Rival Schools PCB Board problem (JPN version) too much glare

[Rock Man]

Hi, my friend has a problem. I was wondering if you guys could help him as you helped me before. I let him type a message thinking you guys could help come up with a solution. Please aid him in anyway you can, thanks!

Message typed from my friend:

"I have a rival school jamma pcb board and it is not showing a clear picture. The picture has a bright white glare to it making it hard to see a picture. I have a supergun set up and my hyper neo-geo 64 works fine but my rival school arcade board has this problem. my supergun is hooked up to my rgb scart to HDMI converter which plays on my HDTV tv. All my other sytems works great on this converter excecpt this rival school arcade board. please help me in this situation thank you".

[jonny5]

turn down the contrast on the tv

[Rock Man]

Already tried that... no go.

Could it be maybe it takes a certain type of monitor resolution?

[neorichieb1971]

Could be anything from PSU power, a faulty video output chip, the conversion to your hdmi box.. just about anything really.

First thing i'd do is find someone local on here with a cabinet/supergun and try it there.

[undamned]

Some of the ZN hardware has uber high video gain. I had an Ehrghiez PCB that was like that. You may have to put resistance in series w/ each color signal (R/G/B) and drop that voltage down to a reasonable level.
-ud

[system11]

Yeah - sounds like you don't have RGB pulldown resistors on your supergun.

[Rock Man]

Would he need to change the frequency somehow? Since there are various monitor resolutions CGA, EGA, etc. I assume he'd need a converter (WHATEVA to VGA/HDMI) to switch those signals?

[undamned]

Nothing to do with frequency. Resistors must be used somewhere between the PCB and the HDMI converter. I couldn't tell you the easiest place to install them, but that's what needs done.
-ud

[ZOM]

does his supergun have pots to turn down that R,G & B gain? If no then, well, there you have it.

[Rock Man]

does his supergun have pots to turn down that R,G & B gain? If no then, well, there you have it.

Nope, I'm afraid it doesn't offer RGB gain switch. =( Good guess though.

Nothing to do with frequency. Resistors must be used somewhere between the PCB and the HDMI converter. I couldn't tell you the easiest place to install them, but that's what needs done.
-ud

Sounds like useful advice to getting that thing to display on a Coosis converter. But right now I believe he's trying to stay focused on how to tone down the brightness. He can get it to display fine on the YUV converter, his Hyper Neo Geo 64 games output correctly, Rival Schools is the odd ball out of the bunch.

Say, exactly what monitor resolution is the game running on anyway CGA, VGA, or EGA?

[jonny5]

does his supergun have pots to turn down that R,G & B gain? If no then, well, there you have it.

Nope, I'm afraid it doesn't offer RGB gain switch. =( Good guess though.

Nothing to do with frequency. Resistors must be used somewhere between the PCB and the HDMI converter. I couldn't tell you the easiest place to install them, but that's what needs done.
-ud

Sounds like useful advice to getting that thing to display on a Coosis converter. But right now I believe he's trying to stay focused on how to tone down the brightness. He can get it to display fine on the YUV converter, his Hyper Neo Geo 64 games output correctly, Rival Schools is the odd ball out of the bunch.

Say, exactly what monitor resolution is the game running on anyway CGA, VGA, or EGA?

cga

[undamned]

Nothing to do with frequency. Resistors must be used somewhere between the PCB and the HDMI converter. I couldn't tell you the easiest place to install them, but that's what needs done.
-ud

Sounds like useful advice to getting that thing to display on a Coosis converter. But right now I believe he's trying to stay focused on how to tone down the brightness.

It's useful advice without a converter The only reason I mentioned a converter was because you said that was his setup. Resistance can be added right after the PCB before it hits a monitor/converter/whatever.
-ud

[P-man]

erm..

Don't these pcbs have an RGB gain setting screen in the test mode? I have found that if the pcb has fogotten all its settings it will screw the RGB gains to max showing what you describe.

Go into test mode and look for the RGB settings...

[undamned]

erm..

Don't these pcbs have an RGB gain setting screen in the test mode? I have found that if the pcb has fogotten all its settings it will screw the RGB gains to max showing what you describe.

Go into test mode and look for the RGB settings...

I recall dorking with that and the picture, although less bright, still looked funny.
-ud