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iPhone audio circuit repairing

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This video mainly explains how to find the signal of iPhone 11 Pro, Pro Max microphone 1 and microphone 4

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The signals of microphones are directly connected to the large audio through the charging connector

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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 one marked with MIC means the signal of the microphone

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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 iPhone 11 Pro, Pro Max component map, circuit diagram, 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 in the circuit diagram

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After finding the connector, the pin marked MIC is the signal of the microphone

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

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Pin 1 is the data negative of the microphone,

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jump to the bitmap according to the name,

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the data negative is directly connected to the large audio U4700

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

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the data is directly connected to the big audio

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

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the bias detection signal is also directly connected to the big audio

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Pin 4 of the connector is the power supply for microphone 1,

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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 resistor R8222,

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

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Pins 5, 6, 7, and 8 of the connector are the signals of microphone 4

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Pin 5 is the data negative of microphone 4, jump to the bitmap according to the name,

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the data negative is directly connected to the big audio

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Pin 6 is the data positive of microphone 4, jump to the bitmap,

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the data is directly connected to the big audio

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Pin 7 of the connector is the bias detection of the microphone 4,

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jump to the bitmap, the bias detection is also directly connected to the large audio

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Pin 8 of the connector is the power supply for the microphone 4, jump to the bitmap

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The power supply pin passes through the fuse resistor R8225,

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and after passing through the resistor, it is connected to the large 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 corresponding functions of the microphones are not normal,

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we can measure the corresponding connector

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If the measured value is abnormal,

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we can find the components connected to the line according to the diagrams to rule out damage

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That's all for this video