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Model A1297 Unibody: Early 2009, Mid 2009, Mid 2010, Early 2011 & Late 2011

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Why no sound except when using a usb adapter on a late 2011 A1297

There is no available sound for the internal speakers nor microphone jack.

The icon for sound when tapping the f11 or f12 keys has the slash for no sound unless the ubs adapter is plugged in.

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Judging by the 2 responses, I may not have made clear the problem I have

There is no internal sound of any kind nor does the mic jack for external output sound work at all.

The usb adapter is the only way there is any sound

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To add a bit more to Fenando’s answer your jack has a set of switches as you can see here

Block Image

So when the plug is inserted the internal speaker connection is dropped. In addition the digital output is enabled which is the source of the Red light coming from the jack.

Sometimes the contacts get out of alignment or dirty which is what I suspect you are facing here.

Update (11/03/2019)

At this point I think you’ll need to pull the logic board out to inspect it for corrosion or other liquid damage around the DAC chip which is located on the back side of the logic board (marked RealTek) MacBook Pro 17" Unibody Logic Board Replacement. You might need a new logic board.

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( 1 ) This old models have the optical audio inside of the audio jack, if is dirty will recognize a optical output. ( 2 ) If you are using a external audio adapter make sure that you are sending the audio to the right device on your settings. ( 3 ) Audio Card malfunction or Liquid Damage on the Logic Board.

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Dan zal eeuwig dankbaar zijn.
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