to get SCART output from the GBS-8200.

I plugged everything in it's right place and turn my Super Famicom on. The picture looked really nice, but no matter what I try to do, I can't get the image to sync 100%.
I bought another LM1881, and still got the same problem. I tried to remove the sync stripper, and for my surprise I got the same image, but with the same problem.

I uploaded a video to YouTube to show you the problem:
https://youtu.be/vCc-UR8QE9o

As you can see, the upper area of the video is "shaking", and the bottom area too (but not so "strong").
I did a lot of searching on forums, YouTube, try to build the mod again, but I can't solve the problem. I don't know if my GBS-8200 has some problem, or maybe my cable.

Does anyone know what it could be?

EDIT: I think it's important to mention that all this tests I've been doing, I did with my Super Famicom (HVS-002) and a american Super Metroid cartridge.

PS: Sorry for the bad english, I did my best lol

[danbatalha]

Just a little update.

Today I decided to test with my Mega Drive III. It's a brazilian Sega Genesis, Mega Drive III, but the problem is worse on Sega MD.

I uploaded a small video showing the problem:
https://youtu.be/mNsiMeCSgNU

The image looks good, but it's not stable. I tried in 2 different screen: a PC monitor and a TV.

To make the SCART to VGA mod in my GBS-8200, I followed this schematic, but since my GBS-8200 came with the cables/connector (don't remember the name), I'm using it and plugin into RGBS input:


And the PSU, I'm using a universal PSU (1000mA), I tried with 4.5V, 6V; 7,5V; 9V and 12V, the results are always the same.

[gray117]

Take it you've 'auto' adjusted your screens when hooking them up to this new vga input?... If it's a slightly odd signal they may simply need to sync up a little different from normal.

Otherwise ooks like the sync might be a little weak... But that's just a guess... You could try putting the end signal (via right?) through an extender/booster (usually used if you were conducting a vga signal over 5m).

Otherwise perhaps something here will help:
Ihttps://ianstedman.wordpress.com/gbs-82xx-experiments/

[mvsfan]

Thats a lot of extra work for that.

You just need to get a sync stripper in a scart to VGA cable. It takes 15khz RGB over the Vga Input. I have mine hooked up that way.

[mvsfan]

have you switched the input to RGBS on the GBS ? if you have it on ypbpr it will still kinda work but the picture will not be stable.