Nanao MS2930 15khz oddity via VGA

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imjasonmh
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Nanao MS2930 15khz oddity via VGA

Post by imjasonmh » March 15th, 2012, 3:38 am

I have just picked up an arcadevga card to use in my Blast City and have been having problems with the monitor. The monitor goes out if the screen is mostly white. I do not have this problem if I run in 31khz mode. Has anybody else experienced this problem? It does this when using my RADEON 4670 card with calamity's hacked drivers running in 15khz as well. If I turn the contrast way down, I am able to play a game with pretty much no interuptions. But if i turn it up just a bit, it doesn't take long and the picture is gone. If i turn the machine off, then on, it is back to working. But usually for only a few seconds. If I switch to 31khz, it works all day long. No problems at all. Can anybody help?? :crazy:

jason

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Re: Nanao MS2930 15khz oddity via VGA

Post by ikaruga007 » March 15th, 2012, 10:50 am

Is the 15khz image brighter than 31khz? Sounds like the video voltage is too high for the VGA port, which normally expects 0.7V. Not familiar with 2930, is there a resistance switch or something similar?

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Re: Nanao MS2930 15khz oddity via VGA

Post by imjasonmh » March 15th, 2012, 1:16 pm

It is actually a little darker. Which is why I turned the contrast up a little. Its not even at 50 percent. The HD 4670 is connected to the VGA cable with a dvi to vga adapter. I don't think that is an issue, because it does it with the ArcadeVGA card connected straight into VGA. There is a setup screen for a front end that i use that makes the monitor shut off instantly. The background for it is completely white. It wasn't shutting off when I had a game running in MAME up until yesterday. Can it be that only part of my chassis is going bad? 31khz works perfectly fine, from what I can tell. The 15khz problem would show up within minutes, but when I switch to 31khz...it goes away. :wtf:

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Re: Nanao MS2930 15khz oddity via VGA

Post by imjasonmh » March 16th, 2012, 4:24 pm

Anyone, anyone?

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Re: Nanao MS2930 15khz oddity via VGA

Post by ikaruga007 » March 16th, 2012, 5:12 pm

Can you try it with a jamma game? So you can find out if the problem is universally for 15khz or just via VGA from your PC.

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Re: Nanao MS2930 15khz oddity via VGA

Post by imjasonmh » March 16th, 2012, 10:50 pm

Solved. Wasn't turning on "dsub" dip switch. Everything is better now. Thanks for your help and time.

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Re: Nanao MS2930 15khz oddity via VGA

Post by ikaruga007 » March 17th, 2012, 12:55 am

Glad to hear it. :thumbup:

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Re: Nanao MS2930 15khz oddity via VGA

Post by rcaido » November 15th, 2012, 10:49 am

imjasonmh wrote:Solved. Wasn't turning on "dsub" dip switch. Everything is better now. Thanks for your help and time.
Where is the dsub switch?

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