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iPhone audio circuit repairing

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This video mainly explains how to find the receiver signals of iPhone 11 Pro, 11 Pro Max

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Because the speaker power amplifier chip is on the charging cable, not on the mainboard

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So we don't need to look for the line from the charging connector to the speaker amplifier

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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 map, circuit diagram,

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and bitmap of iPhone 11 Pro and 11 Pro Max

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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 29, 30, 33 of the connector are the data positive of the handset

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Jump to the bitmap, the data is connected to the earpiece amplifier U5000 through the middle connection point

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Pins 1, 3, and 5 are the data negative for the earpiece power amplifier

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Jump to the bitmap, the data negative is connected to the handset amplifier U5000

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through the middle connection point

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Pin 6 of the connector is the negative voltage detection of the handset

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Jump to the bitmap according to the name, the pin is connected to the fuse resistor R7934,

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and after passing through the resistor,

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it is connected to the earpiece power amplifier through the middle connection point

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Pin 8 of the connector is the positive voltage detection of the handset

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Jump to the bitmap according to the name, the pin is connected to the fuse resistor R7933,

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and after passing through the resistor,

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it is connected to the earpiece power amplifier through the middle connection point

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If there is no sound from the earpiece when playing a song or answering 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