1
00:00:00,733 --> 00:00:02,600
iPhone camera circuit repairing
2
00:00:03,600 --> 00:00:09,266
This video mainly explains the working principle of the camera circuit of iPhone 8 to iPhone XS Max
3
00:00:11,566 --> 00:00:15,333
The working principle of the camera circuit of these models is the same,
4
00:00:15,533 --> 00:00:17,866
and the maintenance method is the same
5
00:00:18,000 --> 00:00:22,233
In the camera circuit, no matter it is a front camera or a rear camera,
6
00:00:23,300 --> 00:00:25,600
a camera corresponds to a block diagram
7
00:00:27,366 --> 00:00:31,133
The main difference between the front camera and the rear camera is the power supply
8
00:00:32,033 --> 00:00:34,600
The pixels of the front camera are relatively low,
9
00:00:34,700 --> 00:00:36,900
and the voltage required is relatively small
10
00:00:37,066 --> 00:00:39,900
Generally, there are only two or three power supplies
11
00:00:40,100 --> 00:00:45,133
The rear camera has relatively high pixels and will work in different magnification modes,
12
00:00:45,300 --> 00:00:47,233
so it needs more power supply
13
00:00:47,800 --> 00:00:51,333
Camera working principle step 1, when triggering the switch,
14
00:00:51,833 --> 00:00:57,766
the main power supply will first output 1.8V power supply to provide the working voltage for the camera
15
00:00:58,200 --> 00:01:01,900
Step 2, after the CPU working condition is normal,
16
00:01:02,066 --> 00:01:04,566
it will detect the camera through the I2C bus
17
00:01:06,800 --> 00:01:10,066
Step 3, when starting to the camera circuit,
18
00:01:10,266 --> 00:01:13,966
the adjustable power supply current will be above 700mA,
19
00:01:14,500 --> 00:01:17,700
and the camera power supply provides power for the camera
20
00:01:18,766 --> 00:01:21,633
Step 4, when starting to the camera circuit,
21
00:01:21,833 --> 00:01:24,300
the CPU sends a clock signal to the camera
22
00:01:25,500 --> 00:01:29,300
Step 5, the CPU sends an open signal to the camera
23
00:01:32,333 --> 00:01:37,066
After the camera has power supply, clock and open signals, it can work normally
24
00:01:38,066 --> 00:01:43,433
After entering the system, the CPU will turn off the power supply, clock, and open signals
25
00:01:43,733 --> 00:01:46,733
The advantage of this is that it can save power
26
00:01:47,233 --> 00:01:49,900
Step 6, when we open the camera APP,
27
00:01:51,000 --> 00:01:54,900
the CPU will allow the camera power supply to provide power to the camera,
28
00:01:55,800 --> 00:01:58,833
and the CPU will send a clock signal and a start signal
29
00:01:59,300 --> 00:02:03,766
After the camera has working conditions, it starts to collect image information
30
00:02:04,266 --> 00:02:09,466
The camera will send the collected image information to the CPU through the LPDP bus
31
00:02:10,533 --> 00:02:15,200
After the CPU receives the data, it will display the information on the screen
32
00:02:16,566 --> 00:02:21,566
When we click the camera button, the CPU will intercept the current LPDP bus data
33
00:02:21,966 --> 00:02:25,533
and transfer it to the hard disk to complete the camera function
34
00:02:26,533 --> 00:02:28,500
When we click the recording function,
35
00:02:28,866 --> 00:02:33,266
the CPU will continuously transfer the LPDP bus data to the hard disk
36
00:02:34,366 --> 00:02:38,966
When we press stop, the CPU no longer collects LPDP bus data,
37
00:02:39,433 --> 00:02:41,400
and the video recording is completed
38
00:02:41,966 --> 00:02:47,600
In the functional block diagram, AUX is the data monitoring signal from the CPU to the camera,
39
00:02:48,166 --> 00:02:51,233
mainly used to detect LPDP bus data
40
00:02:51,933 --> 00:02:54,200
When repairing the failure of the camera,
41
00:02:54,833 --> 00:02:57,566
we need to check all the working conditions of the camera
42
00:02:58,033 --> 00:03:02,433
If one of the working conditions is abnormal, the camera cannot be turned on
43
00:03:02,900 --> 00:03:04,566
That's all for this video
