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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,

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check the connector pins, the MIC is the microphone signal

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Step 4, jump to the bitmap according to the pin identification, 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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When checking the maps, we first open the iPhone 8p component map, circuit diagram, bitmap

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There are 4 microphones in the block diagram, which are connected to different connectors

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Let's find the MIC 1 and MIC 4 of the charging connector first

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Find the charging connector in the component map,

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and then search for the position number of the charging connector in the drawing

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Pins 7, 9, 11, 16 of the connector are microphone signals

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Among them, pin 7 and pin 9 are microphone data,

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and pin 11 is power supply for the microphone

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Pin 16 is the microphone detection signal,

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pin 13 and pin 15 are the microphone I2C detection bus

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Pin 7, jump to the bitmap according to the name

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Pin 7 is connected to the fuse inductor FL6452,

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

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Pin 9, jump to the bitmap according to the name

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The signal is connected to the fuse inductor FL6450,

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

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Pin 11, microphone power supply, jump to the bitmap according to the name

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The power supply passes through the fuse inductor FL6454,

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and connects to the large audio

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Pin 16 of the connector is for microphone bias detection,

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jump to the bitmap according to the name

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The bias detection signal is connected to the large audio after passing through the coupling capacitor C4803

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Pin 13 of microphone 1 is the I2C bus,

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which is directly connected to the CPU after passing through the fuse resistor R6456

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Pin 15 is the I2C data pin, which is connected to the fuse resistor R6466,

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and then connected to the CPU after passing through the resistor

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Let's find the microphone 4 signals

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Pins 5, 10, 12, and 14 of the connector are the signals of the microphone 4

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Pin 5, for microphone bias detection, jump to the bitmap according to the name

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The bias voltage detection is connected to the coupling capacitor C4802,

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and connected to the large audio

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Pin 10 of the connector is the power supply for the microphone 4,

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jump to the bitmap according to the name

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The power supply is connected to the fuse inductor FL6464,

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which is connected to the large audio after passing through the inductor

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Pin 12 of the connector is the data positive of the microphone,

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and the data is connected to the fuse inductor FL6460,

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

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Pin 14 is the microphone data negative, it is connected to the fuse inductor FL6462,

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and connected to the large audio after passing through the inductor

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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