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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 XS 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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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 points in the bitmap

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

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Both microphones 1 and 4 are connected to the charging connector

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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 schematic diagram

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After finding the charging connector, the connector marked MIC 4 is the signal of microphone 4,

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and the one marked MIC 1 is the signal of microphone 1

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Pins 19, 21, 16, 18 of the connector are the signals of microphone 1

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Pin 16 is for microphone bias detection, jump to the bitmap according to the name

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

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and connected to the big audio after passing through the capacitor

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Pin 18 of the connector is the data positive of microphone 1, jump to the bitmap

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The data is connected to the fuse inductor FL6450,

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

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Pin 19 is the power supply for the microphone 1, jump to the bitmap

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The power supply is connected to the fuse resistor R6432,

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

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Pin 21 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 inductor FL6452,

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

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Pins 4, 6, 8, 9, 11 of the connector are the signals of the microphone 4

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Pin 6 is the power supply, jump to the bitmap according to the name

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The power supply pin 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 8 of the connector is the data negative, jump to the bitmap

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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 9 of the connector is the detection signal, 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 11 is the data positive of the 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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In this way, we will search for all the lines of XS model microphone 1 and microphone 4

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That's all for this video