Space Invaders Part 2 blue/greenish screen

Mr.Smiley

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I just hooked up a Taito Space Invaders Part II 3 layered PCB to my orig. Taito cocktail table. Everything seems to work fine, controls, sound and coin but the screen is blue/green like this:

http://www.mtekken.de/gc/bilder/spaceinvaders2.jpg

I have connected RGB, Sync and Video Ground. If i just connect one color with sync and ground it still looks the I also have to turn down the brightness of the monitor to almost minimum to see anything. If i turn it up, the screen goes white.

Besides RGB cables coming from the chassis i also have another red cable, so it is: RGB, red wire, black(=Video Ground) and white(=SYNC). Whats that extra red wire for?

I am using this pinout, could it be a problem with Video ground or am i missing something here? Monitor worked before with Moon Cresta.

http://arcarc.xmission.com/PDF_Dip_Switches_and_Pinouts/taitoinvaderpinout.pdf

Thanks!
 
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OK thanks, so just a video ground issue or overall ground?

Do i have to connect video ground (pin M) to the black wire coming from the chassis or just ground it like normal? I tried grounding it and then the screen showed some weird lines in the background (just tried it with b/w). Maybe that can be fixed with H hold?

Do you know what is that extra red wire coming from the chassis?
 
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