Pinbot
Williams, 1986My top and bottom right displays are not working correctly. The top display has double letters the bottom display sometimes does not show anything in the second to the left digit.
I switched the display plugs left to right and the problem follows to the other side. This must mean there is something wrong with the display driver board, is that correct?
IMG_1075 (resized).JPGIMG_1077 (resized).JPGYour CPU sends the signals to the alphnumeric master display board, telling it what to do.
So reseat all your connections, particularly the ribbon cables to the CPU.
This is presenting like problems on the alphanumeric master display board.
I've repaired these, it involves finding out what chips are involved with the symptom, and pulling those chips, putting in a socket, and putting a known good replacement chip into the board. This is board repair. If you aren't comfortable with doing this level of work, you may want to send it to a board technician.
There are vast numbers of chips available from china that are counterfeit. Get replacement chips from reputable suppliers like Marco, Pinball Life, or Mouser or Digi-Key, not amazon or ebay and you can avoid some hair-pulling anxiety when your replacements don't work, or fail early.
Your manual is here:
https://www.ipdb.org/files/1796/Williams_1986_Pin_bot_Manual.pdf
The schematic for this board starts on PDF page 59.
The parts list (helpful) is on PDF page 40.
I don't see a replacement board for sale, and that's a bit surprising because a LOT of glass displays are getting replaced with LED's, and when this board (and the glass displays) are getting replaced, the leftover parts should be available for people like you who don't have glass problems but need the board. You might advertise on Pinside here that you want a alphanumeric master display Board D-10877, and see if some helpful pinsider can help you.
Good luck!
thank you for your help. So this will be a bad chip on the master display driver board, is that correct?
Other alternative would be to get a led driver board and displays?
Quoted from PinRetail:Your CPU sends the signals to the alphnumeric master display board, telling it what to do.
So reseat all your connections, particularly the ribbon cables to the CPU.
This is presenting like problems on the alphanumeric master display board.
I've repaired these, it involves finding out what chips are involved with the symptom, and pulling those chips, putting in a socket, and putting a known good replacement chip into the board. This is board repair. If you aren't comfortable with doing this level of work, you may want to send it to a board technician.
There are vast numbers of chips available from china that are counterfeit. Get replacement chips from reputable suppliers like Marco, Pinball Life, or Mouser or Digi-Key, not amazon or ebay and you can avoid some hair-pulling anxiety when your replacements don't work, or fail early.
Your manual is here:
https://www.ipdb.org/files/1796/Williams_1986_Pin_bot_Manual.pdf
The schematic for this board starts on PDF page 59.
The parts list (helpful) is on PDF page 40.
I don't see a replacement board for sale, and that's a bit surprising because a LOT of glass displays are getting replaced with LED's, and when this board (and the glass displays) are getting replaced, the leftover parts should be available for people like you who don't have glass problems but need the board. You might advertise on Pinside here that you want a alphanumeric master display Board D-10877, and see if some helpful pinsider can help you.
Good luck!
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Pulaski, PA