(Topic ID: 214946)

Junk yard - problem with the audio/sound board and display

By jimy_speedt

1 year ago

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  • 13 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by jimy_speedt
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#1 1 year ago


I have a strange behaviour with the sound and display. Sometimes everything boots without problem, the display is as normal it plays properly.

At some time, I get problems with the display (horizontal lines, or dots, or even dark)

The display is new and works fine if I put it on another machine .
I replaced the ribbon cable from the A/S board, same problem
Then resoldered the J603 male connector and fuses support, same problem remains.

By looking at the audio board, I noticed that it sometimes boots properly Wwith the led 503 flickering. After a while, either the led becomes steadily lit, or dark (in which case the display becomes dark as well).

Can anyone bring some help ?

Thanks in advance

08CFA655-245B-4E37-951C-CBA154765E8F (resized).jpeg

#3 1 year ago

Just did it. The A/S led flashes once, then dark ...

#5 1 year ago

Is this one ok ?

C2218F7A-948E-441A-8113-76EF0B262FD6 (resized).jpeg

#7 1 year ago

got your message. I will remove the MPU and check if the board was damaged, yes there is alkaline. And unfortunately, I do not have another WPC95 to check. thanks a lot, I ll keep you posted if I find someone with whom I can swap boards.

1 week later
#8 1 year ago

The CPU is not damaged. I have replaced the ASIC but there is no better behaviour. Can it pe the CPU-A/S board flat cables ? anything else to check ?

#10 1 year ago

Thanks for your help, Inkochnito. This chip does not exist on wpc95 a/v board

By measuring outgoing voltages on the A/V board, I get -117vdc instead od of -125vdc on Pin1, -91vdc instead of -113vdc. I guess the difference might be bit too high to forget about it. No ? Should find wpc95 schematics

#12 1 year ago

Thanks PinballManiac, I ordered this rebuild kit. What you are writing to me confirms what I had read on the pinwiki link, also on the B/W repair guide.

3 weeks later
#13 1 year ago

I replaced the AV parts by a kit, and it works ! Thanks!!!

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