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I have an 11” MacBook Air that isn’t outputting sound through the internal speakers or headphone jack. Under output devices in System Preferences we get “No output devices found”. We reset the PRAM/NVRAM and SMC as usual, no dice. Is this just faulty hardware or a software bug?
Update: Running Apple Diagnostics gives an error stating there may be an issue with the audio device and code VFF001
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Try replace the relevant I/O board, that will possibly be all you need to do.
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I would try the cable first MacBook Air 11" (Mid 2013-Early 2015) I/O Board Cable and then the board MacBook Air 11インチ Early 2014 I/Oボードの交換
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