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Sound only works through headphones - Apple Community

    https://discussions.apple.com/thread/7561880
    Question: Q: Sound only works through headphones. Hello! I have a 13-inch 2013 Macbook Pro with OS X Yosemite (10.10.5). I am having an issue with the internal speakers of my laptop. The audio plays just fine when I use headphones, but does not transfer to the speakers when I remove the headphones from the jack.

mac - Macbook Internal Speakers works only when headphones ...

    https://apple.stackexchange.com/questions/333491/macbook-internal-speakers-works-only-when-headphones-are-plugged-in
    if you internal speakers only work when you plug in headphones (assuming your headphones work properly), there's an issue with your headphone jack. There's an internal "switch" that tells the system which audio device is connected - that's probably being shorted.

Volume control only works with headphones. Built in ...

    https://forums.macrumors.com/threads/volume-control-only-works-with-headphones-built-in-speakers-dont-play-sound.864377/
    630. 75. Denver, CO. Feb 13, 2010. #1. When my headphones are plugged in I can use the volume control keys on the keyboard to adjust the volume just fine. But when I unplug my headphones the volume display goes dim, my volume control keys no longer work, and my speakers will not play sound. The problem started last week.

MacBook Pro Sound Not Working [FIXED] - Super Easy

    https://www.supereasy.com/macbook-pro-sound-not-working/
    1) Shut down your MacBook Pro. 2) Press the Shift, Control and Option keys on the left side on your keyboard and the Power buttons at the same time. Then hold them for 10 seconds. 3) Turn on your MacBook Pro. This should reset the SMC on your MacBook Pro. Now check to see if your MacBook Pro sound works now. Hopefully one of the fixes above worked …

SOLVED: Headphone Jack Stuck on Digital Out - …

    https://www.ifixit.com/Answers/View/821/Headphone+Jack+Stuck+on+Digital+Out
    The VoodooHDA kext for hackintoshes can force the audio codec to ignore the presence of an optical plug and give you normal behavior switching only between headphones and speakers. By removing a resistor (or inductor, depending on your exact model - my comment over on the macrumors thread specifies) from the circuit that detects as SPDIF optical plug, …

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