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iPhone connection circuit repairing

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This video mainly explains the working principle of the connection circuit of iPhone 6 to iPhone 6sp 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 data line ID identification signal,

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it will send accessory power supply PP3V3_ACC 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, 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