Please ensure you are comfortable with careful handling of a powered on laptop with open case. Some part of this guide also require the Macbook to be running for diagnosing the issue. Make sure Mac model Speakers is selected, the Output volume slider is not all the way to the left and the Mute tick box is. (You may need to scroll down.) Open Sound settings for me. On your Mac, choose Apple menu > System Settings, then click Sound in the sidebar. Input audio from external audio source - input dead, checked systems > preferences > sound - settings all OK. Unplug any headphones or external speakers. Output a tone from audio app (Signal Inspector or other) - audio output works OK. I do not cover removal of the bottom case of a Macbook or soldering technique in this guide. Plug in - device recognised for IN and out by Audio-Midi and apps, sets 96kHz OK. Not recommended if your Mac is in warranty.As such this guide is for people who have ruled out debris in the headphone jack or a faulty sensor down the jack hole. This guide is for anyone for who has tried inserting something into their headphone port but this is not working or not fixing the audio consistently. This meant that more often than not, it was triggering the optical out red light and preventing sound from my internal speakers. On investigating the issue on my mac I discovered the issue was due to a poorly soldered pin on the headphone jack whose solder joint was already pretty poor and had become disconnected over time. Mac in images was an Early 2015 13” Macbook pro but this guide may help other model owners. For anyone who has a Macbook / Pro with the red light stuck coming out of the headphone port and no sound!
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