(Topic ID: 218814)

Gottlieb System 3 artefacts on display


By arolden

1 year ago



Topic Stats

  • 11 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by TimBoch
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

Hi everyone.

Looking for some advice on where to focus with troubleshooting a System 3 display driver board. I got this board non-working and missing a U8 chip. I bought a new U8 from PBR and installed it. Upon plugging it in I checked all of the voltages and they are in spec. However there are artefacts all over the display with blank (black) sections regularly spaced apart. You can actually see what should be on the display in the lit sections but it is hard to make out. The animations move and progress normally. I have replaced U4 with no change in behaviour. This board was tested in a working game so ribbon cables and other hardware are not at fault. I suspect one of the other ROMs is at fault but not sure which one it could be.

Can anyone advise before I start shotgunning them all? noflip95?

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#2 1 year ago

Here are some pics from the display test. Unfortunately I can't tell what's going on.

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#3 1 year ago

Did the game start or not?

#4 1 year ago
Quoted from Benhurr:

Did the game start or not?

Yes the game starts normally.

#5 1 year ago

So I'm lost at the same point with my Stargate...somebody told me to change U4 but you says that it don't work...I'll bought every chip this afternoon and tell you what it done...already change U3 U8 also U5;6;7 U16;17 and every other component at it is required when unplugged DMD.
My post is called Gottlieb garbage DMD

#6 1 year ago

I've change U4 for beginning and it work a little bit better with moving sequences...
After change U1 U9 U12 (forget U10 an U11 see that tomorrow) U13 U14 and U15 nothing better
I'm on the good way but enable to buy U2 at market...May be on the web

#7 1 year ago

Better when I change the big one U1 so I think U2 need to be change but not even U5;6;7 U9; to U12, U13 to U17
Good luck

#8 1 year ago
Quoted from Benhurr:

Better when I change the big one U1 so I think U2 need to be change but not even U5;6;7 U9; to U12, U13 to U17
Good luck

So the only improvement so far was from U1? Interesting.

Let me know if you have any luck after changing U2.

#9 1 year ago

So I replace every chip on this card and still garbage when playing scene from the movie...I'm thinking that it may comes from the DMD itself cause I ears some noise coming from it just when screen blinking. It may had trouble when did a bad replacement on A5. As it is out of gas (probably the original one) I will change it as soon.

Good luck

2 months later
#10 1 year ago

Finally, success!

I replaced U4, U9, U10, U11 and U2 with no improvement. Then I decided to replace U13 which had caused other display artefacts as described in my other thread: https://pinside.com/pinball/forum/topic/gottlieb-system-3-vertical-lines-on-display

And it worked!

It is odd that on the 2 display drivers I have repaired recently, U13 has been the problem on both. It looks like a common failure point and I'll be replacing it before U4 in future.

image (resized).jpg
#11 1 year ago
Quoted from arolden:

Finally, success!
I replaced U4, U9, U10, U11 and U2 with no improvement. Then I decided to replace U13 which had caused other display artefacts as described in my other thread: https://pinside.com/pinball/forum/topic/gottlieb-system-3-vertical-lines-on-display
And it worked!
It is odd that on the 2 display drivers I have repaired recently, U13 has been the problem on both. It looks like a common failure point and I'll be replacing it before U4 in future.
[quoted image]

It's always nice to see another person that actually enjoys Tee'd Off. About a year ago I replaced my DMD with pin2dmd and started learning to colorize it. There are still parts to do, but it's sure looks good in color.


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