(Topic ID: 293048)

HELP! No Sound in Bride of Pinbot

By Cheeks

1 year ago



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  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 1 year ago by Crispin
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#1 1 year ago

I'm trying to help out a friend who has a working BoP (original, not 2.0) but there is no sound. Like NO sound at all.

I have a 2.0, so I have spare boards that I pulled from my game years ago. After checking connections, I swapped the sound board, the cpu board, and the ribbon cable that goes between these 2 boards. Still nothing. Where do I go from here? I have a spare speaker panel. Should I swap that or is there something else to check?

In case it matters, the game has a Pinball Pro sub installed in the game, but I don't know why that would change anything.

Please help with where to start.

THANKS!

#2 1 year ago

Does anyone have any insights on where I should start troubleshooting this?

#3 1 year ago

I can't confirm this 100% because I see nowhere in the manual how the speakers are wired , but I'm pretty sure it is also wired the same way as the games in the next WPC board since the audio circuit is identical, but if the sub woofer is unplugged, it will cut sound in all speakers. The 2 speakers in the cabinet are paralleled but in series with the sub woofer. It could be as simple as a disconnected or broken wire to one of the speakers, a broken speaker itself (if the coil of the sub is broken you lose sound every where).

Checking all the voltages and fuses related to the sound board is always the first step if it's not a loose wire.

If all the voltages are there, then you can touch the pins of the amplifier U1 on the sound board (pin 1) and listen for a hum, which would indicated the amplifier itself is good. Beyond that you might need a logic probe with audio or an oscilloscope to test the board further.. U5 x9503 is known to fail too (its the volume control chip) measure its output at pin 5 can tell you if it's working properly.

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#4 1 year ago
Quoted from Roamin:

I can't confirm this 100% because I see nowhere in the manual how the speakers are wired , but I'm pretty sure it is also wired the same way as the games in the next WPC board since the audio circuit is identical, but if the sub woofer is unplugged, it will cut sound in all speakers. The 2 speakers in the cabinet are paralleled but in series with the sub woofer. It could be as simple as a disconnected or broken wire to one of the speakers, a broken speaker itself (if the coil of the sub is broken you lose sound every where).

This is correct. Double check the cabinet speaker wires if you haven't already.

1 month later
#5 1 year ago

OK guys, I'm completely stumped. Based on the feedback, I completely assumed that the cabinet speaker was the issue. I tested with 2 known working speakers and it did not restore the sound. Does it need to be the right Ohms or whatever to still produce any sound from the machine? I tested continuity at various points and even from one connector on the sound board to the other connector on the sound board. It tested positive continuity all around.

I can't see how it's a bad chip since I have tried 2 entirely different sound boards.

In total, I have swapped the sound board, cpu board, and ribbon cable between them - and confirmed continuity along the speaker/sub wiring. I even swapped in a spare BoP speaker panel assembly, just because. Nothing.

I'm at a complete loss.

Anyone have any other thoughts?

#6 1 year ago

Check the high voltage output for the displays. I have a Bally 6803 Heavy Metal Meltdown that had no sound. After confirming everything was good in the sound circuit I went to double check all voltages at their test points. I had 190V going out to the displays, I dialed it back to 170V and my sound started working. I know they're 2 totally different systems but it's worth a try.

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