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iPhone connection circuit repairing
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This video mainly explains the working principle of the connection circuit
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of iPhone XR to iPhone 11 Pro Max models
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In the functional block diagram, the main power supply, CPU, USB chip, ACC power supply chip,
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and the charging connector form the connection circuit
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Working principle step 1, after the iPhone is triggered,
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the main power supply will provide 1.8V and 3.0V power supply for the USB chip
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after receiving the power-on signal
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Step 2, after the CPU works normally, it will detect the USB chip through the I2C bus,
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and the iPhone will enter the system after the detection is passed.
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Step 3, when copying the iPhone data, we plug in the data cable,
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and the data cable insertion detection signal DETECT will be sent to the USB chip through the charging connector
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Step 4, after the USB chip receives the DETECT signal,
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it will send the data line ID identification signal to the main power supply
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Step 5, after the main power supply receives the ID signal,
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it will send an identification signal to the CPU
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The CPU controls the ACC power supply chip through the I2C bus
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to generate ACC power supply and send it to the USB chip
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Step 6, after the USB chip receives the ACC power supply,
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it will convert ACC1 and ACC2 power supplies,
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and send them to the data line through the charging connector
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ACC1 and ACC2 are the power supply voltages on the front and back of the data line
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Step 7, after the data line has power supply,
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it will send the verification information of the computer connection to the USB chip
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through the DP1 and DP2 buses
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Step 8, after the USB chip receives the connection information, it sends an interrupt signal to the CPU
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Step 9, after the CPU receives the interrupt signal,
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it will read the connection information through the UART bus
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After the verification information is read, the "Add Trust" prompt will pop up on the screen
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After clicking Trust, it will pop up a prompt to enter the screen unlock password
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When we enter the password, the iPhone and computer can establish a connection
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Step 10, when copying data on the computer,
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the CPU will read the data stored in the hard disk and send it to the USB chip through the USB bus
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Step 11, after the USB chip receives the data,
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it sends it to the data line through the DP1 and DP2 buses,
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and then sends it to the computer
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At this time, the progress of copying data will be displayed on the computer
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If there is no response when we plug in the data cable,
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it means that the connection circuit is faulty
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First, we can replace the USB chip
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If it is still not normal after replacement, we check the working conditions of the USB chip
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That's all for this video
