(Topic ID: 139037)

Pin2k - no video - suspect prism card


By ChadTower

4 years ago



Topic Stats

  • 6 posts
  • 5 Pinsiders participating
  • Latest reply 4 years ago by dpqrm
  • Topic is favorited by 1 Pinsider

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#1 4 years ago

Okay, same issue others have had, but I'm not finding a lot of prism specific details on the net. I have Googled hard and Googled deep.

I have a Pin2k that has been rock solid reliable for years. Been running SWE1 for two years or so converted from RFM. Known good ROMs, etc. Stock computer and using a later model WG CRT. Occasionally the PC would fail to boot when the game was turned on (with fluo lit) and I'd have to fiddle with the PC's AT switch. That was a known issue for years.

Recently the video just flat out died. I saw no neck glow on the CRT at all, and since the CRT was a bit hacky and I hate working on them, I decided this was a good time to convert to LCD. I picked up a sync adapter dongle produced by a reputable Pinside member and paired it with the usual GBS-8220. I powered the GBS and the adapter off of a PCI USB card in the PC. Then I added the one known compatible network card and around that time the video stopped working. I measured power at the adapter at around 4.9v so I figured the power supply just wasn't cutting it for all of that added load. I replaced the power supply and removed the USB card switching to wall warts plugged into the wall for the adapter and GBS for testing purposes. Clean 5v to both, network card out, USB card out, no video.

The game does fully boot and is playable but there is no video coming through the GBS. It stays on No Signal. I can get into the menus just fine on the GBS.

This is where I start debugging. I started by replacing the power supply with a brand new AT because I don't know if that had ever been done. I pulled the prism card and booted to VGA. I can see the machine POST through the RAM test right up to the "no boot device" error. The motherboard looks good.

When I try to boot with the prism card in to the VGA I get the "out of sync" error you would expect. Still, I get no video through the adapter+converter so I have no idea what it's actually putting out. I have not yet replaced the motherboard 2032 or the prism card's battery but I'd be shocked if that made a difference.

There is an LED on the prism card. It appears to come on solid for the boot sequence and then starts blinking at a constant rate. No pattern to the blinking. I have Googled hard to find info on that LED's purpose and can't find anything. Is that a clue here?

Does anyone have any advice? I do have a WG arcade drop in LCD I could try to eliminate the conversion factor. I'm not sure if I would need to mod the original video cable, though. I'd have to look at the pinouts.

#2 4 years ago

Sync card Maybe

#3 4 years ago

If you want to try swapping parts someone has some stuff for sale in this thread.

https://pinside.com/pinball/forum/topic/school-me-on-all-things-pin-2k

#4 4 years ago

Too much..... lets try the typical troubleshooting steps.

1) start by removing the network card you installed (leave it out until you have the machine working again).
2) try moving the prism card to the other slot on the motherboard
3) try the WG arcade LCD (just plug in and set on the glass, dont bother installing)

Im 100% sure the batteries do not prevent boot-up.

#5 4 years ago

Heh, yeah, I did put a lot of info.

#1 and #2 didn't change anything. I tried those but it's probably lost in that manifesto I posted above.

I haven't sat down to interpret the video cable pinout yet so I can ensure the cable matches what the WG LCD expects. That will be one of my next steps. I don't want to test with that monitor without being sure any bad image is the result of bad video and not a mismatched cable.

Quoted from lurch:

Too much..... lets try the typical troubleshooting steps.
1) start by removing the network card you installed (leave it out until you have the machine working again).
2) try moving the prism card to the other slot on the motherboard
3) try the WG arcade LCD (just plug in and set on the glass, dont bother installing)
Im 100% sure the batteries do not prevent boot-up.

#6 4 years ago

If it makes you feel any better I am havin the same problem (no video and same flashing prism led) with one I am working on. I would be happy if I could just find out what the led indicates but can find nothing on the Internet on the led at all.

DAM

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