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

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Let's find microphone 2 first

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Microphone 2 is connected to the power connector

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

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and then search for the position number in the schematic diagram

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

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Pins 11, 12, 13, 14 of the connector are microphone 2 signals

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Pin 11 is the data negative of microphone 2, jump to the bitmap

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The data negative is connected to the fuse inductor FL4307,

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

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Pin 13 of the connector is the data positive of the microphone 2, jump to the bitmap

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The data is connected to the fuse inductor FL4306,

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

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Pin 12 of the connector is the power supply, jump to the bitmap according to the name

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The pin is connected to the fuse inductor FL4305,

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

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Pin 14 of the connector is the detection signal of microphone 2, jump to the bitmap according to the name

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The detection signal is connected to the coupling capacitor C4804,

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

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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 confirm the position number

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Search for the position number in the schematic

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After searching for the earpiece connector, the signal marked MIC 3 is the signal of microphone 3

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Pins 1, 2, 4, 6 of the connector are the signals of microphone 3

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Pin 1 is the detection signal of microphone 3, jump to the bitmap according to the name

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The detection signal is connected to the coupling capacitor C4801,

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

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

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The data is connected to the fuse inductor FL4642,

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

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Pin 4 of the connector is the data negative,

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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 FL4641,

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

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Pin 6 of the connector is the power supply pin of the microphone, jump to the bitmap

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The power supply pin is connected to the fuse inductor FL4640,

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

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In this way, we complete the signal search of microphone 2 and microphone 3

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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