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(Topic ID: 195162)

Williams system 6 display issue.

By doompin

6 years ago

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12 posts
4 Pinsiders participating
Latest reply 6 years ago by Schwaggs
Topic is favorited by 2 Pinsiders

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#1 6 years ago

JAY

I've got a bit of a weird one. A year ago I resurrected a completely dead Firepower. In doing so I replaced the driver board, power supply and all of the displays with brand new Rottendog products. Suddenly this afternoon the master display and player one are out of sync with the other displays. More specifically the master and P1 are a digit ahead of the others. They start on 1 while P1, P2, & P3 start on 0 (as they should.) I ran the display diagnostic and they count through the process out of sync. So I went ahead and went through the process of initial setup of the MPU board again and they are still out of sync. Next I reseated all the connections. Still out of sync. Nothing has been touched behind the back glass in months so nothing physically changed. This one has me stumped. Thoughts?

IMG_1001 (resized).JPG

#2 6 years ago

ZAC

zacaj

RPC

Rochester, NY

11y 158K 10,387 85 122 1

Do they do that in-game too? Start on ball 2, go to ball 4 if I'm understanding you correctly?

#3 6 years ago

JAY

doompin

Pinside member

8y 51,800 155 9 75

Yes

#4 6 years ago

JON

Schwaggs

Gameroom Mods

10y 105K 4,760 10

Have you gone through display diagnostics and see what numbers they cycle through? Should be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0....

What you are looking for is the master P1 and P2 not counting up through all the numbers correctly. BCD 1 digit might be stuck high. If this is the case, these displays will count up 1, 1, 3, 3, 5, 5, 7, 7, 9, 9, 1, 1....

#5 6 years ago

JAY

doompin

Pinside member

8y 51,800 155 9 75

Quoted from Schwaggs:
Have you gone through display diagnostics and see what numbers they cycle through? Should be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0....
What you are looking for is the master P1 and P2 not counting up through all the numbers correctly. BCD 1 digit might be stuck high. If this is the case, these displays will count up 1, 1, 3, 3, 5, 5, 7, 7, 9, 9, 1, 1....

That is exactly what it is doing.

#6 6 years ago

JON

Schwaggs

Gameroom Mods

10y 105K 4,760 10

OP
Quoted from doompin:
That is exactly what it is doing.

So that means the BCD "1's" digit (also called A1) for Master, P1 and P2 is sticking high. Probably the PIA IC18 on the CPU board. Or it could be the Master Display board BCD to 7-segment driver (far less likely).

If you have a PIA handy, it would be worth swapping the one on your Rottondog board to see if it fixes it. I bet it is socketed on the Rottondog board. If not, time to contact Rottondog for troubleshooting and repair.

#7 6 years ago

JAY

doompin

Pinside member

8y 51,800 155 9 75

Quoted from zacaj:
Do they do that in-game too? Start on ball 2, go to ball 4 if I'm understanding you correctly?

Yes it does it in game too.

#8 6 years ago

JAY

doompin

Pinside member

8y 51,800 155 9 75

Quoted from Schwaggs:
So that means the BCD "1's" digit (also called A1) for Master, P1 and P2 is sticking high. Probably the PIA IC18 on the CPU board. Or it could be the Master Display board BCD to 7-segment driver (far less likely).
If you have a PIA handy, it would be worth swapping the one on your Rottondog board to see if it fixes it. I bet it is socketed on the Rottondog board. If not, time to contact Rottondog for troubleshooting and repair.

Unfortunately I do not have one handy and the one from the original board is soldered on not socket. Any idea where to get another? Mouser perhaps? I'm a novice with board issues but if I could just order the PIA and not have to send it back that would be preferable.

#9 6 years ago

TPR

frunch

Pinside member

Point Pleasant, NJ

11y 135K 3,642 10

Marco's got em:

http://www.marcospecialties.com/pinball-parts/6821

#10 6 years ago

ZAC

zacaj

RPC

Rochester, NY

11y 158K 10,387 85 122 1

Might even be a connector? If that pin wasn't making contact you'd get this problem. Try doing a continuity test from the pin on the pia to the bcd decoder on the master display board.

2 weeks later

#11 6 years ago

JAY

doompin

Pinside member

8y 51,800 155 9 75

Quoted from Schwaggs:
So that means the BCD "1's" digit (also called A1) for Master, P1 and P2 is sticking high. Probably the PIA IC18 on the CPU board. Or it could be the Master Display board BCD to 7-segment driver (far less likely).
If you have a PIA handy, it would be worth swapping the one on your Rottondog board to see if it fixes it. I bet it is socketed on the Rottondog board. If not, time to contact Rottondog for troubleshooting and repair.

Changed the chip today and it did the trick. Thanks for the help Schwaggs

#12 6 years ago

JON

Schwaggs

Gameroom Mods

10y 105K 4,760 10

OP
Quoted from doompin:
Changed the chip today and it did the trick. Thanks for the help schwaggs

Awesome! Congratulations on the fix!

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