reallyrandy Posted July 17, 2017 Report Share Posted July 17, 2017 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? Thanks, Randy Quote Link to post Share on other sites
bibilit Posted July 17, 2017 Report Share Posted July 17, 2017 Caps maybe..... Quote Link to post Share on other sites
bigmessowires Posted July 17, 2017 Report Share Posted July 17, 2017 That's a common symptom of failed capacitors on the logic board. Quote Link to post Share on other sites
reallyrandy Posted July 17, 2017 Author Report Share Posted July 17, 2017 I'll have to get it recapped probably. Quote Link to post Share on other sites
blitter Posted July 17, 2017 Report Share Posted July 17, 2017 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. Quote Link to post Share on other sites
tanuki65 Posted July 18, 2017 Report Share Posted July 18, 2017 I had a IIci, recapping gave it sound Quote Link to post Share on other sites
AlpineRaven Posted July 23, 2017 Report Share Posted July 23, 2017 Failed caps - my IIsi is the same. I will re-cap it when I bite the bullet for it.Cheers AP Quote Link to post Share on other sites
Unknown_K Posted July 23, 2017 Report Share Posted July 23, 2017 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). Quote Link to post Share on other sites
AlpineRaven Posted July 29, 2017 Report Share Posted July 29, 2017 no sound could be indication that the caps are gone as said above. My IIsi has that problem too.Cheers AP Quote Link to post Share on other sites
mac57 Posted October 24, 2017 Report Share Posted October 24, 2017 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. Quote Link to post Share on other sites
IIfx Posted October 24, 2017 Report Share Posted October 24, 2017 (edited) 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 October 24, 2017 by IIfx Quote Link to post Share on other sites
mac57 Posted October 26, 2017 Report Share Posted October 26, 2017 Quite agree... I am buying time, not solving the root problem! Quote Link to post Share on other sites
sigtau Posted October 26, 2017 Report Share Posted October 26, 2017 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. Quote Link to post Share on other sites
bibilit Posted October 29, 2017 Report Share Posted October 29, 2017 On the IIsi, i will add some tin on the underside of the board, where the speaker is making contact, will help to improve the setting. Quote Link to post Share on other sites
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