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iPhone camera circuit repairing

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This video mainly explains the working principle of iPhone 11, 11 Pro, and 11 ProMax wide-angle camera circuit

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The working principle of these three models is basically the same,

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but there is a slight difference in the power supply

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Camera working principle step 1, after starting up,

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the main power supply will first output 1.8V power supply to provide the working voltage for the wide-angle camera

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Step 2, in the process of starting the system,

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the camera power supply will detect the wide-angle camera through the I2C bus

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Step 3, after the camera power supply detects the camera,

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it will send a 24M clock signal for the camera

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Step 4, in the process of starting the system,

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the main power supply will send out 3.3V power supply to provide the working voltage for the camera

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Step 5, when starting up the camera circuit,

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the camera power supply will output power supply to provide the camera with working voltage,

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and also control the camera power conversion tube to provide other working voltages for the camera

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Step 6, after the camera power supply output,

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it will send an open signal to the camera

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At this time, the working conditions of the camera are basically satisfied and it can work normally

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After entering the system, the CPU will control the camera power supply and the main power supply,

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and turn off all the working conditions except for the 1.8V power supply

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The advantage of this design is that it can save power

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When using the camera function, click the camera icon on the iPhone,

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the CPU will control the camera power supply,

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and let the camera power supply send the working conditions of the camera

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After the camera has working conditions, it starts to collect image information

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The camera will send the collected image information to the CPU through the LPDP bus

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After the CPU receives the data, it will display the information on the screen

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When we click the camera button, the CPU will intercept the current LPDP bus data

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and transfer it to the hard disk to complete the camera function

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When we click the recording function,

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the CPU will continuously transfer the LPDP bus data to the hard disk

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When we press stop, the CPU no longer collects LPDP bus data,

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and the video recording is completed

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In the functional block diagram, SYNC is the synchronization signal

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from the wide-angle camera to the ultra-wide-angle camera

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Because when taking pictures, we can switch the magnification,

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using different magnifications will use different cameras

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With the synchronization signal, when we zoom in, we can switch the camera seamlessly

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In the functional block diagram, AUX is the data monitoring signal from the CPU to the camera,

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mainly used to detect LPDP bus data

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When repairing the failure of the camera,

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we need to check all the working conditions of the camera

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If one of the working conditions is abnormal, the camera cannot be turned on

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That's all for this video