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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 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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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 point in the bitmap

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

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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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This identification is wrong, it should be J6500

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We search for J6500 in the schematic diagram

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After finding the connector, the signal marked MIC4 is the signal of microphone 4,

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and the signal marked MIC1 is the signal of microphone 1

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Pins 26, 28, 30, 32 of the connector are the signals of microphone 1

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Pin 26 is the data negative of microphone 1, jump to the bitmap

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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 U4700

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Pin 28 of the connector is the data positive, 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 30 of the connector is the detection signal of microphone 1,

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jump to the bitmap according to the name

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The detection signal is connected to the coupling capacitor C4803,

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

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Pin 32 of the connector is the power supply pin, jump to the bitmap

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The power supply is connected to the fuse inductor FL6454,

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

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Pins 6, 8, 10, 12 of the connector are the signals of the microphone 4

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Pin 6 is the bias detection signal of the microphone,

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jump to the bitmap according to the name

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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 8 of the connector is the power supply pin,

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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 10 of the connector is the negative data pin,

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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 FL6462,

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

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Pin 12 of the connector is the data positive of 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 have searched for all the signals of microphone 1 and microphone 4

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If the speech function is not normal,

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we need to measure the corresponding microphone signal

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That's all for this video