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iPhone audio circuit repairing

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This video mainly explains the principle of iPhone voice memo recording

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Voice Memo recording works the same on the iPhone 8 through iPhone 12 ProMax models

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The first step of the recording principle,

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when the recording button is clicked,

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The MIC4 will work first, and collect the sound,

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and the collected sound will be sent to the big audio

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Step 2, after the big audio receives the analog signal collected by the microphone,

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it is converted by the internal circuit and sent to the CPU through the I2S bus

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Step 3, after the CPU receives the digital voice signal,

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it converts it through the internal module,

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and then sends it to the hard disk through the PCIE bus

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When we press the stop recording button, the CPU stops data transmission,

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and the recording storage is completed

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When the voice memo of the iPhone is unavailable,

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or there is noise when recording,

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we need to check the line from the MIC4 to the big audio,

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and the line from big audio to the CPU

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That's all for this video