Naomi Black Screen on Vewlix F

[jugu]

I posted this on the shmups forum but figure I'd ask here as well. When I connect the Naomi to the VGA cable of the Vewlix, all I see is a black screen. I'm hoping someone has some suggestion as to how to resolve my problem. I've verified the following:
* Dip switches set correctly to 31khz
* Voltage: 12v, 3.3, 5v, have all been adjusted and are set accordingly
* Power: The Naomi motherboard powers up, fan and led lights are on

I've tried the following:
Naomi -- VGA --> Vewlix = Black Screen
Naomi -- VGA --> XRGB-3 -- VGA --> Vewlix = Black Screen

Now I don't have a Naomi game to try it with at the moment, just the motherboard. However, I have a Naomi2 motherboard that I can boot without a game and get to the service menu successfully on the same Vewlix.

Is the black screen expected when booting with out a game? Anything else I can try?

Thank you.

 

[jassin000]

Naomi should give you a "Error 01" message without a cart/DIMM installed.

Just like this screen.

If you can't see anything, I suspect something is up with the Naomi motherboard.
Do you have another VGA monitor to test it with?

* Dip switches set correctly to 31khz

This should be all switches set to off position.

 

[jugu]

Just tried with a Dell 19" LCD monitor and a Sony TV. Same black screen.

Yes all the dips switches are on down position.

Thanks for verifying the behavior with no game installed.

 

[jassin000]

Ouch, sorry jugu pal... I'd say that mobo has issues.
The same black screen on the other two monitors is a sure sign of it.