J-PAC Dim monitor problem

[superpretendo]

Hello all, I have a bit of a problem with my current Egret 2 setup. I currently run an Xbox 360 through an Ultracade UVC (Hooled up to a Jamma edge connector made by FrancoB) that works perfectly. I purchased an J-PAC device in order to pass through control to the 360, but when I place the j-PAC onto the JAMMA connector, the picture on the monitor (Nanao MS9) goes very dim and flickers. Once I remove the I-Pac, the picture returns to normal. Has anyone experienced this problem before? Or does anyone know what may be causing this? Thanks guys!

[antron]

Does your uvc adapter have a jamma passthough?
So:
Jpac->homemade uvc adapter->cab

If so it sounds like both are trying to drive the video. Could be current draw but I don't think the Jpac draws current from the jamma edge.

[superpretendo]

That's kind of what I thought, since that device is traditionally used for connecting VGA cards and not controls alone. Would there be a way I could just... cover the unused video pins on the card? Or sever the contacts?

[emphatic]

I had the same exact issue. I solved it by taping the RGBS pins on the J-Pac with clear Scotch tape. The J-Pac sends out some kind of blanking signal when no video source connected, that interferes with the UVC.

[superpretendo]

Emphatic, this fixed the problem perfectly. Thanks so much for everyone's help and suggestions, much appreciated! I was worried i'd have to bust out the soldering iron and do a brand new padhack!