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iPhone audio circuit repairing

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This video mainly explains how to find the signals of microphone 2 and microphone 3 of iPhone 11 models

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Search method step 1, find the charging connector in the iPhone 11 component map

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determine the position number of at the same position in the bitmap

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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 one marked with MIC means the signal of the microphone

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Step 4, jump to the bitmap according to the pins, and view the connected components

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

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When checking the maps, we first open the iPhone 11 component map, circuit diagram, bitmap

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Let's look for the signals of microphone 2 first

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Microphone 2 is connected to the power connector, so we first find the power connector in the component map

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Determine the position number of the power connector in the bitmap

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Then search for the position number in the circuit diagram

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After finding the connector, the pin marked MIC is the signal of the microphone

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Pins 3, 5, 7, and 9 of the connector are the signals of the microphone 2

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Pin 3 is the data negative of microphone 2, jump to the bitmap according to the name

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The data negative is connected to the fuse inductor FL7707

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After passing through the inductor, the signal is connected to the large audio through the middle connection point

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Pin 5 of the connector is the data positive, jump to the bitmap according to the name

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The data is passing through the fuse inductor FL7706,

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

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through the middle connection point

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Pin 7 of the connector is the power supply for microphone 2, jump to the bitmap

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The power supply pin passes through the fuse inductor FL7705,

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and then connects to the large audio through the middle connection point

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Pin 9 of the connector is the bias detection signal, jump to the bitmap

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The bias detection signal is connected to the large audio by the middle layer connection point

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Let's find the signals of microphone 3

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Microphone 3 is connected to the earpiece connector

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Find the earpiece connector in the component map, and then determine the position number in the bitmap

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Search for the earpiece position number in the schematic diagram

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After finding the connector,

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the mark MIC3 of the connector pin is the signal of microphone 3

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Pins 10, 12, 14, and 16 of the connector are the signals of microphone 3

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Pin 10 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 FL7942,

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and directly connected to the large audio after passing through the inductor

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Pin 12 is the data negative of microphone 3, jump to the bitmap

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The data negative is connected to the fuse inductor FL7941,

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and connected to the large audio after passing through the inductor

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Pin 14 of the connector is the bias detection signal

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Jump to the bitmap according to the name, and the bias detection signal is directly connected to the large audio

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Pin 16 of the connector is the power supply pin, jump to the bitmap according to the name

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The power supply pin is connected to the fuse inductor FL7940,

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and directly connected to the large audio after passing through the inductor

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In this way, we have searched for all the signals of microphone 2 and microphone 3

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If the functions corresponding to microphone 2 and microphone 3 cannot be used,

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you can measure the corresponding connector

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When the measured value is abnormal, we can view the connected components through the diagrams,

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eliminate damage or replace components

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That's all for this video