1

00:00:03,766 --> 00:00:06,100

Next we are ready to install it back

2

00:00:06,666 --> 00:00:07,900

Clean the pads first

3

00:00:15,000 --> 00:00:17,600

Before welding, first check pads

4

00:00:17,900 --> 00:00:21,466

Because when we scraped the glue, we scraped the copper exposed

5

00:00:21,600 --> 00:00:23,366

For example,like this pad

6

00:00:24,333 --> 00:00:25,800

It's a very rounded pad

7

00:00:26,066 --> 00:00:28,100

It has no connection to the periphery

8

00:00:28,866 --> 00:00:34,400

Once the edge of this position is exposed to copper, it must be replenished with green oil

9

00:00:34,466 --> 00:00:37,066

The one next to it, for example, like this

10

00:00:37,300 --> 00:00:40,333

Obviously we can see that it has four directions

11

00:00:40,600 --> 00:00:42,866

connected to the external ground wire

12

00:00:42,966 --> 00:00:43,966

This is grounded

13

00:00:44,300 --> 00:00:48,800

If there is exposed copper next to it, there is no need to fix it up

14

00:00:49,400 --> 00:00:51,866

Also, we see this kind of wired wiring

15

00:00:51,900 --> 00:00:53,300

These are useful pins

16

00:00:53,400 --> 00:00:58,033

Once there is copper exposed on the edge, it needs to be filled with green oil

17

00:00:58,533 --> 00:01:01,300

If you don't know where you need to fix up or not

18

00:01:01,666 --> 00:01:04,666

Just fix it up once you find any exposed copper

19

00:01:04,966 --> 00:01:06,533

This is the simplest way

20

00:01:07,266 --> 00:01:10,400

The other is to look at this area inside the component

21

00:01:12,733 --> 00:01:15,366

Is there any glue that has not been scraped off

22

00:01:16,466 --> 00:01:18,333

A little bit more like this area

23

00:01:18,833 --> 00:01:20,266

It's not cleaned enough

24

00:01:20,466 --> 00:01:21,933

We'll clean it up later

25

00:01:23,633 --> 00:01:26,300

Like this area which glue is not scraped clean

26

00:01:29,633 --> 00:01:31,133

We need to deal with it again

27

00:01:33,500 --> 00:01:35,866

A lot of this glue will affect our welding

28

00:01:42,800 --> 00:01:45,733

Also, this solder slag must be cleaned

29

00:01:46,566 --> 00:01:48,733

When we are flattening low melt solder

30

00:01:49,100 --> 00:01:53,900

It is possible that the capacitors or pins on the edge will get some low melt solder

31

00:01:56,166 --> 00:01:58,066

After getting some low melt solder

32

00:01:58,500 --> 00:02:00,600

It will protrude a little inwardly

33

00:02:00,766 --> 00:02:05,700

Then when we solder the chip, it may stick to the cross-section of the lateral edge of the chip

34

00:02:05,933 --> 00:02:07,266

Just like this position

35

00:02:07,700 --> 00:02:12,666

The pin of the capacitor must be grounded at one end and power supply at the other end

36

00:02:13,033 --> 00:02:18,466

The big ones next to the hard drive are grounded at one end and powered at the other end

37

00:02:18,933 --> 00:02:20,800

This silver part is grounded

38

00:02:20,966 --> 00:02:26,866

When we measure, sometimes the testing lead will be placed on the surface of the hard disk to measure

39

00:02:27,200 --> 00:02:29,600

The silver on this surface is all ground

40

00:02:29,733 --> 00:02:33,500

Once the solder on the edge of the capacitor touches the side of the chip

41

00:02:35,266 --> 00:02:37,966

The hard drive may short-circuit when installed

42

00:02:38,500 --> 00:02:44,300

For example, there is a lot of solder sticking in this position, and it touches the side of the hard disk

43

00:02:44,733 --> 00:02:47,100

It'll be find once the hard drive is removed

44

00:02:47,633 --> 00:02:50,566

It is found that there is no exposed copper position

45

00:02:50,833 --> 00:02:56,466

But as soon as you put it on, it's short-circuited, and when you take it off, it's fine

46

00:02:56,666 --> 00:02:58,933

The hard disk can be read in the test rack

47

00:02:59,200 --> 00:03:01,900

At this time, many people can't find the problem

48

00:03:02,100 --> 00:03:09,066

In fact, it is because the edge of the peripheral capacitor is stuck to too much solder, and the contact occurs

49

00:03:09,566 --> 00:03:13,966

There is still some glue residue on the edges that has not been completely cleaned

50

00:03:14,433 --> 00:03:16,300

We'll get a brush to clean it off

51

00:03:18,000 --> 00:03:20,433

And now the motherboard has been cleaned well

52

00:03:20,666 --> 00:03:22,333

Let's put a bit soldering oil

53

00:03:24,600 --> 00:03:26,600

Blow it a bit with a hot air gun

54

00:03:26,966 --> 00:03:31,200

The soldering oil applied on the board will be more uniform when the board is warm

55

00:03:31,466 --> 00:03:33,533

And the thickness will be appropriate

56

00:03:35,266 --> 00:03:38,500

When the board is not warm, it will be very thick

57

00:03:42,500 --> 00:03:44,800

All pads have been smeared with flux

58

00:03:45,433 --> 00:03:47,233

Then we start to weld the chip on it

59

00:03:47,833 --> 00:03:51,600

The position where I entered the blade just now is exactly the pin 1

60

00:03:53,100 --> 00:03:56,600

There is still a little scratch at this position where I entered the knife

61

00:03:57,566 --> 00:03:59,600

This is the place where I entered the knife

62

00:03:59,966 --> 00:04:02,800

We put this corner in the direction where I entered the knife

63

00:04:03,133 --> 00:04:04,733

In the top right direction

64

00:04:05,233 --> 00:04:06,900

This is where I entered the knife

65

00:04:07,700 --> 00:04:10,466

Just about this place and there is no exposed copper

66

00:04:10,966 --> 00:04:13,800

Some people are lazy and do not replenish green oil

67

00:04:14,033 --> 00:04:16,933

If you don't,then you have to put it very right

68

00:04:17,533 --> 00:04:20,533

After the chip is placed, we will start soldering

69

00:04:21,033 --> 00:04:24,933

Adjust the temperature to around 280-300 degrees

70

00:04:25,266 --> 00:04:27,733

Then turn the air volume to level 3-4

71

00:04:28,133 --> 00:04:32,233

When blowing, firstly blow the area where I enter the knife

72

00:04:32,500 --> 00:04:34,466

Blown to this place and collapsed

73

00:04:34,600 --> 00:04:36,533

And then blow to other places

74

00:04:40,833 --> 00:04:45,600

Whether it is disassembled or installed, it must be kept away from the CPU

75

00:04:57,233 --> 00:04:59,133

I've seen a bit of a collapse here

76

00:04:59,533 --> 00:05:01,200

Then we blow other positions

77

00:05:06,033 --> 00:05:08,566

I saw that the chip has a slight homing action

78

00:05:11,000 --> 00:05:13,033

If you can hold tweezers steady

79

00:05:13,466 --> 00:05:18,133

At this time, you can choose to use tweezers to gently push the chip on the corner

80

00:05:18,233 --> 00:05:20,500

Push it a little and it bounces back

81

00:05:20,866 --> 00:05:22,533

That means it's fully placed

82

00:05:22,933 --> 00:05:23,966

Do not press

83

00:05:24,266 --> 00:05:27,466

Push it from the side like this, don't press

84

00:05:28,133 --> 00:05:33,900

Because the pads of the hard disk are relatively loose, the middle spacing is relatively large

85

00:05:34,533 --> 00:05:35,833

You can try like this

86

00:05:36,300 --> 00:05:39,233

Small chips are not recommended to try like this way

87

00:05:39,333 --> 00:05:42,233

It is easy to short-circuit if you are not skilled

88

00:05:42,466 --> 00:05:44,266

Okay, we're done welding