1

00:00:00,433 --> 00:00:02,466

High current occurs when iPhone starts up

2

00:00:02,766 --> 00:00:06,166

In this lesson, we will learn about the maintenance process

3

00:00:06,700 --> 00:00:10,300

Maintenance process Step 1, appearance inspection

4

00:00:10,733 --> 00:00:12,133

Before the maintenance,

5

00:00:12,733 --> 00:00:18,066

we should first check the mainboard under the microscope to see whether there is obvious water corrosion,

6

00:00:18,633 --> 00:00:20,800

or obvious burned components

7

00:00:21,233 --> 00:00:24,233

If there is, we can deal with it first

8

00:00:25,833 --> 00:00:27,166

When we look at the mainboard,

9

00:00:27,366 --> 00:00:29,966

we need to look at the front and the back of the mainboard

10

00:00:33,766 --> 00:00:37,733

If we can get the sticker off the mainboard, we'll get the sticker off

11

00:00:38,900 --> 00:00:42,233

If it has a shield, do not remove the shield yet

12

00:00:43,833 --> 00:00:47,566

If it is a double layer mainboard, we do not layer,

13

00:00:47,833 --> 00:00:51,033

first observe if the mainboard has a layer fit gap

14

00:00:52,700 --> 00:00:55,533

For example, this mainboard is corroded by water

15

00:00:56,266 --> 00:00:59,033

Some capacitors have been corroded and oxidized

16

00:00:59,300 --> 00:01:03,633

Like this we must deal with it, we need to replace the capacitor or chip

17

00:01:08,800 --> 00:01:11,266

When we looked at the mainboard under the microscope,

18

00:01:11,933 --> 00:01:15,600

we found that it had dropped parts and misaligned components

19

00:01:16,666 --> 00:01:18,466

If we find such problems,

20

00:01:18,700 --> 00:01:22,633

we need to deal with them promptly and as a matter of priority

21

00:01:23,200 --> 00:01:27,033

This mainboard, for example, when we looked at it under the microscope,

22

00:01:27,200 --> 00:01:29,700

we found that the chip had broken corners

23

00:01:30,033 --> 00:01:32,700

Chip broken corners may cause short circuit,

24

00:01:32,866 --> 00:01:35,033

boot high current and other failures

25

00:01:35,933 --> 00:01:38,766

In cases like this we need to replace the chip

26

00:01:40,066 --> 00:01:43,033

If no problem is found in the appearance inspection,

27

00:01:43,533 --> 00:01:47,366

we will operate step by step according to the maintenance process below

28

00:01:47,566 --> 00:01:49,500

So that's all for this lesson