Macbook Pro Retina 13 Internal Speaker Volume Unbalance

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Level 1

5 points

Macbook Pro Retina 13 Internal Speaker Volume Unbalance

I bought a MBPR13 in early 2014 and it got an issue recently.

When I tried to play the music from internal speaker, I can hear the left side speaker volume is much louder than left side;

Then I had tried different types of player, iTunes, Youtube from Safari, Youtube from Chrome, I got same failure symptom.

But, when I plugged with my headset, the audio volume for left and right is balance.

looks like the failure only happened with internal speaker.

And I had tried to reset the NVRAM by pressing command+option+P+R at boot up; but no effect, failure symptom is same.

Can anyone help me to solve it?

MacBook Pro with Retina display, OS X Yosemite (10.10.3)

Posted on May 2, 2015 10:01 PM

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Answer 1

Best reply

dominic23

Level 10

83,910 points

May 3, 2015 4:44 AM in response to Jei_Lin

Go step by step and test.

1. System Preferences > Sound > Output > Internal Speakers

Settings for the selected device:

Balance:

Make sure that the slider is set at middle.

2. AudioMIDI Setup

Applications/Utilities/ Audio MIDI Setup.app

Audio Devices window

Side Bar

Click the Built-in Output.

Make sure that CH1 and CH2 volume sliders are matched.

3. Reset SMC.

Reset SMC. http://support.apple.com/kb/HT3964

Choose the method for: "Resetting SMC on portables with a battery you should not remove on your own".

Best.

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Answer 2

Jei_Lin Author

Level 1

5 points

May 9, 2015 11:14 AM in response to dominic23

thank you, Dominic, these are valuable suggestion.

but after I did these 3 actions, still cannot solve my issue.

Furthermore, let me update more issue symptom here.

This issue happened usually, but sometimes, rarely, the issue was gone; but the weird thing is I don't know when did my system

change from OK to NG.

This is HW issue? Should I change a new motherboard? Actually, I had changed a new motherboard on last year June, and my warranty is over now... it will be costly if need to change a new motherboard for this issue.

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