(Topic ID: 248765)
Lenoir City, TN
Quoted from nephasth:Alpha-numeric display. Try reseating the connectors.
Will try that - thx
Quoted from yzfguy:I came here for the system 11 DMD hybrid pics
Sorry to disappoint - title changed 
1 month later
Update to this thread and same questions.
Anybody ever see this and know the solution?
It appears the bottom half is OK and the top half is all “dashes and commas” ...
Does that point to anything?
I would have no problem buying a new display if that was the issue
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Quoted from russdx:ribbon or bad segment row driver chip
Are those chips on the display circuit board or in the back box?
3 weeks later
Ok ... I swapped out the Jokerz entire display AND ribbon cable with my Roller Games and the problem followed.
So, I thought the logic chips that ran the display are on the display board itself. Is there another set of chips on the CPU board I should look at?
What I know:
1) it's not the display (Roller Games display showed exact same garbage)
2) it's not the ribbon cable (used the RG cable and problem remained)
What's next. I have the schematic but cant find chips that drive the upper display?
Thx guys for any help!
Quoted from MT45:) it's not the display (Roller Games display showed exact same garbage)
It's a CPU problem in the Jokers.
Quoted from GRUMPY:It's a CPU problem in the Jokers.
Thanks for the info ... to clarify, the CPU board is the source? Do you have suggestions on specific chips?
Quoted from MT45:Do you have suggestions on specific chips?
Maybe u-41 or SRC 2. Since it's the G segment and the Comma and they both go thru SCR 2 pins 8 and 9. The SCR maybe cracked after pin 7. You can check the resistance of the SCR. You check from pin 1 to pin 2, pin 1 to pin 3 and so on. All should be 4.7k ohms. Pin 1 is marked with a white dot on the board.
Quoted from GRUMPY:Maybe u-41 or SRC 2. Since it's the G segment and the Comma and they both go thru SCR 2 pins 8 and 9. The SCR maybe cracked after pin 7. You can check the resistance of the SCR. You check from pin 1 to pin 2, pin 1 to pin 3 and so on. All should be 4.7k ohms. Pin 1 is marked with a white dot on the board.
Thx. Will do tonight. Super helpful. It also helped me find the info on the CPU schematic. See below. Yellow for SRC2 and then red circle around “G” and “COM” (short for comma). Never knew that was what it meant and this helps me going forward on other games. I Still don’t know how you ID which display it was - as in upper or lower. In any case, thanks again and I’ll report back later
52733FE7-86D8-40B7-A4D4-382CD399976C (resized).jpegTested the SRC2 and also took a few pics. It's a mess of corrosion so I'm going to replace it
Is this the correct part at GPE?
Here were my readings in K ohms
Pin 1 to 2 was 4.8
1 to 3 was 4.9
1 to 4 was 4.7
1 to 5 was 0.5
1 to 6 was 0.4
1 to 7 was 0.4
1 to 8 was 0.3
1 to 9 was 0.2
1 to 10 was 0.2
IMG_6295 (resized).JPG
IMG_6291 (resized).JPGIMG_6294 (resized).JPGIMG_6292 (resized).JPGIMG_6293 (resized).JPGYou have alkaline corrosion in U41, SRC1-5 and in your reset section. Suggest neutralizing and repairing the corrosion. To replace SRC2 you will need a 9-pin 8x bussed resistor network.
http://www.pinwiki.com/wiki/index.php?title=Williams_System_9_-_11#Repairing_Alkaline_Corrosion
Quoted from MT45:Is this the correct part at GPE?
You can use this part, but you need to cut off pin 10 and make sure it doesn't touch the board when installed.
Quoted from MT45:It's a mess of corrosion
I think I would pull all of the resistor packs and clean up the board then install 5 new packs.
I would also replace C-30.
Quoted from GRUMPY:You can use this part, but you need to cut off pin 10 and make sure it doesn't touch the board when installed.
I think I would pull all of the resistor packs and clean up the board then install 5 new packs.
I would also replace C-30.
Will do on replacement as they look terrible and will probably fail in the future
Would this one be the direct replacement for SRC2?
20191011_185304 (resized).jpgQuoted from MT45:Would this one be the direct replacement for SRC2?
Yes this works fine too, fill pin 10 hole on the board with solder. Line up black dot on the part with the white dot on the board.
1 week later
Quoted from GRUMPY:Yes this works fine too, fill pin 10 hole on the board with solder. Line up black dot on the part with the white dot on the board.
Grumpy, you are the man! I followed your instructions and the problem is solved!
Ordered the 9 pin bussed resistor network parts from GPE
Tonight I removed and replaced SRC1, 2 and 3
I lined up the stripe on the new resistor with the white dot - did a test fit first
I put a dot of solder in hole 10 as there was no matching pin of course
Checked the traces with a bright light behind the board and all looks good
Back of the board looked good too
Turned it back on and boom ... I've got a working display again
Cant thank you enough Grumpy!
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Quoted from GRUMPY:Great job on the repair.
Playball!!
Thank you again sir!
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