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I have an LC III that I had recapped, both the power supply and logic board were recapped and cleaned, on receiving it back everything worked with flying colors, but now (only a week later) the internal speaker isn't working. I've tried zapping the PRAM and booting from a different hard drive to rule out software issues, also the headphone jack in the back works if I plug in some ear buds. What do I need to go over next?

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    as a quick test: you can unplug the speaker and connect it to a small 1.5v battery to see if it clicks; that will make sure the speaker itself is not damaged (and most likely it is not since they almost never break). Do you have the schematics of the board? if the jack is working and the speaker is not, we can probably pinpoint a few likely problems and come up with some troubleshooting steps
    – Thomas
    Commented Dec 10, 2016 at 23:11

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The simplest thing to do with your LC III is plug in external speakers and not worry too much about it. The LC III supports stereo sound so external speakers will sound better than the internal speaker anyways. Once I damaged the headphone jack of a PowerBook and the tech at Tekserve noted that I could either replace the motherboard for a few hundred dollars, or plug in a USB headphone adapter for twenty bucks, good advice then, and still good advice.

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If memory serves the LCIII uses a 2 pin 4ohm speaker. Is it possible you simply didn't reattach it the last time you had the board out?

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    And the speaker wire is very easy to rip off when opening the case...
    – tofro
    Commented Dec 11, 2016 at 8:57

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