(Topic ID: 256583)

Williams High Speed Display


By mucklup

11 days ago



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  • 15 posts
  • 7 Pinsiders participating
  • Latest reply 8 days ago by PinballManiac40
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#1 11 days 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 11 days 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 10 days 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 10 days 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 10 days ago

You have some major corrosion there.

#6 10 days ago

Here’s a picture of that area.

22E1F184-E2A7-4950-BAA4-DF8B8E9BD79A (resized).jpeg
#7 10 days 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 9 days 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 9 days 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 9 days 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_35_29-2019-11-30 22_31_33-Slack - Windows Photo Viewer (resized).png

#11 9 days ago
Quoted from PinballManiac40:

Lots of parts to be replaced.

Wonder whats under the battery holder??

#12 9 days ago
Quoted from GRUMPY:

Wonder whats under the battery holder??

More corrosion within the traces to deal with.

#13 8 days ago

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

#14 8 days 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 8 days 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.

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