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iPhone camera circuit repairing
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This video mainly explains the working principle of iPhone 12 and 12Pro super-wide-angle cameras
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Working principle step 1, after power on,
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and the camera power supply is in normal working condition,
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it will first output 1.8V power supply to provide the working voltage for the super-wide-angle camera
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Step 2, the camera power supply will detect the super-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
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Step 4, when starting to the camera circuit,
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the camera power supply will output PPVAR and PP1V2 power supply to provide working voltage for the camera,
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and also control the camera conversion tube to provide 2.85V power supply for the camera
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Step 5, after the camera power supply is output,
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it will send an open signal to the super-wide-angle camera
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the duration of the working conditions in steps 4 and 5 is relatively short,
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about 1 second
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When we use the camera function, then step 4 and step 5 working conditions will be issued
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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, 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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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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SYNC is the synchronization signal from the super-wide-angle camera to other cameras
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RCAM_TO_STROBE is the open signal from the super-wide-angle camera to the flash
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In the block diagram, steps 1- 6 are the working conditions of the camera
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If there is an abnormal signal, it will cause the camera to fail to open
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If there is a problem with the synchronization signal,
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it will cause a black screen when switching cameras
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If the open signal to the flash is abnormal, it will cause the flash to fail to open
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If there is a short circuit, the camera will not work properly
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That's all for this video
