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iPhone camera circuit repairing

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This video mainly explains how the iPhone 12 Pro Max telephoto camera works

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Working principle step 1, after triggering the switch,

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and the working condition of the camera power supply 2 is normal,

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it will first send 1.8V power supply to the telephoto camera

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Step 2, after the camera power supply 2 sends the 1.8V power supply,

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it will detect the telephoto camera through the I2C bus

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Step 3, after the camera power supply 2 detects the camera,

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it sends a 24M clock signal for the telephoto camera

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Step 4, when starting to the camera circuit,

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the camera power supply 2 first sends 1.35V and 0.975V power supply for the telephoto camera

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At the same time, it will also control the camera power supply conversion tube,

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so that the conversion tube provides 0.8V, 2.85V and PPVR PVDD power supply for the telephoto camera

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Step 5, after the power supply is output,

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the camera power supply will send an open signal for the telephoto camera

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At this time, the working conditions of the telephoto camera have been met

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The working condition of the step 4 and step 5 will only last about 1 second during the startup process,

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and then the signal will be turned off

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After entering the system, when using the camera,

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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 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, steps 1-6 are the working conditions of the wide-angle camera

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If one is abnormal, it will cause the camera to fail to open

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In the block diagram, RCAM_TO_MANY_SYNC in the block diagram is the synchronization signal

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from the telephoto camera to other cameras

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If there is a problem with the signal, it will cause a black screen when switching cameras

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In actual maintenance, the signal is rarely damaged

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That's all for this video