(Topic ID: 207098)

System 3 Stargate garbage dmd and beeps on boot


By Edenecho

2 years ago



Topic Stats

  • 7 posts
  • 5 Pinsiders participating
  • Latest reply 2 years ago by Edenecho
  • Topic is favorited by 1 Pinsider

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#1 2 years ago

Hello fellow pinheads!
Thought Id make a thread here even though this is a rather standard issue on system3.
First, I have read through Clays system3 pinball repair site, watched some videos etc, but Ill describe my issue and maybe some of you have some tips also.

Last week I picked up a stargate. Before packing it together, the former owner powered it on, it booted fine.
Arriving with the game at its destination, I set it up,connected its power chord to a power strip and when I booted it, it was only the typical garbage on the display. No sound.

Today, I powered it on and it was garbled display for a second and then it booted as it should. Turned it off, then on again and then it was stuck with the garbled display again.

Troubleshooting time:
1. I measured the 5v, trimming the pot up to 5.15, and down to 4.8 but it did not make the cpu board suddenly boot, still stuck in garbage land.
2. Turned off game, reseated all connector. Booted, still garbage dmd but now we had sound!! A constant BEEP BEEP BEEP BEEP.
3. We measured the battery, it was good but we still replaced it with a new socket and battery. Still the same garbage display.
4. We reseated all the ROMS, no change.
5. It seems the only thing left, according to pinball ninja, is to update the firmware to the latest .4 or .5, as this was supposedly containing a fix to this issue?
The current game eprom does not have the #version number printed on, so dont know if its .2,.3 or later.

Any other ideas to try, could the culprit be something else?
It seems as the game is booting okay the first time, aka when its cold and havent been started in a while. But after that it goes straight to garbage dmd.
I am also unsure how high it is safe to trim the 5v pot when testing.

We will burn the latest stargate game rom on friday, so will in any case update of the progress.

Thanks,
Morten

#2 2 years ago

Why not just order the latest ROMs from Pinball Resource? It's the least invasive thing you could do at this point, and you'd be guaranteed to have the most recent code.

If Stargate is anything like earlier alphanumeric System 3 games, ROMs without a revision number indicate that it's the first revision--i.e. your ROMs could very well be the first ones sent out with games.

#3 2 years ago

Updating the ROMs to version 4 should address the issue. It's a known bug.

#4 2 years ago
Quoted from mbaumle:

Why not just order the latest ROMs from Pinball Resource? It's the least invasive thing you could do at this point, and you'd be guaranteed to have the most recent code.
If Stargate is anything like earlier alphanumeric System 3 games, ROMs without a revision number indicate that it's the first revision--i.e. your ROMs could very well be the first ones sent out with games.

Yeah might be! Just had an order sent from pbr, and since i found the #5 game rom from the pinrepair site we will burn it onto the eprom and test. If needed i will order the full rom set from pbr with my next batch.. when getting the game up and running im sure i will discover more stuff i need from pbr =)

#5 2 years ago

Replace both capacitors C20 and C21 at the CPU board (1uF ceramic). They tend to loose their capacity over the years narrowing the Watchdog window. This watchdog is monitoring "keep alive signals". If these are not coming fast enough the watchdog kicks in resetting the game. The revision 5 game software is just speeding up the keep alive signals. The real problem are the capacitors and sometimes the 74HC123 (but rarely).

#6 2 years ago

No problem on 5v until you put it up to 5.15
Got the 3.1 rom without any problem but has it is write on pinrepair.com you might shunt all ground wires...it solves many problems on my Stargate

#7 2 years ago

Update: this issue was resolved with the newest software eprom!

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