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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 X model

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

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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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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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There are 4 microphones in the block diagram,

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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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When checking the maps, first open the iPhone X component component map, circuit diagram, and bitmap

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Find the charging connector in the component map, and confirm the position number

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Then search for the position number of the charging connector in the schematic diagram

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After finding the connector, let's check the logo first,

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the one marked MIC1 is the signal of microphone 1

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Pins 27, 29, 31, 33, 35, 37 of the connector are the signals of microphone 1

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Pin 27 is the data positive of the microphone, jump to the bitmap according to the name

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The data is connected to the fuse inductor FL6450, and is connected to the big audio U4700

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Pin 29 of the connector is data negative, jump to the bitmap

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The data negative 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 31 of the connector is the bias detection signal, jump to the bitmap

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The bias voltage detection is connected to the coupling capacitor C4803,

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

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Pin 33 of the connector is the power supply for microphone 1,

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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 FL6454,

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

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Pin 35 is the I2C bus data of microphone 1, jump to the bitmap according to the name

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The bus data 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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Pin 37 is the microphone I2C bus clock, jump to the bitmap according to the name

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The data pin is connected to the fuse resistor R6465,

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and connected to the CPU after passing through the resistor

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Let's find the signal of microphone 4

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Pins 9, 11, 13, and 15 of the connector are the signals of the microphone 4

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Pin 9 is the power supply

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

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Pin 11 of the connector is the detection signal of microphone 4, jump to the bitmap

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The detection signal is connected to the coupling capacitor C4802,

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

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Pin 13 is the data negative of the microphone, jump to the bitmap according to the name

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The data negative is connected to the fuse inductor FL6462,

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

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Pin 15 of the connector is the data positive of microphone 4, jump to the bitmap

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The data is connected to the fuse inductor FL6460,

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

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If there is a problem with the function corresponding to the microphone,

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we need to find the corresponding microphone,

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find the circuit-related components and eliminate the damaged components

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That's all for this video