1

00:00:00,466 --> 00:00:02,533

iPhone display circuit repairing

2

00:00:03,433 --> 00:00:06,933

This video mainly explains how to find the display power supply signal

3

00:00:06,933 --> 00:00:09,866

and measurement points of the iPhone 12 and 12 Pro

4

00:00:11,633 --> 00:00:17,833

Search method Step 1, find the display power supply in the iPhone 12 Promax component map

5

00:00:18,533 --> 00:00:23,466

Step 2, find the display power supply in the bitmap and confirm the position number

6

00:00:24,133 --> 00:00:28,966

Step 3, search for the position number of the display power supply in the circuit diagram,

7

00:00:29,366 --> 00:00:31,366

and find the corresponding signal

8

00:00:34,100 --> 00:00:40,000

Step 4, jump to the bitmap according to the position number,

9

00:00:41,033 --> 00:00:44,700

The yellow points in the bitmap can measure the voltage and diode value

10

00:00:47,600 --> 00:00:54,666

When checking the diagrams, first open the component map, circuit diagram, and bitmap of iPhone 12 and 12 Pro

11

00:00:55,933 --> 00:00:58,900

Find the display power supply in the component map,

12

00:01:00,033 --> 00:01:03,433

confirm the display power supply position number in the bitmap,

13

00:01:04,533 --> 00:01:07,633

search for the position number in the schematic diagram

14

00:01:09,000 --> 00:01:14,366

After finding the display power supply, find the corresponding signals according to the circuit diagram

15

00:01:15,833 --> 00:01:23,200

Let's find the 4.6V, 7.3V and -7V power supplies of the display power supply output

16

00:01:24,900 --> 00:01:29,700

A3, B3, and C3 of the display power supply internally mark VOUT1

17

00:01:29,700 --> 00:01:33,533

is the 4.6V power supply output by the display power supply

18

00:01:34,066 --> 00:01:36,400

Jump to the bitmap according to the name,

19

00:01:36,766 --> 00:01:39,800

the power supply is directly connected to the display

20

00:01:40,633 --> 00:01:47,566

E5 F5 G5 and E3 F3 G3 of the display power supply are connected together,

21

00:01:47,800 --> 00:01:50,833

which is the negative 7V power supply of the display

22

00:01:51,333 --> 00:01:56,400

Jump to the bitmap according to the name, the power supply is also directly connected to the display

23

00:01:58,033 --> 00:02:01,933

The A5 pin of the display power supplies the 7.3V power supply

24

00:02:04,100 --> 00:02:06,500

Jump to the bitmap according to the name,

25

00:02:07,166 --> 00:02:12,600

the 7.3V power supply is directly connected to the display screen by the display power supply

26

00:02:13,733 --> 00:02:16,200

Let's find the other detection signals below

27

00:02:16,700 --> 00:02:18,833

First look for AMUX

28

00:02:19,533 --> 00:02:23,266

The C6 pin of the display power supply is the AMUX signal

29

00:02:24,366 --> 00:02:26,433

Jump to the bitmap according to the name,

30

00:02:27,133 --> 00:02:31,133

the signal is sent directly from the display power supply to the main power supply

31

00:02:32,466 --> 00:02:38,333

Let's find the screen identification signal sent by the main power supply to the display power supply, PANICB

32

00:02:40,966 --> 00:02:45,533

The E4 pin of the display power supply is the PANICB signal

33

00:02:48,400 --> 00:02:50,633

Jump to the bitmap according to the name,

34

00:02:51,200 --> 00:02:55,166

the signal is directly connected to the display power supply from the main power supply

35

00:02:55,700 --> 00:03:01,900

Let's find the screen identification signal from the display power supply to the display screen, PANICB

36

00:03:03,800 --> 00:03:08,766

The D3 pin of the display power supply identifies PANIC_OUT,

37

00:03:12,300 --> 00:03:17,700

indicating that this signal is the screen identification signal from the display power supply to the display screen

38

00:03:18,100 --> 00:03:21,466

In the bitmap, the signal is directly connected

39

00:03:27,633 --> 00:03:32,766

The C4 pin of the display power supply is the 4.6V power supply feedback pin,

40

00:03:33,133 --> 00:03:40,133

and the signal is connected to the 4.6V power supply after passing through the fuse resistor R9131

41

00:03:40,700 --> 00:03:45,966

If the resistor is damaged, the 4.6V power supply output will be abnormal

42

00:03:47,400 --> 00:03:50,366

The D2 and D1 pins are the test signals,

43

00:03:50,533 --> 00:03:54,900

which are only connected to the test points and not connected to other components

44

00:03:55,200 --> 00:03:57,833

We do not need to measure them during maintenance

45

00:04:02,300 --> 00:04:06,900

In this way, we have searched for all the signal pins of the display power supply

46

00:04:08,966 --> 00:04:11,133

Ok, that's all for this video