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Macintosh IIsi Troubleshooting
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=== Sound loss and video === The IIsi blanks its sound when the sprung metal fingers linking the speaker to the logic board oxidise, often only after the machine has warmed up for a while — clean those contacts. The audio-filter capacitors in the north-west corner of the board are a second cause of lost or distorted sound. For a no-video IIsi, check the PRAM battery before chasing the video path.<ref name="iisi">[https://stason.org/TULARC/os-macintosh/hardware/32-How-can-I-fix-the-sound-on-my-IISI-Macintosh-hardware.html How can I fix the sound on my IIsi?], TULARC; and the [https://www.ifixit.com/Device/Macintosh_IIsi Macintosh IIsi] device page, iFixit. Source for the oxidised speaker-contact sound blanking, the north-west-corner audio filter caps, and the check-the-PRAM-battery-first video guidance.</ref>
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