PS One screen and Arcade Neo-Geo Vertical hold problem

uriahsky · Post by **uriahsky** » Thu Jan 11, 2007 2:43 am

I operate coin-op games and when I saw that Ben had used a PS1 LCD screen for a Arcade Neo-Geo I had to have one for my test bench so that I don't have to lug CRT monitors around. So I wired one up. (I have Ben's book on order) I found the pin outs on the web. The picture comes up but I don't have a sold sync. I get a slight roll every second. Kind of like when the vertical hold is not set right on a crt. Only thing is there is no vertical hold on these things?? Or is there?? Anyone have any clues on how to fix this problem. I have three screens and they all do the same and of course a number of arcade boards and they all of the same rolling problem with the PS1 screen. Help please!!
Thanks
Uriah

Krepticor · Post by **Krepticor** » Thu Jan 11, 2007 9:36 am

ok what are you using for the inputs and the power supply?

it sounds like there is something funny with the C-sync or the poer supply providing "Brown" voltages (brown is a drop in voltage usually associated with "brown-outs")

uriahsky · Post by **uriahsky** » Thu Jan 11, 2007 8:02 pm

I am usng a variable powersupply set at 7.8volts DC. I adjusted the voltage up and down a little and it didn't make a difference. I am using the following to wire into the PS1 screen.
Green to pin 12 on the male input
Red to pin 11
Blue to to pin 9
Ground to pin 8
Sync to pin 5.

I have tried pin 6 as sync and pin 7 as sync.
JAMMA doesn't have a 7.5 volts DC so I can't pull that directly off the JAMMA Harness. I don't have Ben's wiring diagram for this because the book I ordered was out of stock and I just ordered another one from Amazon yesterday so it will be a few days. I guess Ben has been pretty busy and hasn't had a chance to answer my emails to him. Any other ideas? Anyone?? please.

Thanks
Uriah