Index/
    30. How to find the positive pole of the battery
    In this lesson, we will talk about the description of the electrical leakage in the circuit diagram.
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    In this lesson,

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    we talk about the description of the electrical leakage in the circuit diagram

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    As we said before,

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    the leakage of electricity is only associated with two circuits

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    First, the circuit of the positive electrode of the battery

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    Second, the main power supply

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    Let's take a look in the circuit diagram

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    First, what lines are the positive poles of the battery connected to?

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    Ok, let's open Xinzhizao intelligent maintenance system

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    Open a circuit diagram of Xiaomi 10

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    Let's take a look at the positive pole of its battery first

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    We only need to find the battery connector

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    For example, this is the battery connector

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    Then we can open the component diagram

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    and take a look at the location code of the battery connector

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    We see that its location code is J5400

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    We double click on it and it jumps to this location we are looking for

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    We go back to the circuit diagram, we just click next

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    Ok, it's found here

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    Then the J5400 is the battery connector

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    This battery connector mainly provides a power supply, VBATT, or VBATT_CONN

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    The first and second pins of the battery connector are connected to a line,

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    which is the positive pole of the battery

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    It is divided into two paths from here,

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    one is through the resistor of two milliohms, it becomes VBATT

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    These are its filter capacitors, which are anti-static

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    Well, we're mainly looking at where the positive terminal of the battery is connected to

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    Double click VBATT, it goes to U5200_1

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    By the code name CHG, we know it is the charging chip

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    We see that the battery positive is connected to this chip, U5200

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    At the same time,

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    there are capacitors C5413 and C5458 connected to the positive electrode of this battery

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    When the mainboard has a power leakage,

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    these two capacitors may be damaged

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    Then let's see where VBATT leads to

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    We find that the line leading to the positive electrode of the battery

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    is connected to U5200 by running the circuit

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    This circuit has five capacitors,

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    C5413, C5458, C5414, C5422, C5469,

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    and an anti-static diode, CR5402

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    and one chip,

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    total of 7 components

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    If they are corroded or damaged by water,

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    they will cause the electricity leakage

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    This is the line of VBATT,

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    then the positive electrode of the battery has changed a name from here

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    Let's see which lines it leads to

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    Double click it

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    Not here, because there is J1 at the end of the name

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    Neither here

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    OK, here is a description of a touchpoint

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    We found that it actually leads nowhere

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    Then the line of the positive pole of the battery ends only from here to here

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    Okay, that's it for this lesson

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