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iPhone audio circuit repairing

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This video mainly explains how to find the earpiece and bottom speaker signal of iPhone 12 and 12Pro models

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Search method step 1, find the handset or charging connector in the component map,

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and confirm the position number

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Step 2, search for the position number in the circuit diagram

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Step 3, after finding the connector, check the pin identification of the connector

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The signal marked SPKRAMP means the signal of the earpiece or speaker

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Step 4, jump to the bitmap to view the connected components

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The voltage and diode value of the signal can be measured at the position of the yellow point in the bitmap

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When checking the maps, first open the component maps, circuit diagrams, and bitmaps of iPhone12 and 12Pro

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First, find the data signal from the earpiece connector to the earpiece amplifier

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Find the earpiece connector in the component map and confirm the position number,

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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 SPKRAMP represents the signal of the earpiece speaker

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Pins 19 and 21 of the connector are the handset data negative

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Jump to the bitmap according to the name,

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and the data negative is directly connected to the earpiece amplifier U8100

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Pins 20 and 22 of the connector are positive data of the handset

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Jump to the bitmap according to the name, the data is also directly connected to the earpiece amplifier,

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without fuse in the middle

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Pin 23 of the connector is the negative voltage detection of the data

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Jump to the bitmap according to the name, the data negative is connected to the fuse resistor R11024,

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and connected to the earpiece amplifier after passing through the resistor

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Pin 24 of the connector is the positive voltage detection of the handset data

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Jump to the bitmap according to the name, the pin is connected to the resistor R11021,

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and after the resistor is connected to the earpiece amplifier U8100

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If there is no sound from the earpiece when playing a song or making a call,

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we need to find the corresponding signals

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If the signal value is found to be abnormal,

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

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Let's find the bottom speaker signal from the charging connector to the speaker amplifier

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First find the charging connector in the component map, and confirm the position number

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Then search for the position number of the charging connector in the schematic diagram

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After finding the connector, the pin marked SPKRAMP represents the signal of the bottom speaker

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Pin 39 of the connector is the data negative of the bottom speaker

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Jump to the bitmap according to the name,

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and the data negative is directly connected to the speaker amplifier U8000

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Pin 40 of the connector is the data positive of the bottom speaker

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Jump to the bitmap according to the name, the data is also directly connected to the speaker amplifier U8000

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Pin 37 of the connector is the data negative voltage detection of the bottom speaker

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Jump to the bitmap according to the name, the pin is connected to the fuse resistor R11280,

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and after passing through the resistor, it is connected to the speaker amplifier U8000

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Pin 38 of the connector is the data positive voltage detection of the bottom speaker

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Jump to the bitmap according to the name, the signal is connected to the resistor R11282,

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and after passing through the resistor, it is connected to the speaker amplifier

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If there is no sound from the bottom speaker when playing a song,

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we need to find the corresponding signal

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If the measured value is abnormal,

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we can check the connected components according to the diagrams to rule out damage

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That's all for this video