The jack and mic connect to the [https://d3nevzfk7ii3be.cloudfront.net/igi/RZkIyOHYo4SGcH1S.huge|Cirrus DAC chip Marked in Red)] Looking on the other side we can see the [https://d3nevzfk7ii3be.cloudfront.net/igi/JDdZYZfg2Tjdoxcx.huge|power lines from the MagSafe connector] which connects to the [https://d3nevzfk7ii3be.cloudfront.net/igi/rPwoxWOoYlMGMMLX.huge|main logic board].
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The jack and mic connect to the [https://d3nevzfk7ii3be.cloudfront.net/igi/RZkIyOHYo4SGcH1S.huge|Cirrus DAC chip (Marked in Red)] Looking on the other side we can see the [https://d3nevzfk7ii3be.cloudfront.net/igi/JDdZYZfg2Tjdoxcx.huge|power lines from the MagSafe connector] which connects to the [https://d3nevzfk7ii3be.cloudfront.net/igi/rPwoxWOoYlMGMMLX.huge|main logic board].
Sadly, I suspect your main logic board has a problem.
The jack and mic connect to the [https://d3nevzfk7ii3be.cloudfront.net/igi/RZkIyOHYo4SGcH1S.huge|Cirrus DAC chip Marked in Red)] Looking on the other side we can see the [https://d3nevzfk7ii3be.cloudfront.net/igi/JDdZYZfg2Tjdoxcx.huge|power lines from the MagSafe connector] which connects to the [https://d3nevzfk7ii3be.cloudfront.net/igi/rPwoxWOoYlMGMMLX.huge|main logic board].
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Sadly, I suspect your main logic board had a problem.
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Sadly, I suspect your main logic board has a problem.
The jack and mic connect to the [https://d3nevzfk7ii3be.cloudfront.net/igi/RZkIyOHYo4SGcH1S.huge|Cirrus DAC chip Marked in Red)] Looking on the other side we can see the [https://d3nevzfk7ii3be.cloudfront.net/igi/JDdZYZfg2Tjdoxcx.huge|power lines from the MagSafe connector] which connects to the [https://d3nevzfk7ii3be.cloudfront.net/igi/rPwoxWOoYlMGMMLX.huge|main logic board].
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Sadly, I suspect your main logic board had a problem.
I/O board has multiple functions:
* MagSafe interface
* USB port
* Headphone jack
* Microphone
The jack and mic connect to the [https://d3nevzfk7ii3be.cloudfront.net/igi/RZkIyOHYo4SGcH1S.huge|Cirrus DAC chip Marked in Red)] Looking on the other side we can see the [https://d3nevzfk7ii3be.cloudfront.net/igi/JDdZYZfg2Tjdoxcx.huge|power lines from the MagSafe connector] which connects to the [https://d3nevzfk7ii3be.cloudfront.net/igi/rPwoxWOoYlMGMMLX.huge|main logic board].