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iPhone audio circuit repairing

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This video mainly explains how to find the signal of microphone 1 and microphone 4 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 signal marked MIC1 is the signal of microphone 1, and the signal marked MIC4 is the signal of microphone 4

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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, first open the iPhone11 component map, circuit diagram, and bitmap

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Find the charging connector in the component map

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and determine the position number of the charging connector in the bitmap

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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, check the pin identifications

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Pins 3, 4, 5, and 6 of the connector are the signal of microphone 1

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Pin 3 is the power supply for the microphone, jump to the bitmap according to the name

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The power supply is connected to the fuse inductor FL8254,

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and after passing through the inductor, it is connected to the large audio U4700

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Pin 4 of the connector is the bias detection of microphone 1, jump to the bitmap,

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the bias detection signal is directly connected to the large audio

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Pin 5 of the connector is the data negative of microphone 1,

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jump to the bitmap according to the name

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The data negative is connected to the fuse resistor R8252,

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And connected to the large audio after passing through the resistor

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Pin 6 of the connector is the data positive, jump to the bitmap according to the name

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The data is connected to the fuse resistor R8250,

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and connected to the large audio after passing through the resistor

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Pins 29, 30, 31, 32 of the connector are the signals of the microphone 4

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Pin 29 is the data negative, jump to the bitmap according to the name

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The data negative is connected to the fuse resistor R8262,

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

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Pins 30 of the connector is the positive data, jump to the bitmap according to the name

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The data is connected to the fuse resistor R8260,

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

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Pin 31 of the connector supplies the bias voltage of 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 FL8264,

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

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Pin 32 of the connector is the bias detection signal of microphone 4,

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jump to the bitmap according to the name,

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the bias detection signal is directly connected to the large audio

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In this way, we have searched for all the lines from microphone 1 and microphone 4 to the big audio

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If there is a problem with the functions corresponding to microphones,

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we can measure the corresponding pins

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If the line is abnormal, we can rule out the damaged components according to the diagrams

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That's all for this video