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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

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of the iPhone 12, 12 Pro models

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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 iPhone12, 12Pro 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 schematic diagram

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After finding the connector, check the pin identifications

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Pins 11, 12, 13, and 14 of the connector are the signals of microphone 1

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Pin 11 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 U7800

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Pin 13 is the data negative of microphone 1, jump to the bitmap,

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the data negative is also directly connected to the big audio

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Pin 12 is the power supply pin of microphone 1, jump to the bitmap,

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the power supply pin is also connected to the big audio

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Pin 14 is the bias detection signal of microphone 1, jump to the bitmap,

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the bias detection signal is also connected to the large audio

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Pins 33, 34, 35, and 36 of the connector are the signals of the microphone 4

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Pin 33 is the data negative of the microphone, jump to the bitmap according to the name,

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the data negative is directly connected to the large audio U7800

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Pin 35 is the data positive, jump to the bitmap according to the name,

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the data positive is also connected to the big audio

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Pin 34 is the power supply, jump to the bitmap according to the name,

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the power supply pin is directly connected to the big audio

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Pin 36 is the detection signal of microphone 4, jump to the bitmap,

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and the detection signal 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 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