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According to the schematic block diagram,

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the charging tube and the charging chip will reach many chips

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after the main power supply is converted

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In addition, the vibration chip, speaker amplifier, and receiver amplifier

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will also convert the power supply to prepare for future circuit work

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How to find the power supply of the rear stage conversion in the circuit diagram?

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We open the bitmap software and find the iphone directory,

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open the circuit diagram of the iPhone7 model

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Then find the iPhone7 bitmap and component map from the bitmap directory

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In the component map we find the code of receiver amplifier,

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and go to the circuit diagram to search for it,

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then we can see the display of the receiver amplifier in the circuit diagram

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We can see that PP_VDD_MAIN on the left is the main power supply

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The current reaches the A2 B2 pads of the receiver

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amplifier through the boost inductor

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The four pins A1 B1 C1 D1 on the right side of the receiver amplifier

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are the power supply positions for the receiver amplifier conversion

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This power supply will not provide working voltage for other chips.

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Only a few capacitors are connected to the output power supply,

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and no chips are connected

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We can view the connected components through the bitmap

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In the bitmap, we only see a few capacitors,

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and no other chips are connected