1

00:00:03,000 --> 00:00:05,133

After the honeycomb holes are reballed

2

00:00:05,566 --> 00:00:09,500

Next, we will reball on the back of the chip, which has the most pads

3

00:00:13,500 --> 00:00:16,133

This location has more than 1000 points

4

00:00:17,400 --> 00:00:18,966

Very difficult to do it

5

00:00:20,500 --> 00:00:22,433

We have a dedicated reballing tool

6

00:00:22,766 --> 00:00:24,933

I'll do it by hand for you to see first

7

00:00:25,433 --> 00:00:30,233

Later when reball the cover, I'll use the reballing tool to do it for you to see

8

00:00:38,700 --> 00:00:40,233

Align the stencil first

9

00:00:42,133 --> 00:00:43,700

Press it with tweezers

10

00:00:51,366 --> 00:00:55,000

Apply the solder paste from the beginning to the end for one time

11

00:00:55,233 --> 00:00:57,366

Don't do it over and over again

12

00:01:02,333 --> 00:01:06,500

After the solder paste is applied, raise the back of the knife handle

13

00:01:07,000 --> 00:01:08,766

Shovel forward slowly

14

00:01:08,966 --> 00:01:12,966

When applying, try to apply from the left to the right at a time

15

00:01:13,933 --> 00:01:17,733

But when shovelling, you can shovel like this repeatedly

16

00:01:18,566 --> 00:01:25,366

Shovel a few more times to ensure that the excess solder paste that is not close to the position is shoveled out

17

00:01:28,333 --> 00:01:32,833

After shoveling, you can now find a dust-free cloth to wipe it

18

00:01:33,200 --> 00:01:36,533

There should be no PCB cleaner on this dust-free cloth

19

00:01:37,066 --> 00:01:39,266

Not a wet wipe but a dry one

20

00:01:44,766 --> 00:01:47,666

Hot air gun, 230 degrees

21

00:01:49,966 --> 00:01:53,733

Heat a large area first to prevent deformation of the stencil

22

00:01:56,666 --> 00:02:02,366

When a small chip is reballed, the deformation of the stencil is not so obvious

23

00:02:02,633 --> 00:02:08,533

But once the stencil of a chip like CPU is deformed, it means that the reballing has failed

24

00:02:13,333 --> 00:02:15,766

Quickly sweep a large area like this

25

00:02:17,533 --> 00:02:19,166

Let the whole stencil heat up

26

00:02:27,566 --> 00:02:29,100

For about one minute

27

00:02:29,800 --> 00:02:32,033

Slowly blow the solder from a corner

28

00:02:42,666 --> 00:02:44,266

Now the reballing is done

29

00:02:44,766 --> 00:02:47,133

But don't be in a hurry to loosen the tweezers

30

00:02:47,700 --> 00:02:51,000

Be sure to wait for the solder to solidify before loosening

31

00:02:51,633 --> 00:02:53,400

Wait more than 10 seconds

32

00:02:59,266 --> 00:03:00,766

Then lift up this stencil

33

00:03:03,933 --> 00:03:07,066

You can take a look at the hole after the stencil is lifted

34

00:03:07,300 --> 00:03:11,233

Check if there are any remaining solder beads in the holes of the stencil

35

00:03:11,666 --> 00:03:17,800

If there are residual solder beads in the holes of the stencil, it means that the corresponding pads are not reballed

36

00:03:18,433 --> 00:03:19,166

It's clean

37

00:03:20,366 --> 00:03:21,466

Nothing on it

38

00:03:22,433 --> 00:03:24,733

This means that the pads are all reballed