2-slot picture "rolling"

[sylphia]

Hi,
I've recently acquired a LG LCD (RZ-20LA70 model) which I try to use with my consolized 2 slot MVS system, connecting them through a RGB scart.
Unfortunately, as can be seen from the following video, the picture keeps rolling horizontally.
Does anyone have any clue on what is going on ?

Let me add that this slot works well on a CRT TV which I can't use anymore...

Any help greatly appreciated.

http://dl.free.fr/ulFaIa2Pj/P1000504.MOV

 

[Hewitson]

Unfortunately some LCD's and Plasma's don't like the slightly out-of-spec vertical refresh rate of the Neo Geo. The only thing I can suggest trying is a JROK Sync Cleaner.

 

[Xian Xi]

The sync cleaner will not alter the refresh rate just clean it up.

 

[sylphia]

thanks for the prompt answers.
Sorry if this sounds stupid but isn't 60Hz the vertical refresh rate ?
How can it generate an horizontal picture rolling ?

 

[Xian Xi]

No it's not exactly 60hz, the Neo's Hsync is around 59.18hz, NTSC standard is 59.94hz. Most TV will dip above and below the 59.94 but some are pretty strict.

SNKNostalgia said he used a .01uf ceramic cap on the sync line and it helped the picture, you can give that a try.

 

[sylphia]

thanks for the tip. I will try it as soon as possible.