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iPhone audio circuit repairing

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This video mainly explains how to find the signals of microphone 1

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and microphone 4 of the iPhone 12 Pro Max model

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

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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 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 12 Pro Max component map, circuit diagram, and 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 schematic 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 4

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Pin 1 is the data positive of microphone 4, jump to the bitmap according to the name,

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the data is directly connected to the big audio U7800

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Pin 2 of the connector is the data negative of the microphone 4, jump to the bitmap,

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the data negative is directly connected to the big audio,

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there is no fuse in the middle

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Pin 3 of the connector is the power supply, jump to the bitmap according to the name,

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the power supply pin is connected to the big audio, and there is no fuse in the middle

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Pin 4 of the connector is the detection signal, jump to the bitmap according to the name,

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the detection signal is also directly connected to the big audio

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Pins 31, 33, 38, and 40 of the connector are the signals of microphone 1

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Pin 31 is the data positive of microphone 1, jump to the bitmap,

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the data is directly connected to the big audio

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Pin 33 is the detection signal of microphone 1, jump to the bitmap according to the name,

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the detection signal is also directly connected to the big audio

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Pin 38 of the connector is the data negative of the microphone 1, jump to the bitmap,

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the data negative is also connected to the big audio, there is no fuse in the middle

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Pin 40 of the connector is the power supply pin, jump to the bitmap according to the name,

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the power supply pin is also connected to the big audio

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In this way, we have completed the line search of microphone 1 and microphone 4

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If the corresponding function is not normal,

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it is necessary to measure the corresponding connector

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If the value of the connector is abnormal,

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check the components connected to the line according to the diagram to rule out damage

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That's all for this video