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iPhone audio circuit repairing

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This video mainly explains how to find the microphone circuit and measurement point of the iPhone 8P model

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The iPhone has 4 microphones, and the microphone search method is the same

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We will take the charging connector MIC1 as an example to explain the search method

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Search method step 1, find the microphone connector in the component map and confirm the position number

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Step 2, search for the position number of the connector in the schematic diagram

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Step 3, after searching for the connector, check the connector pins,

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the MIC is the microphone signal

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Step 4, jump to the bitmap according to the pin identification,

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and view the connected components

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The voltage and diode value of the microphone signal can be measured

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at the position of the yellow point in the bitmap

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Now look for the microphone 2 signal from the boot seat to the big audio

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First find the switch connector in the component map,

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and then search for the switch connector in the circuit diagram

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After searching for the connector, the mark MIC2 refers to the signal of microphone 2

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Pins 1, 3, 5, 9, 11, and 13 of the connector are microphone signals

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Pin 3 and pin 5 are the I2C detection signal of microphone 2

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Pin 3, jump to the bitmap according to the name

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The signal is connected to the CPU after passing through the fuse resistor R4308

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Pin 5, jump to the bitmap according to the name

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Pin 5 is connected to the CPU after connecting the fuse resistor R4309

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Pins 9 and 11 are the positive and negative of the microphone data

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Pin 9, jump to the bitmap according to the name

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The signal is connected to the large audio after connecting the fuse inductor FL4306

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Pin 11, jump to the bitmap according to the name

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The signal is connected to the large audio after connecting the fuse inductor FL4307

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Pin 1 of the connector is the power supply pin of the microphone

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Jump to the bitmap according to the name,

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the power supply of the microphone is connected to the fuse inductor FL4305,

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and after passing through the inductor, it is connected to the large audio

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Pin 13 of the connector is the bias detection signal of microphone 2

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Jump to the bitmap according to the name,

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the bias detection signal is connected to the coupling capacitor C4804,

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and after passing through the capacitor, it is connected to the large audio

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Let's find the microphone 3 signal from the earpiece connector to the big audio

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First find the earpiece connector in the component map,

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and then search for the position number of the earpiece connector in the schematic diagram

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After finding the connector, the signal marked MIC3 is the signal of microphone 3

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Pins 33, 35, 36 of the connector are microphone 3 signals

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Pin 33 is the power supply of the microphone, jump to the bitmap according to the name

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The power supply of the microphone passes through the fuse inductor FL4280,

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and after passing through the inductor, it is connected to the large audio

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Pin 35, the microphone data positive, jump to the bitmap according to the name

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Pin 35 is connected to the fuse inductor FL4282,

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and after passing through the inductor, it is connected to the large audio

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Pin 36 is the negative of the microphone data, jump to the bitmap according to the name

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The data negative is connected to the fuse inductor FL4281,

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and after passing through the inductor, it is connected to the large audio

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The monitoring signal of the microphone is grounded by default

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All the microphone signals of iPhone 8P have been searched

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If the speech function is not normal, we need to measure the corresponding microphone signal

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That's all for this video