1

00:00:01,266 --> 00:00:04,300

In this lesson we're going to talk about the WIFI chips

2

00:00:05,300 --> 00:00:06,633

Simply understood,

3

00:00:06,900 --> 00:00:11,666

the WIFI chip is a chip that is used to connect to the wireless network in the mobile phone

4

00:00:12,466 --> 00:00:17,200

In Apple's models, the WIFI chip is integrated with the Bluetooth chip

5

00:00:22,766 --> 00:00:25,933

If the Bluetooth function and WIFI function are damaged,

6

00:00:26,166 --> 00:00:28,700

we can replace the chip with the same model

7

00:00:29,533 --> 00:00:32,733

WIFI chip in the mainboard belongs to a relatively large chip

8

00:00:34,500 --> 00:00:38,633

If it is a long board, the WIFI chip will be on the top of the mainboard

9

00:00:39,566 --> 00:00:43,400

Like models before the iPhone8P, it's in the top position

10

00:00:44,200 --> 00:00:45,900

If it is a two-layer mainboard,

11

00:00:46,266 --> 00:00:48,566

WIFI chip is usually in the lower layer

12

00:00:49,466 --> 00:00:51,933

Apple has two WIFI manufacturers,

13

00:00:52,900 --> 00:00:54,966

they are USI and Murata

14

00:00:57,400 --> 00:00:59,800

The Murata code begins with M

15

00:01:01,633 --> 00:01:04,033

You'll see it on the surface of the WIFI,

16

00:01:04,800 --> 00:01:06,566

you'll see a sign like this

17

00:01:07,333 --> 00:01:10,033

Different marks represent different manufacturers

18

00:01:10,733 --> 00:01:13,566

Like USI belongs to the low temperature WIFI,

19

00:01:16,066 --> 00:01:19,300

the Murata belongs to the middle and high temperature WIFI

20

00:01:20,366 --> 00:01:22,733

Low temperature and high temperature refers to

21

00:01:22,733 --> 00:01:26,300

the temperature that the chip is subjected during welding

22

00:01:30,033 --> 00:01:34,566

For example, let's blow this WIFI chip at 320 degrees

23

00:01:34,900 --> 00:01:38,200

low temperature WIFI chips may break when removed

24

00:01:40,300 --> 00:01:44,166

High temperature WIFI chips may not be easy to damage when removed

25

00:01:45,500 --> 00:01:48,233

The low temperature or high temperature we said

26

00:01:48,233 --> 00:01:50,933

means the temperature of the chip during welding

27

00:01:51,633 --> 00:01:55,300

After the WIFI chip is damaged, there are three common faults

28

00:01:56,366 --> 00:01:59,000

The first is that the WIFI won't turn on

29

00:01:59,533 --> 00:02:02,166

The second is that the WIFI signal is weak

30

00:02:03,100 --> 00:02:05,400

The third is to enter the password error,

31

00:02:05,666 --> 00:02:09,666

even if you entered the password is correct, it is incorrect

32

00:02:10,433 --> 00:02:14,066

If this happens, we may need to replace the WIFI chip

33

00:02:15,900 --> 00:02:20,133

When replacing the WIFI chip, first make sure the model is the same

34

00:02:22,066 --> 00:02:24,733

If you have an iPhone 6s or above,

35

00:02:25,433 --> 00:02:28,800

you need to untie it so that the WIFI can work properly

36

00:02:29,266 --> 00:02:33,566

Because the WIFI chip and some information inside the hard drive is bound together

37

00:02:34,600 --> 00:02:38,000

If you don't untie it, the WIFI chip won't work

38

00:02:41,033 --> 00:02:42,533

When we replace the chip,

39

00:02:42,700 --> 00:02:48,266

most models don't need to distinguish between low temperature WIFI and high temperature WIFI

40

00:02:50,100 --> 00:02:52,933

But in the case of the iPhone 11 pro max,

41

00:02:53,466 --> 00:02:56,133

you need to differentiate between manufacturers

42

00:02:57,000 --> 00:02:58,900

If the two chips are not the same,

43

00:02:59,333 --> 00:03:02,266

the replacement will lead to WIFI can not open

44

00:03:02,833 --> 00:03:05,766

By grinding the internal structure of the WIFI chip,

45

00:03:06,033 --> 00:03:10,700

we can see that the internal structure of low-temperature WIFI and high-temperature WIFI

46

00:03:10,700 --> 00:03:12,133

is slightly different

47

00:03:14,500 --> 00:03:18,066

This is probably the reason why low temperature and high temperature

48

00:03:18,100 --> 00:03:20,966

can not be substituted for Series 11

49

00:03:21,900 --> 00:03:26,566

Now let's go to the real thing to identify the low temperature WIFI and high temperature WIFI

50

00:03:29,033 --> 00:03:33,366

The low-temperature WIFI is made by USI, the code is USI

51

00:03:36,066 --> 00:03:37,466

Like this WIFI chip,

52

00:03:38,133 --> 00:03:40,333

USI is marked on its surface,

53

00:03:40,566 --> 00:03:43,533

indicating that it belongs to low-temperature WIFI

54

00:03:44,566 --> 00:03:47,066

This mainboard marks the beginning of M,

55

00:03:47,433 --> 00:03:49,600

it belongs to the Murata manufacturer,

56

00:03:50,033 --> 00:03:52,266

it belongs to the high temperature WIFI

57

00:03:52,633 --> 00:03:55,233

These are both iPhone7 mainboards

58

00:03:56,166 --> 00:03:59,433

Some of the same machines will use low temperature WIFI,

59

00:04:00,333 --> 00:04:03,200

while others will use high temperature WIFI

60

00:04:04,100 --> 00:04:06,633

This mainboard is an XR mainboard

61

00:04:07,200 --> 00:04:09,866

Its WIFI chip is in the middle of the mainboard,

62

00:04:11,333 --> 00:04:13,233

and it is marked with M,

63

00:04:13,600 --> 00:04:16,600

which stands for medium-high temperature WIFI

64

00:04:17,333 --> 00:04:18,766

Double-layer mainboard,

65

00:04:19,100 --> 00:04:22,033

WIFI chip is generally located in the lower layer

66

00:04:22,566 --> 00:04:24,566

This is the iPhone 11 mainboard,

67

00:04:24,733 --> 00:04:28,733

and its WIFI chip is in the middle of the lower layer, a rectangle

68

00:04:29,866 --> 00:04:35,500

WIFI chip manufacturer for USI, it represents the low temperature WIFI chip

69

00:04:37,133 --> 00:04:39,066

So that's it for this lesson