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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.
SOLVED: Audio jack problem, no speaker sound, red light ...
https://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+red+light
History. 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.
Red light in headphone jack and no sound - Apple
https://discussions.apple.com/thread/3694502?page=2
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.
Red light in audio jack, no sound! Help! | MacRumors Forums
https://forums.macrumors.com/threads/red-light-in-audio-jack-no-sound-help.573822/
It sounds like it is jammed in optical audio out mode. There's a microswitch that turns the port on and off. Looking into the port, the switch is …
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