1

00:00:03,000 --> 00:00:05,266

After scraping, we clean the chip

2

00:00:09,133 --> 00:00:10,800

Brush with PCB cleaner

3

00:00:11,866 --> 00:00:13,266

Check out this place

4

00:00:14,400 --> 00:00:17,400

The hole in the middle layer is similar to the honeycomb

5

00:00:18,733 --> 00:00:19,866

Very regular

6

00:00:22,666 --> 00:00:26,100

Clean out the yellow dirty glue residue in the honeycomb holes

7

00:00:29,533 --> 00:00:30,600

Brush gently

8

00:00:31,000 --> 00:00:32,600

Don't use too much force

9

00:00:56,566 --> 00:00:59,300

After most of the glue residue has been cleaned

10

00:01:00,100 --> 00:01:02,500

Next, we need to flatten the solder again

11

00:01:04,033 --> 00:01:10,200

Because this position has just been flattened and scraped, there is still a lot of solder in some pads

12

00:01:11,000 --> 00:01:15,266

For example, the area in the upper left corner that we see now

13

00:01:15,933 --> 00:01:18,133

It's still flat at these points

14

00:01:22,600 --> 00:01:24,266

These spots are full of solder

15

00:01:26,800 --> 00:01:29,600

It has more solder than the next step to reball

16

00:01:30,900 --> 00:01:33,033

So gotta flatten the solder a little bit

17

00:01:36,533 --> 00:01:41,633

Be sure to remember that the steps are to clean first and then flatten the solder

18

00:01:42,766 --> 00:01:44,433

Low melt solder of course

19

00:01:58,066 --> 00:01:59,666

Just flatten like this

20

00:02:00,200 --> 00:02:02,533

This point is obviously smaller

21

00:02:19,300 --> 00:02:26,700

After the solder was flattened, it was found that there was an idle pad in the area below the chip stuck into the hole

22

00:02:28,900 --> 00:02:30,633

We need to deal with this idle pad

23

00:02:31,500 --> 00:02:35,366

It is best to use a straight-air gun to heat this copper color place

24

00:02:39,333 --> 00:02:44,066

The heating area of the straight-air gun is small and the temperature rises quickly

25

00:02:44,400 --> 00:02:45,900

We choose a sharp blade

26

00:02:49,100 --> 00:02:51,666

Then pick from the side with the tip of the knife

27

00:02:51,833 --> 00:02:53,700

Blow the solder and take it out

28

00:02:57,200 --> 00:02:58,433

Check other position

29

00:02:58,466 --> 00:03:00,733

There was one at this location just now

30

00:03:01,033 --> 00:03:03,633

This should have been flattened out when flatten

31

00:03:08,933 --> 00:03:10,233

No more big pads

32

00:03:10,600 --> 00:03:11,833

No more idle pads

33

00:03:12,900 --> 00:03:15,066

Next, let's start cleaning the chip

34

00:03:15,633 --> 00:03:17,533

Ready to reball this mid layer