Ibara pcb acting funny

KBZ · Post by **KBZ** » Fri Apr 24, 2009 6:32 pm

Not sure what the problem is here.

Had this Ibara pcb for a while now and all of a sudden I notice the screen would go a bit dark randomly, and then suddenly really dark until I can just barely see the bullets.

any ideas?

lilmanjs · Post by **lilmanjs** » Fri Apr 24, 2009 7:23 pm

is this happening with only this pcb?

KBZ · Post by **KBZ** » Fri Apr 24, 2009 7:36 pm

this is actually my only pcb =/

neorichieb1971 · Post by **neorichieb1971** » Fri Apr 24, 2009 8:16 pm

Sounds more like the setup than the PCB to me. The PCB has set default brightness and contrast etc, its more likely a capacitor or resistor in your SG or cabinet.

KBZ · Post by **KBZ** » Fri Apr 24, 2009 8:36 pm

thanks

I have a sg that uses a svideo jrok. my arcade psu is still showing the green light to indicate that the voltage is perfect so maybe it's the jrok?

KBZ · Post by **KBZ** » Mon Apr 27, 2009 5:14 am

the setup is now not displaying anything.

voltage under load at the board was 4.85 voltage under load at the jrok was 5.11

adjusting the jrok or the board to 5.0 didn't change anything and every other system still works fine through the monitor =/

I haven't seen this happen before, although I remember iatneh's ketsui board not displaying though my sg while ibara worked fine.

not sure what's up here =/

iatneH · Post by **iatneH** » Mon Apr 27, 2009 5:35 am

...Check for loose wires?

KBZ · Post by **KBZ** » Mon Apr 27, 2009 5:46 am

hope it's just that. I'll try rewiring the thing tomorrow

KBZ · Post by **KBZ** » Tue Apr 28, 2009 6:11 am

found a bent pin on my svideo jack. Replaced with a new chasis jack and everything looks good.

thanks guys.

8 1/2 · Post by **8 1/2** » Tue Apr 28, 2009 7:45 am

Good find. That's not an easy thing to spot sometimes when you're already fearing the worst.

jonny5 · Post by **jonny5** » Tue Apr 28, 2009 12:18 pm

Kingbuzzo wrote:found a bent pin on my svideo jack. Replaced with a new chasis jack and everything looks good.

thanks guys.

you are running through a PVM right? it can handle a 15khz signal right?

why not just wire your SG for RGB and avoid encoders all together?

KBZ · Post by **KBZ** » Tue Apr 28, 2009 4:54 pm

the rgb input seems to be busted on this PVM. I have another PVM with working RGB but I can't be arsed to open it up and set the geometry.

I think it was being fed a bit more than +5v from my first supergun build and something was blown. Probably needs a new capacitor or something.

Even so, I've done side by side comparisons with the rgb and svideo on these monitors and I just can not see any difference whatsoever.

the sivdeo on one of my other monitors however, looks like shit compared to the component feeds. So go figure.

iatneH · Post by **iatneH** » Tue Apr 28, 2009 5:29 pm

The most noticeable difference for S-video vs. RGB should be on red objects with sharp borders, at least that is where it is more noticeable for me, but only if I am looking for it. And that is on still screens too. If things are moving around, then my attention is occupied by other things.

FLAC vs. 192 kbps mp3 on the other hand...... I cannot tell the difference

Anyway, good catch. Hasn't that gun been rebuilt/rewired a dozen times already?

KBZ · Post by **KBZ** » Tue Apr 28, 2009 5:44 pm

iatneH wrote:The most noticeable difference for S-video vs. RGB should be on red objects with sharp borders, at least that is where it is more noticeable for me, but only if I am looking for it. And that is on still screens too. If things are moving around, then my attention is occupied by other things.

FLAC vs. 192 kbps mp3 on the other hand...... I cannot tell the difference

Anyway, good catch. Hasn't that gun been rebuilt/rewired a dozen times already?

are you kidding me? Flac and 192mp3 is like night and day! Ok, maybe dusk and day, but I can tell the difference though my iems if I'm familiar with the track.

and yeah this SG has been rebuilt in many different forms with several different PSUs.