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iPhone camera circuit repairing

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This video mainly explains how the iPhone 11 front camera works

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The iPhone 11 front cameras work a little differently than the previous models

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Most of its signals are provided by the camera power supply

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Working principle step 1, after triggering the switch,

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the camera power supply will first provide 1.8V power supply for the front camera

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Step 2, after power on,

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the camera power will detect the front camera through the I2C bus

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Step 3, the camera power supply sends 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 provides 2.85V and 1.1V power supply for the front camera

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Step 5, when starting to the camera circuit,

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

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In the working conditions of step 4 and step 5,

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the signals can only be measured when the current is about 1A during the startup process

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After entering the system, the signals of step 4 and step 5 will be turned off,

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which is designed to save power

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Step 6, when using the camera function, 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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LPDP_AUX is the LPDP bus data detection signal from the CPU to the front camera

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If one of the working conditions is abnormal,

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the camera cannot be turned on

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That's all for this video