1

00:00:00,233 --> 00:00:02,233

iPhone touch circuit repairing

2

00:00:02,766 --> 00:00:07,900

This video explains how to find the iPhone XS touch circuit signals and measurement points

3

00:00:10,200 --> 00:00:15,633

Search method step 1, find the position number of the touch connector in the component map

4

00:00:19,300 --> 00:00:23,133

Step 2, search for the position number in the schematic diagram

5

00:00:23,833 --> 00:00:28,066

Step 3, find the corresponding signals in the circuit diagram

6

00:00:29,300 --> 00:00:32,566

Step 4, jump to the bitmap according to the pins,

7

00:00:32,833 --> 00:00:34,933

and view the connected components

8

00:00:35,533 --> 00:00:39,366

We can measure the voltage and diode value at the yellow points in the bitmap

9

00:00:41,533 --> 00:00:47,666

When looking up the maps, first open the iPhone XS component map, circuit diagram, and bitmap

10

00:00:48,766 --> 00:00:51,366

Find the touch connector in the component map

11

00:00:54,633 --> 00:00:58,566

Search for the position number of the touch connector in the schematic diagram

12

00:00:59,233 --> 00:01:03,333

After finding the touch connector, find the corresponding signals

13

00:01:05,333 --> 00:01:09,066

iPhone XS and X are only different in the detection signals,

14

00:01:09,400 --> 00:01:12,166

the main signals and working principles are the same

15

00:01:13,400 --> 00:01:16,333

Let's look for other detection signals for iPhone XS

16

00:01:17,066 --> 00:01:21,500

First look for the MANY_FORCE signal from the touch screen to the main power supply

17

00:01:21,666 --> 00:01:26,633

This signal is actually a forced synchronization signal, which will be connected to many chips

18

00:01:26,966 --> 00:01:30,633

The 27th pin of the touch connector is MANY_FORCE signal

19

00:01:31,000 --> 00:01:32,866

Jump to the bitmap according to the name,

20

00:01:33,800 --> 00:01:39,566

the signal will pass through the fuse inductor FL5841 and then connects to the main power supply,

21

00:01:39,633 --> 00:01:42,866

baseband power supply, camera power supply and other chips

22

00:01:43,900 --> 00:01:46,066

SCAN scanning signal

23

00:01:46,866 --> 00:01:50,633

The 7th pin of the touch connector is the scanning signal, SCAN

24

00:01:52,200 --> 00:01:54,166

Jump to the bitmap according to the name,

25

00:01:54,766 --> 00:02:00,866

the scanning signal is connected to the touch power supply after passing through the fuse inductor FL5805

26

00:02:01,600 --> 00:02:06,666

Let's find the SWD from the CPU to the touch screen, the serial debug bus

27

00:02:07,266 --> 00:02:10,166

Pin 9 of the touch connector is the serial bus clock

28

00:02:10,933 --> 00:02:13,100

Jump to the bitmap according to the name,

29

00:02:13,666 --> 00:02:19,500

the serial bus clock is connected to the CPU after passing through the fuse resistor R5844,

30

00:02:19,900 --> 00:02:22,766

Pin 11 of the touch connector is serial data

31

00:02:23,233 --> 00:02:25,033

Jump to the bitmap according to the name,

32

00:02:25,966 --> 00:02:31,833

the serial data is connected to the CPU after passing through the fuse inductor FL5845

33

00:02:32,200 --> 00:02:35,466

Let's find the UART bus from the CPU to the touch screen

34

00:02:35,733 --> 00:02:39,333

The 10th pin of the touch base is UART bus receiving

35

00:02:39,733 --> 00:02:41,966

Jump to the bitmap according to the name,

36

00:02:42,633 --> 00:02:48,733

and the receiving signal is connected to the CPU after passing through the fuse inductor FL5804

37

00:02:49,166 --> 00:02:52,933

The 12th pin of the touch connector is the UART bus emission

38

00:02:53,566 --> 00:02:55,633

Jump to the bitmap according to the name,

39

00:02:56,433 --> 00:03:02,500

and the emission signal is connected to the CPU after passing through the fuse inductor FL5803

40

00:03:03,833 --> 00:03:07,133

Let's find the reference clock from the CPU to the touch screen

41

00:03:08,200 --> 00:03:11,533

The 17th pin of the touch connector is the reference clock

42

00:03:11,900 --> 00:03:13,900

Jump to the bitmap according to the name,

43

00:03:14,500 --> 00:03:21,766

the reference clock is firstly connected to the fuse resistor R5801, then connects to the resistor R1481,

44

00:03:22,266 --> 00:03:24,200

and then connects to the CPU

45

00:03:26,800 --> 00:03:29,400

Let's find SCAN_CLK signal

46

00:03:29,866 --> 00:03:31,100

In the iPhone X model,

47

00:03:31,333 --> 00:03:36,300

this signal is actually a display touch synchronization signal from the CPU to the touch screen

48

00:03:36,933 --> 00:03:38,966

Jump to the bitmap according to the name,

49

00:03:39,466 --> 00:03:45,800

the synchronization signal is connected to the CPU after passing through the fuse inductor FL5847,

50

00:03:46,533 --> 00:03:51,133

In this way, we have searched all the signals of the iPhone XS touch circuit

51

00:03:51,566 --> 00:03:53,633

When troubleshooting a no touch fault,

52

00:03:54,000 --> 00:03:56,700

if any pin value is found to be abnormal,

53

00:03:57,233 --> 00:04:01,300

we will measure the components connected to the pin, or replace the components

54

00:04:02,200 --> 00:04:04,266

Ok, that's all for this video