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iPhone camera circuit repairing

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This video mainly explains the working principle of iPhone 12 Pro telephoto camera

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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 telephoto camera

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Step 2, the camera power supply will detect the telephoto camera through the I2C bus

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Step 3, after the camera power 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 first outputs the 3V and AVDD2 power supply of the telephoto camera,

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and controls the camera conversion tube at the same time,

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so that the camera conversion tube outputs the PP2V85V,

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PPVAR_PVDD power supply and 1.2V power supply for the camera

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Step 5, the camera power supply sends an open signal for the telephoto 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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When we use the camera function,

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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 we open the camera APP,

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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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CAM_AUX is the LPDP bus detection signal from the CPU to the telephoto camera

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SYNC is the synchronization signal from the telephoto camera to other cameras

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RCAM_TO_STROBE is the open signal from the telephoto 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 one of the working conditions of the telephoto camera is abnormal,

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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,

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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