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iPhone audio circuit repairing

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This video mainly explains the working principle of iPhone hand-free calls

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When the call is connected, the MIC1 will collect the sound first,

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and send the sound to the big audio

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Step 2, big audio converts the voice analog signal into a digital signal

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and sends it to the CPU through the I2S bus

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Step 3, after the CPU receives the voice data sent by the big audio,

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it will convert through the internal module and send the voice data to the baseband through the I2S bus

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After the baseband receives the voice data,

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it sends it to the base station through the signal transceiver line

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Next, let's check the voice signal transmission line during the hands-free call

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When we connect the phone and click the hands-free button,

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the sound is first collected by the MIC4

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MIC4 sends the collected sound to big audio

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After the big audio receives the analog signal of the microphone,

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it is converted into a digital signal and sent to the CPU through the I2S audio bus

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The CPU will convert through the internal module,

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and send the voice signal to the baseband through the I2S bus

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The baseband send the signal to the base station through the signal transceiver line

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When making calls normally and hands-free,

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the tail microphone is used to collect sound

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If the other party cannot hear the sound when we make a call,

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we need to repair the line from the charge connector to the big audio,

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the line from the big audio to the CPU, and the line from the CPU to the baseband

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That鈥檚 all for this video