Help with weird Arcade RGB>>SCART Issue.....

[merchant]

As the title says i have an issue with my setup....

I'm trying to wirer my arcades RGB to a TV SCART socket. The TV works fine, can play various things on it through the SCART connections.

Here's where i am at.

These are what i have the arcades lines wired to on the scart socket.

Video Blue >> Pin 7
Video Green >> Pin 11
Video Red >> Pin 15
Video Synch >> Pin 20 (comp vid/synch in)
Video Ground >> Pin 17

AFAIK, this is how it should be hooked up. Well here is what happens. I get a pictured displayed on the screen that is a very dark grey/black colour. I can see the game running, the synch is fine, no rolling at all. The pictures on the screen have this white outline around them. So basically its a dark coloured screen with some whiteish outlined pics on the screen. However there is one really weird thing. When i go into the TV setup menu using the remote control (picture setup/sound setup etc etc) It shows up in a little box in the middle of the screen, usually the background colour of the menu is a greenish colour. When i open this menu while the game is running, i can see the game being displayed correctly in full colour behind the box!!! It is a little out on the colours because the background of the menu is transparent, so it sort of effects the colouring a bit, but otherwise it's perfectly displaying. The rest of the screen is still the dark blackish colour, and when i close the menu the whole screen is blackish again.....

I have no clue as to what is causing this....why is the video showing properly when the menu is overlayed in front of the picture? Any help is GREATLY appreciated

[NFG]

Basically your TV is set to composite video or Svideo mode, and is reading the Sync line (which typically includes some brightness detail, hence the B/W image you're seeing). 

You'll need to add 12V to the blanking line (via resistor as per the SCART spec) to tell the TV to switch to RGB mode.

[merchant]

Thanks for the info Lawrence, i've been reading and reading trying to find out what it might be

So would it be ok to just connect 12v from my arcade power supply to this line. A constant 12v power feed?

Thanks again for the info.