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Author Topic: NO SOUND IN BB3 CPU  (Read 688 times)

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Offline arivera18

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NO SOUND IN BB3 CPU
« on: January 24, 2021, 12:03:27 PM »
My BB3 lost sound , anyone out there that could help on how to fix the board inside the cpu box ?
Thank you , Al.
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Offline Stayouttadabunker

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Re: NO SOUND IN BB3 CPU
« Reply #1 on: January 24, 2021, 06:54:16 PM »
The sound is boosted by an amp I believe....could be nothing wrong with your CPU board.
Try swapping the speakers and amplifier in another known good working machine to make sure THEY work.
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Offline badlanding

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Re: NO SOUND IN BB3 CPU
« Reply #2 on: June 05, 2021, 05:53:44 PM »
I have one of these problem CPU 3.2s and it looks like rickhunter has several, I know that my problem is with the SPDIF digital audio interface which is the RCA connector at the top of the board.  I have lots of experience reverse engineering complex electronic systems, time to have a look into this.
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Offline rickhunter

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Re: NO SOUND IN BB3 CPU
« Reply #3 on: June 05, 2021, 06:14:42 PM »
The "workaround" is to unplug the spdif cable and run the analog harness from the backplane to the audio jack input of the amplifier board.  This obviously doesn't fix your spdif, but at least you get sound out of it.
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Offline 92ramsfan

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Re: NO SOUND IN BB3 CPU
« Reply #4 on: July 05, 2021, 04:39:22 PM »
Touch up the connection with some soldier
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Offline Melissarmdlm

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Re: NO SOUND IN BB3 CPU
« Reply #5 on: July 23, 2021, 04:47:51 PM »
The board can be repaired. It's a multilayer board of course, solder may or may not clear up the problem. Generaly a bodge wire is used: From the plug to a component, but I don't remember the component it's on the top of the board though. The trace is not on top.
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