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iPhone audio circuit repairing

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This video mainly explains how to find the earpiece and speaker signals of iPhone X 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 iPhone X 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 SPKRAMP represents the signal of the earpiece speaker

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Pins 21 and 22 of the connector are the voltage detection signals

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Pins 23, 24, 25, 26 of the connector are the handset data negative

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Pins 31, 32, 34 of the connector are handset data positive

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Pin 21 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 R4633,

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and connected to the earpiece amplifier U5000 after passing through the resistor

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Pin 22 of the connector is the negative 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 R4634,

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and connected to the earpiece amplifier after passing through the resistor

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Pins 23, 24, 25, 26 of the connector are the handset data negative

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Jump to the bitmap according to the name,

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the data negative goes directly to the earpiece amplifier without fuse in the middle

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Pins 31, 32, 34 of the connector are positive data of the handset

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Jump to the bitmap, the data is also connected to the earpiece amplifier, without fuse in the middle

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If there is no sound from the handset when making calls or playing songs,

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we need to find the signals connected to the handset

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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 45 and 46 of the connector are the bottom speaker data negative

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Jump to the bitmap

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The data negative is connected to the speaker amplifier U4900

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Pin 1 is the data positive of the bottom speaker

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Jump to the bitmap, the data is connected to the lower speaker amplifier U4900

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Pin 3 of the connector is the data positive voltage detection

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Jump to the bitmap, the data is connected to the inductor FL6480,

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after passing through the inductor, it is connected to the speaker amplifier through the middle connection point

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Pin 5 of the connector is the bottom speaker data negative voltage detection

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Jump to the bitmap, the data is connected to the fuse inductor FL6482,

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

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through the middle connection point

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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 signals of the speaker amplifier

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If the measured value is abnormal, we need to find the related components of the line to rule out damage

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That's all for this video