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Main => Monitor/Video Forum => Topic started by: Jack Burton on October 28, 2007, 09:29:07 am

Title: Do I Need ground when connecting JAMMA video to Data monitor?
Post by: Jack Burton on October 28, 2007, 09:29:07 am

I'm splicing BNC ends onto a JAMMA video cable and have noticed that there is a ground cable in addition to the RGBS signals.  Can I just leave this off or do I need to splice it into one of the other signals?

Title: Re: Do I Need ground when connecting JAMMA video to Data monitor?
Post by: Jack Burton on October 28, 2007, 11:50:15 am

Update:  I just finished splicing all my cables together and attempted to connect my monitor.  All I see are garbled graphics rolling up down the screen.

I have connected the RGBHV cables to the appropriate ports on  the back of the  monitor, but I still can't seem to get it to sync.  Tried twisting the cables together to make composite sync, had no effect.  Maybe I should try twisting it to the green signal and try to get sync on green?

Title: Re: Do I Need ground when connecting JAMMA video to Data monitor?
Post by: MonMotha on October 29, 2007, 03:28:21 am

The video ground line should be connected to the shield of the coax used to feed the BNC connectors, which will connect it to the outer shell of the connector.

For sync, the convention for PC type monitors is normally to apply composite sync only to the horizontal input, leaving the vertical input open.  Some monitors prefer to see it on both horizontal and vertical inputs, however.  If you have separate sync, just feed that straight to the monitor separately.

Title: Re: Do I Need ground when connecting JAMMA video to Data monitor?
Post by: Jack Burton on October 31, 2007, 07:19:25 pm

thanks a lot.

I figured out what my sync problem was.  When I stripped the ends of the cables I accidentally yanked one of the wires on the other end of the cable out of its socket.  Pushed it back in and it worked!