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SOLVED: Audio jack problem, no speaker sound, red light ...
https://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+red+light#:~:text=The%20red%20light%20in%20the%20headphone%20jack%20means,the%20port%20operates%20in%20optical%20or%20analog%20mode.
Red light in headphone jack and no sound … - Apple Community
https://discussions.apple.com/thread/3694502
Your analog/digital switch in the port is stuck -- the red light is the dgital audio signal. Try the headphone plug again, this time wiggling it from side to side while it's plugged in. Repeat as needed. If no luck, take the machine in for repair under your warranty.
MacBook speakers off, red light coming from the headphone jack
https://apple.stackexchange.com/questions/261282/macbook-speakers-off-red-light-coming-from-the-headphone-jack
macRumors ref: No sound out of MacBook speakers & red LED in Headphone jack. The red light is probably because its a Mini-TOSLINK port . There is a metal prong in the jack and sometimes it can be bent , causing the digital audio to be turned on when it shouldn't be.
SOLVED: Audio jack problem, no speaker sound, red light ...
https://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+red+light
The red light in the headphone jack means that the MacBook Pro thinks that an optical audio cable is plugged into the port. Try unplugging and replugging a headphone plug into the port several times. There is a tiny sensor inside the port that determines whether the port operates in optical or analog mode.
SOLVED: My headphone jack glows with a red light - …
https://www.ifixit.com/Answers/View/59477/My+headphone+jack+glows+with+a+red+light
Your digital audio out has switched on. You can insert a plastic toothpick in the hole and try and switch it off. The switch should be at the 3 o'clock position and go towards the 6 o'clock position. Some people also have had luck inserting their headphone jack and pulling out a few times.... - MacBook Unibody Model A1342
sound - Red light from headphone jack Macbook Pro …
https://askubuntu.com/questions/643757/red-light-from-headphone-jack-macbook-pro-running-ubuntu-14-04
These are the steps to solve red light audio jack issue in Macbook. open system settings. go to output tab, select speakers - Built-in Audio option under Play sound through category. look for the mode option under settings for speakers category. Change mode from Analog Stereo Output to Analog Surround 2.1 Output or Analog Surround 4.1 Output. Enjoy!
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