Problem with CMVS Sync on Samsung Plasma but MVS works ok via Vogatek and other TV[SOLVED]

[brettster]

This is a bit of a weird one, I made a CMVS which has been working fine on my old TV and other tv's too via RGB Scart. I now have a new Samsung Plasma and the picture rolls, like a sync issue. I've read alot about sync issues but the weird thing is that if I connect the board up via a Vogatek supergun it works fine. So I would take that my TV can handle the Sync ok. MY TV also works fine with a AES via Scart too for what it's worth.
I've tried my CMVS on a host of other TV's which also work fine. so im a bit stumped now!

Anyone have any ideas?

 

[HeavyMachineGoob]

There's actually two ways you can get sync for your RGB, composite video or composite sync. Once you figure out which one your CMVS is using (probably C-sync), you might want to try the other to see if it makes any difference.

It could also be that Samsung Plasma is a piece of crud, much like everything Samsung makes.

 

[brettster]

your not wrong about Samsung !! Im not sure how to get the Composite video from an MVS board, all I can find is Sync which is connected to pin 20 on the RGB Scart.

 

[Xian Xi]

You can try putting a 0.1uf cap inline on the sync line. See if that helps.

 

[HeavyMachineGoob]

your not wrong about Samsung !! Im not sure how to get the Composite video from an MVS board, all I can find is Sync which is connected to pin 20 on the RGB Scart.

Oh fook, silly me. When I read "CMVS" I keep thinking there's an NTSC video encoder in there somewhere. Composite video is an NTSC thing, you won't find it in a RGB/SCART configuration. Technically C-sync is better than composite video, but some TVs are just plain weird and can work with comp video better than pure c-sync.

Try doing what Xian Xi suggested.

 

[fremen]

Hi,

You can try putting a 0.1uf cap inline on the sync line. See if that helps.

If this solution doesn't work, try to change the resistor in the sync line on your cmvs and put a resistor with the same or higher value than the vogatek sync resistor.

Un saludo

 

[brettster]

Thanks for the Help Guys, Fremen you win, I used the same Resistor as in the Vogatek and perfect 64" CMVS action

 

[Xian Xi]

Very nice. Any way you can adjust the overscan?

 

[fremen]

Hi,

I'm glad that you've solved it.

Un saludo

 

[brettster]

Thanks again
The TV can adjust the Overscan but only from the Service Menu, so no major problem.
Im a Happy Bunny