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Mac IIsi, no sound

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7 replies to this topic

#1 reallyrandy

  • 6502

Posted 17 July 2017 - 02:10 PM

Running 7.0.1.


I know I've read something about this before but I can't remember what I could even check. I think this is a common problem.


Anyone know anything about it?




#2 bibilit

  • 68000
  • LocationParis area -FRANCE-

Posted 17 July 2017 - 02:12 PM

Caps maybe.....

Macintosh Classic and II ,CC, SE, SE/30,IIsi 25mhz(RasterOps video),Q 700,LC, LC III,LC475, PBook Wallstreet/Bronze/5300cs/1400c/100/Tibook Imac G3 slot-in, Bondi and G4 / PMac G4 sawtooth, QS, MDD, Yikes!, Cube, Imac Core 2 Duo, Ibook G3 (white/clam) G4 + Newton 120, eMate 300,Quicktake 150,  PowerCD

#3 bigmessowires

  • 68000
  • LocationSan Francisco Bay Area, CA

Posted 17 July 2017 - 02:24 PM

That's a common symptom of failed capacitors on the logic board.

#4 reallyrandy

  • 6502

Posted 17 July 2017 - 02:54 PM

I'll have to get it recapped probably.

#5 blitter

  • 6502

Posted 17 July 2017 - 06:37 PM

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.

#6 tanuki65

  • 6502

Posted 18 July 2017 - 05:53 PM

I had a IIci, recapping gave it sound


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#7 AlpineRaven

  • 6502

Posted Yesterday, 11:07 AM

Failed caps - my IIsi is the same. I will re-cap it when I bite the bullet for it.


#8 Unknown_K

  • 68LC040
  • LocationOhio/USA

Posted Yesterday, 11:53 PM

Take a look at the board and see if the capacitors have leaked all over. Bad capacitors in the audio circuit will kill sound, some machines like the LCIII will whistle while they die (unit will not turn on again without a recap).

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