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Repair guides for the MacBook.

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No sound out of left and right internal speaker?

I have the 2006 Core 2 Duo version of the MacBook (A1181), and my problem is I'm not getting any sound from the internal left and right speakers. I get sound from the middle speaker, but not the left or the right one. I have opened it up, and it seems like all speakers are plugged in correctly. I don't have the "red glow" problem (stuck on optical). What could be the problem?

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We'd like to know first if the issue is software or hardware. Could you boot the MB from an external source and then try the sound system ?

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Like, boot it from an external HDD? Alas, I don't have one...I did just format my entire computer and re-install Lion, but it still has no sound from the outer most rear speakers.

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Look at the audio out port and see if you see a red light shining in it. If so we need to turn it off. I will give instructions on how to do this if you need it.

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I did mention in my question, it can't be the optical problem, there's no red light. Plus, one of the internal speakers does work.

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please tell me

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I have the same Macbook with the same problem. Booted in windows all speakers work fine ! Booted with fresh original system-installs 10.4.3 thru 10.4.11 on a firewire-volume only the center-speaker works. I´ve tried fixing smc-firmware, but with a working firmware checkout it won´t install. This is the first post I´ve found on the subject.

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Problem solved today ! .. after months of seeking a solution.

I thought, I´d give it another try with installing systems onto an external volume attached to the mac. Lion - didn´t work - installation stalled about 6 times. Snow leopard - wouldn´t even boot from the installer DVD - tried about 5 times.

As you can see, i just tried and tried again, without being able to get a newer system than 10.4.11 installed (i haven´t gotten to leopard yet..).

But - here it comes : Speakers are back to normal !

And nothing has changed, really .. I didn´t have to mess with my running system or hardware. (Black Macbook 2,1 Core 2 Duo 2.0)

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Evan será eternamente grato(a).
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