(Topic ID: 193560)

Gottlieb system 80b display issues need help please


By Antennaejim

1 year ago



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  • Latest reply 1 year ago by Antennaejim
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    #1 1 year ago

    The display was working with garbled info on the top display and the bottom display was working perfectly. I turned the game off and now both displays are off. The 32v is reading at 25volts and the other voltages read slightly lower as well from the transformer. The 5 volt power supply is putting out exactly 5 v D.C. I adjusted accordingly. The connector is jumpered at the transformer for 110v setting as required and I have 120 at the house supply. Does anybody have any info for these system 80b nightmares? I have re pinned every connector related to the display power and data feeds. I have also performed all of the ground mods at the transformer base and the individual boards behind the backglass. All fuses are good. Also I have a new daughter board piggyback installed and the game plays fine with audio and multiball. I tried pulling the starter and the backglass bulb and it didn't make a bit of difference. The game itself plays fine other than the display issue. The display no longer works ?.

    #2 1 year ago

    Anybody out there?! I can hear echoes!

    #4 1 year ago

    So....has the display EVER worked properly since you've owned the game?
    Garbled text on one glass is usually a failed 10939 decoder on the display. These are tough to get as they are long obsolete.

    If the interface between the MPU board and the display is not absolutely 100% working, then the displays will be blank. A single bit of information not making it from the MPU to the display will cause this.

    With power OFF, reseat both ends of the wire harness.
    If that doesn't work, closely examine the connectors.
    --
    Chris Hibler - CARGPB #31
    http://ChrisHiblerPinball.com/contact
    http://www.PinWiki.com - The Place to go for Pinball Repair Info

    #5 1 year ago
    Quoted from ChrisHibler:

    So....has the display EVER worked properly since you've owned the game?
    Garbled text on one glass is usually a failed 10939 decoder on the display. These are tough to get as they are long obsolete.
    If the interface between the MPU board and the display is not absolutely 100% working, then the displays will be blank. A single bit of information not making it from the MPU to the display will cause this.
    With power OFF, reseat both ends of the wire harness.
    If that doesn't work, closely examine the connectors.
    --
    Chris Hibler - CARGPB #31
    http://ChrisHiblerPinball.com/contact
    http://www.PinWiki.com - The Place to go for Pinball Repair Info

    I have completely repinned all of the connections for the display. The mpu connector and the power connector associated to the display as well as the connector at the display all brand new crimps and I used a pink eraser on the display board and mpu board. Yes the display worked intermittently when I first turned the machine on now it is completely dead. I just replaced all of the old elect capacitors today as well and still nothing is working on the display. I'm guessing ic chips next on the mpu and display?

    #6 1 year ago

    I wouldn't replace anything on the MPU yet. I have access to several games/displays so I'd mix and match to isolate. There are other System 80 guys in your area. Perhaps one can help. You can look up Jim Palson at JT Amusements. He's up in Duncannon.
    --
    Chris Hibler - CARGPB #31
    http://www.ChrisHiblerPinball.com/Contact
    http://www.PinWiki.com - The Place to go for Pinball Repair Info

    #7 1 year ago

    He is about an hour away or so correct. I don't have any other system 80b boards or access to them to swap. And my ac voltages are reading low from the transformer to the display.

    #8 1 year ago

    Ok I took my display over to a friend's house that has a working system 80b I plugged my display in and it still does not fire up. The cr1-4 test out fine, vr1,2 are good as well as all of the resistors are good on the board. It's either z1,2 or u3. I know u1 needs to be replaced for sure as I had a garble when it was working originally on the top display.

    #9 1 year ago

    I can tell you that removing those ICs is tough to do without the right tools. I'd seek out Mr Palson. I know he has the ability and the parts.
    --
    Chris Hibler - CARGPB #31
    http://ChrisHiblerPinball.com/contact/
    http://www.PinWiki.com - The new place for pinball repair info

    #10 1 year ago

    I have a desoldering tool I used to remove the daughter board from the mpu like a champ! I also work on my own tube amplifiers so I do have good soldering skills these damn gottliebs are kicking my ass though. I have replaced ics on Williams, ballys, sterns, data east, and Sega pins successfully before so this is not a first time thing. Gottlieb does not like me for some reason!

    #11 1 year ago

    Good to hear. Please let us know what fixes it.
    --
    Chris Hibler - CARGPB #31
    http://ChrisHiblerPinball.com/contact/
    http://www.PinWiki.com - The new place for pinball repair info

    #12 1 year ago

    Will do I'm just waiting on the chips I ordered

    #13 1 year ago
    Quoted from ChrisHibler:

    Good to hear. Please let us know what fixes it.
    --
    Chris Hibler - CARGPB #31
    http://ChrisHiblerPinball.com/contact/
    http://www.PinWiki.com - The new place for pinball repair info

    Any idea why I'm getting 20v ac off of my 32v ac section of my transformer? I'm also getting 16v D.C. In my 24v D.C. At the transformer? 6v section reads 6v. What gives here I'm getting 120ac from my outlet! Is my transformer bad? This may be a contributing factor as to why my display is not working as well?

    #14 1 year ago

    Well I tested a raven display in my gold wings this evening and everything worked well. So I'm definitely dealing with a ic chip on the display board

    #15 1 year ago

    Ok guys I replaced u1 and all six diodes and she's back to life again!

    IMG_3830 (resized).JPG

    #17 1 year ago

    Hooray! good work!

    #18 1 year ago

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