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iPhone camera circuit repairing

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This video mainly explains the working principle of the iPhone 12 series front camera

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Working principle step 1, after triggering the switch,

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the camera power supply will output 1.8V power supply,

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firstly provide the working voltage for the front camera

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Step 2, after the camera power supply is output,

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it will detect the front 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 12M clock signal to the front camera

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Step 4, when starting to the camera circuit,

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the camera power supply sends 2.85V and 1.1V power supply to the front camera

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Step 5, the camera power supply sends an open signal to the front camera

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After entering the system, when the camera function is not used,

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the working conditions of step 4 and step 5 will be closed

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The advantage of this design is that it can save power

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Step 6, when using the camera function,

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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,

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it will display the information on the screen

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When we click the camera button,

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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,

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If there is a working condition is abnormal,

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it will cause the front camera to not be turned on

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The front camera has another signal,

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which is the synchronization signal from the front camera to the infrared camera

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The function of this signal is that when we record the face,

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the front camera will collect the image, to help observe the position of the face

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That's all for this video