1

00:00:00,133 --> 00:00:04,366

In this class, we talk about the related lines of the main power supply leakage,

2

00:00:04,366 --> 00:00:08,000

and how to find it in the circuit diagram and how to repair it

3

00:00:08,166 --> 00:00:10,833

The main power supply line is generally the main power supply,

4

00:00:10,966 --> 00:00:15,133

the display chip, WIFI chip and the radio frequency, etc.

5

00:00:16,133 --> 00:00:16,933

In general,

6

00:00:16,933 --> 00:00:20,366

it is the components on the line to which the main power supply is connected,

7

00:00:21,000 --> 00:00:22,766

including capacitors and chips

8

00:00:23,233 --> 00:00:25,900

Log in to Xinzhizao's intelligent maintenance system,

9

00:00:28,700 --> 00:00:31,133

we find the circuit diagram of Xiaomi10,

10

00:00:31,166 --> 00:00:33,366

and the component map 1 and 2

11

00:00:38,933 --> 00:00:41,566

We find the main power supply from the battery socket

12

00:00:45,966 --> 00:00:49,266

We search for J5400 in the circuit diagram

13

00:00:49,400 --> 00:00:51,000

We know that the positive pole of the battery

14

00:00:51,033 --> 00:00:55,166

is the first and second pins of the battery holder J5400

15

00:00:56,366 --> 00:01:01,166

The positive electrode of the battery forms VBATT through a resistor

16

00:01:03,166 --> 00:01:07,266

We double click it, it leads to the charging chip U5200

17

00:01:08,433 --> 00:01:11,733

The positive electrode of the battery supplies power to the charging chip,

18

00:01:11,933 --> 00:01:14,633

the internal MOS tube of the charging chip is turned on,

19

00:01:14,933 --> 00:01:16,833

and a main power supply is output

20

00:01:19,500 --> 00:01:22,033

This is how the main power supply is generated

21

00:01:26,933 --> 00:01:29,033

We open the bitmap of Xiaomi10,

22

00:01:29,133 --> 00:01:31,066

then switch to the circuit diagram,

23

00:01:38,233 --> 00:01:42,600

select VPH_PWR, right-click,

24

00:01:43,066 --> 00:01:44,800

click to find the bitmap signal,

25

00:01:45,100 --> 00:01:46,433

it jumps to the bitmap,

26

00:01:46,633 --> 00:01:50,166

we can see all the chips and capacitors leading to the main power supply

27

00:01:50,666 --> 00:01:53,033

This is the convenience brought by the bitmap,

28

00:01:53,366 --> 00:01:56,900

we can see all the components connected to the main power supply at a glance

29

00:01:58,266 --> 00:01:59,233

In this bitmap,

30

00:01:59,633 --> 00:02:04,366

the yellow highlighted VPH_PWR is the main power supply

31

00:02:08,800 --> 00:02:11,566

It leads to the chip U0900,

32

00:02:11,700 --> 00:02:17,166

and there are two capacitors C0907, C0906

33

00:02:18,633 --> 00:02:24,800

And L0901, C1443, and chip U1301

34

00:02:25,633 --> 00:02:30,066

It leads to the chip U1801 and several capacitors around it,

35

00:02:30,200 --> 00:02:42,166

C1832, C1831, C1809, 1823, C1806, C1810 and C1811

36

00:02:42,533 --> 00:02:47,533

It also leads to the chip U2001 and the three capacitors around it

37

00:02:48,133 --> 00:02:53,800

It leads to this socket J6501, and the capacitor C6589

38

00:02:54,133 --> 00:02:57,833

and the chip U4800, and a capacitor next to it

39

00:02:58,333 --> 00:03:01,400

It also leads to the chip U4700,

40

00:03:01,666 --> 00:03:03,700

and the nine capacitors around it

41

00:03:06,533 --> 00:03:10,866

It leads to the chip U7302 and two capacitors around it

42

00:03:11,466 --> 00:03:16,200

It also leads to the chip U6005 and two capacitors around it

43

00:03:18,233 --> 00:03:21,433

This is the side of the socket, CPU and hard disk

44

00:03:21,866 --> 00:03:23,666

Okay, that's it for this lesson