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According to the schematic block diagram,

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we have roughly understood the working process of the standby circuit

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How do we find these signals in the drawings?

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First, let's open the bitmap software

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If we want to find the iPhone7 model,

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we 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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According to the schematic block diagram, the power supply

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is first connected by the battery holder to the charging tube and charging chip

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We first find the code of the battery holder on the component map

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Then go to the circuit diagram and search for it

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The current page is the identification of the battery connector in the drawing

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We see battery powered here,

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It will connect to the charging tube and charging chip

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Let's search for PP_BATT_VCC in the circuit diagram,

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and look at the first column of the results list,

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After the battery is powered, it will be connected to the TP0415

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TP refers to the test point, not the component we are looking for

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look at the second column

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After the signal comes, it will be connected to the Q2101 charging tube

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The line further forward will be connected to the U2101 charging chip

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Then U2101 is the charging chip

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If you don't know the connected component,

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you can go to the bitmap to check its location

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Then go to the component map to find the identification

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of the component in the same position

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We can see that U2101 is the charging chip

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Q2101 and U2101 are the two components

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we need to find in the schematic block diagram

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After these two components receive power from the battery,

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they will convert the main power supply of PP_VDD_MAIN through their internal diodes

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How does it convert? Let's take a look at the circuit diagram

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Let's first look at how the charging tube converts the main power supply

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After the battery is powered, it will reach the C1 C2 C3 pads of the charging tube

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and connected to the positive pole of the diode inside the chip

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Before the diode does not conduct, the negative pole has no voltage

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At this time, the positive voltage is greater than the negative voltage

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The power supply from the battery is conducted through the diode

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Then, it will be connected to the five pads of A2 A3 B1 B2 B3 of the chip

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The converted power supply will have a name identification, PP_VDD_MAIN

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This is the main power supply

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Let's take a look at how the charging chip converts the main power supply

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After the battery is powered, it will reach the 4 pads of A1 B1 D1 C1 of the charging chip,

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and then reach the positive pole of the diode inside the charging chip

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We can't see the diode integrated inside the charging chip

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The negative power supply is connected to the following circuit,

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and its power supply name is called PP_VDD_MAIN

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Well, this is how the charging tube and charging chip

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in the circuit diagram convert the main power supply

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How do we find the components of the main power supply connection in the real phone?

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We only need to check the bitmap according to the English name of the main power supply

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For example, like this, put the mouse here,

right-click "find bitmap signal"

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All the yellow positions in the bitmap belong to the

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main power supply components,

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including many capacitors and chips