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iPhone audio circuit repairing

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This video mainly explains how to find the signals of microphone 2 and microphone 3

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of the iPhone 12 Pro Max model

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Microphone 2 is connected to the large audio by the flash connector

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Microphone 3 is connected to the large audio by the earpiece connector

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Search method step 1, find the power connector or the earpiece connector in the component map

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Step 2, determine the position numbers of the connectors at the same position in the bitmap

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Step 3, search for the position numbers in the schematic diagram

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After finding the connectors, check the pin identifications of the connector

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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 to view the connected components according to the pin identification

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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 ProMax component map, circuit diagram, and bitmap

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Let's look for the signal of microphone 2 first

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Microphone 2 is connected to the large audio by the flash connector

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Find the power connector in the component map,

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and determine the position number of the power connector at the same position in the bitmap

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Then search for the position number in the schematic diagram

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After finding the power connector, the pin marked MIC means the signal of the microphone

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Pins 2, 4, 6, 8 of the connector are the signals of microphone 2

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Pin 2 of the connector is the power supply for microphone 2, jump to the bitmap,

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the power supply is directly connected to the big audio U7800,

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there is no fuse in the middle

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Pin 4 of the connector is the detection signal,

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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 6 of the connector is the data positive of the microphone,

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Jump to the bitmap according to the name,

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

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Pin 8 of the connector is the data negative of the microphone 2,

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jump to the bitmap,

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

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Let's find the microphone 3 signal

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In the component map, first find the earpiece connector,

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and determine the position number of the earpiece 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 signal marked MIC3 is the signal of microphone 3

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Pins 7, 9, and 11 of the connector are the signals of microphone 3

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Pin 7 is the power supply for microphone 3, 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 9 of the connector is the data positive of the microphone 3, jump to the bitmap,

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the data positive is also directly connected to the big audio

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Pin 11 of the connector is the data negative of the microphone 3, jump to the bitmap,

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the data negative is also directly connected to the big audio

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

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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