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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 front camera circuit
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Camera working principle step 1, after starting up,
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the main power supply will first output 1.8V power supply to provide the working voltage for the front camera
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Step 2, after the CPU working condition is normal,
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it will read and detect the front camera through the I2C bus
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Step 3, after the CPU detects the camera,
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it will send a 12M clock signal for the front camera
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Step 4, when starting to the camera circuit,
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the camera power supply will control the conversion tube
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to provide 2.925V and 1.2V power supply for the front camera
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Step 5, when booting to the camera circuit,
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the CPU sends an open signal to the front camera
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At this time, all the working conditions of the front camera have been met and can work normally
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After entering the system, the CPU will turn off the clock signal, open signal, 2.95V and 1.2V power supply,
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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, 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, SYNC is the synchronization signal
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from the front camera to the infrared camera
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When we record the face, we can see the picture of the face
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This is because when the infrared camera is working,
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the front camera will also work at the same time,
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so that the imaging information will be displayed on the recording interface
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If there is a problem with their sync signal,
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or when the front camera is not installed,
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there will be no portrait when we record the screen,
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but it will not affect the recording of the face
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LPDP_AUX is the LPDP bus data detection signal from the CPU to the front camera
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When repairing the failure of the camera,
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we need to check all the working conditions of the camera
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If one of the working conditions is abnormal, the camera cannot be turned on
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That's all for this video
