1

00:00:01,300 --> 00:00:03,600

after removing the charging tube charging tube

2

00:00:03,700 --> 00:00:05,766

speaker amplifier and boost tube

3

00:00:05,966 --> 00:00:08,799

receive the rear stage conversion voltage normal

4

00:00:14,666 --> 00:00:16,199

after removing the charging tube

5

00:00:16,200 --> 00:00:18,066

let's test whether the main power supply

6

00:00:18,066 --> 00:00:19,266

still has voltage

7

00:00:34,400 --> 00:00:37,200

we see that the main power supply voltage still normal

8

00:00:37,566 --> 00:00:38,333

it means that

9

00:00:38,333 --> 00:00:41,066

challenge trip will also convert the main power supply

10

00:00:46,733 --> 00:00:48,099

after removing the charge chip

11

00:00:48,100 --> 00:00:48,700

let's test

12

00:00:48,700 --> 00:00:51,066

whether the main power supply voltage is normal

13

00:00:59,900 --> 00:01:03,200

now the main power supply Volt is about 3.7 volts

14

00:01:03,466 --> 00:01:05,999

it has about a 0.5 volt drop

15

00:01:06,166 --> 00:01:09,466

because it's adjustable power supplies 4.2 volts

16

00:01:17,933 --> 00:01:20,166

after removing the charge tube and the charge tip

17

00:01:20,166 --> 00:01:21,966

let's test whether the main power supply

18

00:01:21,966 --> 00:01:23,199

still has voltage

19

00:01:27,166 --> 00:01:29,599

let's matter the battery terminal voltage first

20

00:01:30,966 --> 00:01:32,066

okay it's normal

21

00:01:40,300 --> 00:01:42,500

but there is no voltage at the main power supply

22

00:01:42,500 --> 00:01:44,900

terminal it shows that the main power supply

23

00:01:44,900 --> 00:01:47,666

is converted through the charging tube and charging tip

24

00:01:53,066 --> 00:01:55,933

next we remove the boost chip and the audio chip

25

00:01:55,933 --> 00:01:57,866

and then test whether the power supply

26

00:01:57,866 --> 00:01:59,966

converts by it still has voltage

27

00:02:05,333 --> 00:02:06,799

when the boost chip is in

28

00:02:07,266 --> 00:02:09,866

the boost voltage is 4.2 volts

29

00:02:10,066 --> 00:02:13,399

then after we remove the boost chip there is no voltage

30

00:02:19,200 --> 00:02:22,266

after the audio trip is removed there is no voltage

31

00:02:29,066 --> 00:02:31,499

we can marry the vibration chip next to it

32

00:02:32,700 --> 00:02:34,000

there's no voltage

33

00:02:46,066 --> 00:02:48,566

we just removed charging tube charging chip

34

00:02:48,766 --> 00:02:50,999

speaker amplifier and boost chip

35

00:02:51,166 --> 00:02:52,899

and found that old power supply

36

00:02:52,900 --> 00:02:55,333

for the real stage conversion has no voltage

37

00:02:58,600 --> 00:03:01,733

the iPhone stand by circuit is the same as principle