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

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Microphone 2 is connected to the power connector,

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and microphone 3 is connected to the earpiece connector

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First find the power connector in the component map and confirm the position number

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Then search for the position number in the schematic diagram

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After finding the connector, the signal marked MIC2 is the signal of microphone 2

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Pins 5, 7, 9, and 11 of the connector are microphone 2 signals

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Pin 5 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 FL4305, and is connected to the big audio

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Pin 7 of the connector is the detection signal, 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 big audio

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Pin 9 of the connector is the data positive of 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 big audio

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

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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 big audio

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Let's find the microphone 3

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Microphone 3 is connected to the earpiece connector

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We first find the earpiece connector in the component map,

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and then search for the position number in the schematic diagram

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In the connector, the mark MIC3 is the signal of microphone 3

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The bias detection signal of microphone 3 is grounded by default,

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we don't need to find it

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

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

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The power supply pin is connected to the fuse inductor FL4640 and connected to the big audio

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

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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 big audio

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Pin 4 of the connector is the negative data of the microphone,

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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 big audio

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

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If there is a problem with the functions corresponding to microphones 2 and 3,

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we need to find the relevant lines

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That's all for this video