Black Screen Video Problem, PLEASE HELP!!!

caligvla · Post by **caligvla** » Wed Jun 04, 2008 8:48 pm

I have a Namco Pac-Man 25th Anniversary Unit, built in 2007 with a Wells Garner 19” Monitor.

All my JAMMA PCBs work fine in this unit except 2;
Tenkomori Shooting (Namco system 12) &
Space Invaders ’95 (Taito F3)
on both of the PCBs, I get sound and a completely black screen…

I tested both of these PCBs in another cabinet at a local shop, they work fine…

I have tried adjusting the voltage on the +5 from 5.05 – 5.5, didn’t solve anything…

Any ideas out there? This one has really got me frustrated!

dpful · Post by **dpful** » Wed Jun 04, 2008 11:41 pm

Maybe the jamma harness is a little looser than others? The screen would come up if you wiggled or flexed the harness in this case.

I don't enough about monitors, but maybe this one has a very narrow range of detection and won't display outside the range? Anyone?

caligvla · Post by **caligvla** » Sat Jun 14, 2008 5:40 am

Well it seems the wells garner monitor was picky about the signal from some of the PCBs. I put in a Samsung Monitor and now all my boards work fine... Odd how the monitor would like one board but not another... The wells garner had a digital OSD and other advanced features the Samsung is pretty vanilla but seems to be working like champ. I usually shy away from Korean products but has anyone else had any experience with the Samsung standard monitors?

Post by **Dave_K.** » Sat Jun 14, 2008 10:23 pm

I'm not surprised. Analog control monitors (like Nanao) are more capable of handling different frequency/refresh rates than a digital monitors. For example, the Kortek (used by Betson and Happ) and NeoTec digital tri-sync monitors all have problems syncing with Cave SH2 boards, as well as a few other odd PCBs. The NeoTec won't even sync with a NeoGeo motherboard!

Hewitson · Post by **Hewitson** » Sun Jun 15, 2008 6:13 am

If thats true then the NeoTec is a heap of shit. Ironic name considering it doesn't work on the Neo.