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iPhone audio circuit repairing

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This video mainly explains how to find the microphone circuit and measurement points of the iPhone X model

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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, and view the connected components

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The voltage and diode value of the microphone signal can be measured at the position of the yellow point in the bitmap

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

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Let's find the microphone 2 from the power connector to the big audio

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First find the power connector in the component map,

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and confirm the position number of the power connector

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

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After searching for the power connector, the signal marked MIC2 is the signal of microphone 2

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Pins 1, 3, 5, 7, 2, and 4 of the connector are microphone signals

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Pin 1 is the data positive of microphone 2.

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Jump to the bitmap, the data is connected to the fuse inductor FL4306,

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

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Pin 3 is the data negative, jumps to the bitmap,

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the data negative is connected to the fuse inductor FL4307, and connected to the big audio

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Pin 5 of the connector is the power supply for microphone 2,

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jump to the bitmap according to the name

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The power supply pin is connected to the fuse inductor FL4305, and is connected to the big audio

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Pin 7 is the detection signal, jump to the bitmap

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The signal is connected to the coupling capacitor C4804,

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and connected to the big audio after passing through the capacitor

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Pin 2 of the connector is the I2C bus data of microphone 2, jump to the bitmap

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The bus data is connected to the fuse resistor R4309,

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and then connected to the CPU after passing through the resistor

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Pin 4 is the bus data of microphone 2, jump to the bitmap

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The bus data is connected to the fuse resistor R4308,

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and then connected to the CPU after passing through the resistor

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

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First find the earpiece connector in the component map, and confirm the position number

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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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The detection signal of microphone 3 is grounded by default, we don't need to find it

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Pin 1, pin 2, and pin 4 of the connector are the signals of microphone 3

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Pin 1 is the data negative of the microphone, jump to the bitmap

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The data negative is connected to the fuse inductor FL4641,

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and connected to the big audio after passing through the inductor

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Pin 2 of the connector is the data positive of microphone 3, jump to the bitmap

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The data is connected to the fuse inductor FL4642,

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and connected to the big audio after passing through the inductor

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Pin 4 of the connector is the power supply, jump to the bitmap according to the name

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The power supply is connected to the fuse inductor FL4640,

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and connected to the big audio after passing through the inductor

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In this way, we have searched for all the signals of the microphone

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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