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2.3GHz, 2.6GHz, or 2.7GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.7GHz) with 6MB shared L3 cache.

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Only one speaker works, even after both were replaced

Hi!

I got an old MacBook Pro 15'' Mid 2012

Noticed that one speaker was not working and the other one was rather quiet, even on the max sound.

I replaced both, but nothing changed.

I swapped old ones from Left to Right, and only the left channel was working and quiet. So I suspect it's not a speaker issue but maybe something on the board.

Is there something I can look into further?

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@bogdanbirdie and once you replace the headphone jack and it should still not work, you want to check your audio amps

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@oldturkey03 - Which is why I pushed testing things first! Why waste the effort if the DAC chip is the issue.

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@danj interesting. I would not even have considered this to be a DAC issue at this point. "and only the left channel was working and quiet" would lead me to check the audio amp circuitry. I don't get the point of going for the DAC if the headphone jack is not working, and the speaker amplification is not doing what it is supposed to do. Apple sure does weird things ¯\_(ツ)_/¯

I am glad you got this covered.

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@oldturkey03 - I haven’t seen that many DAC issues (excluding liquid damage) I’ve replaced a few sockets across many systems. The key is to check if a headset failed to work. The retina series used a Cirrus DAC logic the laptop products offered a stereo amp within the chip.

Unless you are pushing some serious speakers your not likely to burn it out.

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@danj so the Cirrus DAC took over the speaker amplifiers in the Retina series? Interesting, very interesting what Apple does here. Well, like I said, glad you got this taken care off. I am out ;-)

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Speaker issues often relate to issues within the headphone jack!

Both the speakers and headphone jack share the same analog signals from the DAC chip on the logic board.

So if you have no problems with a wired headphone that tells us the line to the headphone jack is good but the little switches within the jack are not working properly that feed the speakers! Time for a new jack MacBook Pro 15" Retina (Mid 2012-Early 2013) Headphone Jack and here’s the guide MacBook Pro 15" Retina Display Mid 2012 Headphone Jack Replacement

MacBook Pro 15" Retina (Mid 2012-Early 2013) Headphone Jack图片

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MacBook Pro 15" Retina (Mid 2012-Early 2013) Headphone Jack

$9.99

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Thanks, Dan!

Is there a way to confirm this before going to replace it?

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@bogdanbirdie - Plug in a Headphone

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Thanks!

I'll try to replace it and will come back with an update :)

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@bogdanbirdie - make sure you check the system to make sure. Use the balance control to bias the headset left and right channels. If both work the jack is the issue.

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So, replacing the headphone jack did not help

Same conditions

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