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iPhone audio circuit repairing

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This video mainly explains how to find the signals of the iPhone 11 earpiece and bottom speaker

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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 iPhone11 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, 22, 25 of the connector are the positive data of the handset

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Jump to the bitmap, the data is connected to the earpiece amplifier U5002, without fuse in the middle

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Pin 18 of the connector is the data negative, jump to the bitmap,

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the pin is also directly connected to the earpiece amplifier

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Pin 2 of the connector is the negative voltage detection of the handset data

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Jump to the bitmap, the signal passes through the fuse resistor R7934 and then connects to the earpiece amplifier

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Pin 4 of the connector is the positive voltage detection of the handset data

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Jump to the bitmap, the positive signal is connected to the fuse resistor R7933,

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

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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 35 is the data negative of the bottom speaker

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Jump to the bitmap, the data negative is connected to the bottom speaker amplifier U4902

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Pin 1 of the connector is the negative voltage detection signal

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Jump to the bitmap, the signal is connected to the fuse resistor R8280,

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and after passing through the resistor, it is connected to the speaker amplifier U4902

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Pin 36 of the connector is the data positive signal

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Jump to the bitmap, the data is connected to the speaker amplifier U4902, without fuse in the middle

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Pin 2 of the connector is the data positive voltage detection signal

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Jump to the bitmap, the signal is connected to the fuse resistor R8282,

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after passing through the resistor, it is connected to the speaker amplifier U4902

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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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That's all for this video