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It's also possible that the connection from the speaker itself to the logic board might be faulty. My dad had a IIsi with an oxidized speaker connection-- this is a common problem with that model. If a sharp rap to the top of the case will occasionally restore sound, that might be the issue.

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  • 2 months later...

I think blitter had it right - I have a IIsi with the same problem, and I have read repeatedly that the design of the speaker placement leads to poor speaker connections over time. I have never tried the "sharp rap to the top of the case" solution - I may just try that! In the meantime, I am just looking for some external speakers instead. I do not want to spend an eternity (or much money!) trying to get the internal speaker to work. I have a Quadra 840AV with the same problem (but related to caps this time), and I have "solved" it the same way. Seems to resolve the majority of the issue.

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If you have leaking caps eventually the external speaker will fail as well. The electrolyte will eat away at the motherboard. It's not a solution, it's a band aid on a missing limb.

 

In my experience Macs made prior to 1995 are starting to have their caps fail en masse. I now have a small pile of dead machines awaiting recap as a result. I waited a bit too long and there is some minor damage on some boards from corrosion.

Edited by IIfx
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IIsi has considerably easier caps to replace than, say, the IIci or IIcx.  The caps for the audio filter circuit are in the northwest corner of the board (if 'north' is where all the rear ports stick out).  If replacing those fixes your audio issue, you know the caps were bad.

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