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iPhone touch circuit repairing

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This video mainly explains how to find touch circuit signals and measurement points of iPhone 12 and 12Pro

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Search method step 1, find the position number of the touch connector in the component map

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Step 2, search for the position number in the schematic diagram

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Step 3, find the corresponding signals in the circuit diagram

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Step 4, jump to the bitmap according to the pins, and view the connected components

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We can measure the voltage and diode value at the yellow points in the bitmap

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When searching for the signals, open the iPhone 12 and 12 Pro component map,

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schematic diagram and bitmap

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Find the touch connector in the component map

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Search for the position number of the touch connector in the schematic diagram

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After finding the touch connector, find the corresponding signals

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Let's find the 5.1V turn-on signal

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The 13th pin of the touch connector is a 5.1V turn-on signal

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Jump to the bitmap according to the name,

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the turn-on signal is directly connected to U8910 and U8900,

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and there is no fuse in the middle

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Let's find the 5.1V power supply of the touch screen

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The third pin of the touch connector is 5.1V power supply

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Jump to the bitmap according to the name,

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the 5.1V power supply is directly connected to the conversion chip U8910

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Let's find the interrupt signal from the touch screen to the CPU

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The 12th pin of the touch connector is an interrupt signal

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Jump to the bitmap according to the name,

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the interrupt signal is connected to the second pin of U11620

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U11620 is the conversion chip

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the 2nd pin is input, and the 7th pin is output

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After it outputs, it is connected to the CPU after passing through the fuse resistor R11620

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Let's look for other detection signals

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MANY_SCAN

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The 5th pin is MANY_SCAN pin

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Jump to the bitmap according to the name,

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the signal is connected to the main power supply, and the camera power supply

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Let's find the data clear signal sent by the touch screen to the CPU

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The 8th pin of the touch connector is the data clear signal

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Jump to the bitmap according to the name,

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the data clear signal is connected to the third pin of the conversion chip U11620

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After the signal passes through U11620, it is output from the 6th pin,

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and after the 6th pin to output, it passes the fuse resistor R11621 and then connects to the CPU

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Let's find the UART bus from the CPU to the touch screen

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The second pin of the touch connector is the UART bus emission

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Jump to the bitmap according to the name,

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the emission signal is connected to the third pin of the conversion chip U11640

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after passing through the fuse resistor R11631

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U11640's 3 pin goes in and then goes out from the 4th pin

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Jump to the bitmap according to the name,

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after the 4th pin, it is connected to the CPU

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The 7th pin of the touch connector is the receiving signal for the UART bus

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Jump to the bitmap according to the name,

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the receiving signal is directly connected to the third pin of U11630

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Input from the 3rd pin, and output from the 4th pin

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After the 4th pin, it is connected to the fuse resistor R11630,

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and then connected to the CPU after passing through the resistor

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Let's find the display touch synchronization signal from the display screen to the touch screen

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The 4th pin of the touch connector is the display touch synchronization signal

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Jump to the bitmap according to the name,

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the signal is directly connected from the touch connector to the display connector,

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and no other components are connected

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In this way, we have searched all the signals of the touch circuit

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Ok, that's all for this video