1

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

iPhone starts with high current

2

00:00:02,566 --> 00:00:05,133

In this video, we mainly explain the maintenance process of the overcurrent after starting up

4

00:00:09,100 --> 00:00:10,533

If the power-on current is too high, it means that after the motherboard is powered on, we trigger the switch

6

00:00:14,100 --> 00:00:17,800

The current starts to jump from more than 100 or 200mA

7

00:00:17,933 --> 00:00:20,000

But some he does not affect the boot

8

00:00:20,266 --> 00:00:22,533

Sometimes we call this fault as fast power consumption fault

10

00:00:24,833 --> 00:00:27,800

Then let's take a look at the repair process

11

00:00:28,166 --> 00:00:30,300

Maintenance process 1, visual inspection

12

00:00:30,433 --> 00:00:32,300

The inspection method is the same

13

00:00:32,533 --> 00:00:33,800

Maintenance process 2

14

00:00:34,133 --> 00:00:37,766

If the machine is triggered and the current is more than 200 mA, it will jump

15

00:00:37,800 --> 00:00:39,533

If the machine can be turned on, we can determine which circuit caused it by testing the functions of the mobile phone.

19

00:00:45,700 --> 00:00:49,900

The common functions that lead to high power-on current include fingerprints, light-sensing, distance-sensing, compass, USB and other peripheral circuits

twenty three

00:00:58,366 --> 00:01:00,300

Next, let's test the sensitivity

twenty four

00:01:00,666 --> 00:01:03,433

Photosensitive means that the screen brightness will automatically brighten and dim under strong light

26

00:01:07,433 --> 00:01:10,433

Sensitive distance is that when we make a call, when an object is close to the receiver, the screen will automatically turn off the screen

28

00:01:14,066 --> 00:01:17,200

If the screen does not go off, it means there is a problem with the sensing distance

29

00:01:18,633 --> 00:01:20,200

Let's turn on the compass and see if he turns

31

00:01:22,866 --> 00:01:24,033

If it cannot rotate, it means that there is something wrong with the compass circuit

33

00:01:26,233 --> 00:01:28,833

If we detect which function is abnormal, we can repair the corresponding functional circuit

35

00:01:32,233 --> 00:01:34,133

Repair Process Step 3

36

00:01:34,566 --> 00:01:38,266

Then if we test the functions of the mobile phone, everything is normal,

37

00:01:38,566 --> 00:01:41,066

You can disconnect the cable and test it on the bare board

39

00:01:43,266 --> 00:01:47,700

After the motherboard is powered on, we use tweezers to trigger the switch pins

40

00:01:48,366 --> 00:01:49,733

After triggering the switch pin, we can see that the current starts to jump from 60mA

43

00:01:53,800 --> 00:01:56,200

Then this is a normal motherboard.

44

00:01:56,666 --> 00:01:59,000

Because some external devices are damaged, the starting current will be too large

46

00:02:02,066 --> 00:02:05,866

Then if we cut off the cable and power on the test, the power-on current is normal.

48

00:02:07,900 --> 00:02:10,333

We can buckle up the cables in turn to determine which external configuration caused the failure.

50

00:02:14,500 --> 00:02:16,900

In this video, we will first explain here