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iPhone camera circuit repairing

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This video mainly explains the working principle of iPhone 11 Pro, 11 Pro Max telephoto camera

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Working principle step 1, after power on,

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the main power supply will output many power supplies,

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among which the 1.8V power supply will first provide the working voltage for the telephoto camera

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Step 2, after the working condition of the camera power supply is normal,

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the telephoto camera will be detected through the I2C bus

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Step 3, the camera power supply 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 first outputs 1.15V, 3.3V and PPVR AVDD2 power supply of the telephoto camera,

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and then controls the camera conversion tube to generate 2.925V and PPVR PVDD power supply

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Step 5, after the power supply of the camera is normal,

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the camera power supply sends an open signal to the telephoto camera

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All the working conditions of the telephoto camera have been met

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However, in the process of entering the system,

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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,

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

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

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Among these working principles, if one of the signals is abnormal,

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the camera cannot be turned on

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That's all for this video