Mac: the speaker is silent, and the in-ear monitoring interface is highlighted with a red light

History:

June 29,200 9: Incorrect change.
Reminder, modification error. Thank you.
Tadiyan
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Symptom:

The built-in speakers have no sound, and it is useless to adjust the volume at the sound volume. Many Apple laptops have red light at the headphone jack.

Restarting and reinstalling the system cannot be solved.

 

 

Solve the Problem of silent speakers and red lights at the plug-in:

What is the principle?


There is a mechanical switch in the plug-in. Normally, when the headset is inserted, the switch is turned on. Then the Mac OS X system will know that a headset is inserted, so the built-in speaker is closed, the sound signal is output from the headset. After the headset is pulled out, the switch is automatically disabled.

 

Careful users can detect system changes. For details, refer to the changes in the system's voice when the earphones are inserted and the earphones are not inserted:

 

 

 

 

 

 

The problem is:


For various reasons, the switch may not be automatically closed, which may cause LZ problems, because the system considers that the headset is not pulled out. Apple's headset plug-in also supports fiber-optic audio. When an external device is inserted, it enables the fiber-optic audio input/output device and emits this red light.

Judging from this red light, many professional Apple maintenance personnel are unaware of this problem from the post on the Internet. They generally think that the main version is broken.

Solution:


It's easy, just a toothpick -- of course other things can be replaced.
Try to insert it into the ear hole and gently try different angles and positions. You will feel a bit congested, and that place is the switch. If you find the right place, you will touch it, the red light will go out, and the red light will go out. Two MacBook S have been repaired.

I can't help but wonder if another essential tool for Apple is not a toothpick?