(Topic ID: 256583)

Williams High Speed Display

By mucklup

4 years ago


Topic Heartbeat

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  • 18 posts
  • 8 Pinsiders participating
  • Latest reply 4 years ago by woody76
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#1 4 years ago

I recently acquired a Williams System 7 machine with display issues. I purchased a X Pin display board with LEDs and although improved, I still have these problems:

1. Player 1 and 2 displays always have small number “7” in the lower left corner of all positions.

2. The center (horizontal) segment of the balls remaining display is always on.

I’ve switched LEDs and that’s not the issue.

I’d appreciate any help

Thanks
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#2 4 years ago
Quoted from mucklup:

I’d appreciate any help

Thanks

Is there any corrosion damage on the board? Can you take pic of the CPU board around the battery area. Do you have a logic probe?

#3 4 years ago

Unfortunately, I don’t have a logic probe, but could probably find one to borrow.

The battery holder was shot, so I removed it and have temporarily clipped a separate holder into in place. Need a little time to get set up to solder. I have yet to look at the back of the board.

Not sure which chip is the CPU. Here’s a shot of the whole board

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#4 4 years ago

You have a lot battery leakage damage on the CPU board. Can you remove the ribbon cable and take a pic of the area I circled.

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#5 4 years ago

You have some major corrosion there.

#6 4 years ago

Here’s a picture of that area.

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#7 4 years ago

With that much damage I'm really shocked that you can even play a game. Your board is toast, not cost effective to sent it to someone to be repaired. Best bet is to buy a replacement and sell this one on ebay.

#8 4 years ago
Quoted from GRUMPY:

With that much damage I'm really shocked that you can even play a game. Your board is toast, not cost effective to sent it to someone to be repaired. Best bet is to buy a replacement and sell this one on ebay.

I agree 200%. That's a LOT of work to fix that board. I've fixed boards with narrow, deep corrosion and boards with wide-spread shallow corrosion. This board has both - wide-spread, deep corrosion.

#9 4 years ago
Quoted from DumbAss:

I agree 200%. That's a LOT of work to fix that board. I've fixed boards with narrow, deep corrosion and boards with wide-spread shallow corrosion. This board has both - wide-spread, deep corrosion.

Wide-spread, yes, but this looks repairable. Deep corrosion makes the traces look black and I don’t see that here. Would take a lot of time to replace the affected components, but might be a clean, solid board when done.

#10 4 years ago

Looks very nasty and very much time consuming to work on. Lots of parts to be replaced. I'm working on one that is this bad and I'm not really enjoying it. 2019-11-30 22_31_33-Slack (resized).png2019-11-30 22_31_33-Slack (resized).png2019-11-30 22_35_29-2019-11-30 22_31_33-Slack - Windows Photo Viewer (resized).png2019-11-30 22_35_29-2019-11-30 22_31_33-Slack - Windows Photo Viewer (resized).png

#11 4 years ago
Quoted from PinballManiac40:

Lots of parts to be replaced.

Wonder whats under the battery holder??

#12 4 years ago
Quoted from GRUMPY:

Wonder whats under the battery holder??

More corrosion within the traces to deal with.

#13 4 years ago

I’ve seen listings for CPU board repair services as well as replacement boards. Any recommended repair providers that are recommended?

#14 4 years ago

Hi,
When I woeked for Betson we would have games come in with rodent pee and poop. The cleaning method was warm soap and water and a stiff bristle brush. If you have open runs you'd have to rewire them but the actual corrosion on the pins is not the problem. Its the conductivity between the pins. Just saying. The worst that could happen is the board would become unusable which it sounds is about where you are now. After the boards were cleaned, rinsed and thoroughly blown out we would put them in the furnace room for a day or so to insure they were dry. Good Luck

#15 4 years ago
Quoted from mucklup:

I’ve seen listings for CPU board repair services as well as replacement boards. Any recommended repair providers that are recommended?

Stay away from Ebay to have that board repaired. For the guys who repairs boards for a living, that is way too many parts that were hit to make it worth it.

I recommend stay away from Rottendog MPU as well.

Look for an original system 11 MPU that is tested, working, and undamaged. This will be your most reliable board to put into the game.

1 week later
#16 4 years ago

Removed board, back doesn’t look too bad, front very bad. I guess I’ll try cleaning the pins. Any suggestions for particular technique, tools or solution?

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#17 4 years ago

That is pretty bad. You can't just wash it away. Parts that were corroded, need to be replaced. The board needs to be treated without the damaged parts installed.

https://pinside.com/pinball/forum/topic/terrybs-guide-to-repairing-alkaline-battery-damage

https://pinside.com/pinball/forum/topic/terrybs-guide-to-repairing-battery-damage

#18 4 years ago
Quoted from mucklup:

Removed board, back doesn’t look too bad, front very bad. I guess I’ll try cleaning the pins. Any suggestions for particular technique, tools or solution?[quoted image][quoted image][quoted image][quoted image][quoted image]

that thing is toast. Any board repair guy worth anything will not touch this and if they do it will cost you a ton with no guarantee of not having future problems. I just had 2 sys11 mpu boards sent for repair, one was good and repairable and the other was not as bad as yours and he would not touch it. I would be willing to possibly sell my good one but it will be in the $400+ range. I replaced my 2 with rottendogs and have been pretty happy.

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