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iPhone audio circuit repairing

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This video mainly explains how to find the earpiece and speaker signals

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and measurement points of the iPhone 8P model

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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 iPhone 8P component map, circuit diagram, and bitmap

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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 speaker represents the signal of the earpiece speaker

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Pins 25, 27, 29, and 30 of the connector are the signal of the earpiece speaker

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Pin 25 of the connector is the positive voltage detection , jump to the bitmap according to the name

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Pin 25 is connected to the fuse resistor R4287,

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and directly connected to the earpiece power amplifier after passing through the resistor

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Pin 27 of the connector is the negative voltage detection,

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jump to the bitmap according to the name

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Pin 27 is connected to the resistor R4288,

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and connected to the earpiece power amplifier

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Pin 29 of the connector is the data negative of the earpiece, jump to the bitmap

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The data negative is directly connected to the earpiece power amplifier U5000

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Pin 30 of the connector is the data positive of the earpiece power amplifier,

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jump to the bitmap according to the name, the data is directly connected to the handset power amplifier

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If there is no sound when playing a song or making a call, we need to check the 4 pins

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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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Pins 2, 4, 46, and 48 of the connector are the bottom speaker signals

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Pin 2 is the data negative of the bottom speaker, jump to the bitmap according to the name,

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the data negative is directly connected to the speaker amplifier U4900

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

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The negative voltage detection is connected to the fuse inductor FL6482,

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and after passing through the inductor, it is connected to the speaker amplifier U4900

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Pin 46 of the connector is the positive voltage detection, jump to the bitmap according to the name

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The positive voltage detection is connected to the fuse inductor FL6480,

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And connected to the speaker amplifier U4900 after passing through the inductor

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Pin 48 of the connector is the data positive of the speaker amplifier, jump to the bitmap according to the name,

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the data is directly connected to the speaker amplifier U4900

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

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we need to check the signals of the 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