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iPhone touch circuit repairing

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This video mainly explains how to find the touch circuit signals and measurement points

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of iPhone 11 Pro and Promax models

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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 checking the diagrams, we first open the component map, circuit diagram,

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and bitmap of the iPhone 11 Pro, Promax

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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 sent by the touch screen to the conversion chip

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The pin 17 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 connected to the conversion chip U5500 and U5501

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after passing through the fuse resistor R8197

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If U5500 and U5501 are damaged, the touch screen will not have 5.1V power supply

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

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The pin 19 of the touch connector provides 5.1V power supply for the touch screen

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Jump to the bitmap according to the name,

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the 5.1V power supply passes through the fuse resistor R8196

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and then connects to the conversion chip U5501

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Let's find the interrupt signal of the touch

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The pin 9 of the touch connector is the touch 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 CPU after passing through the fuse resistor R8102

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Let's find other detection signals of touch

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First look for MANY_SCAN, forced synchronization signal

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The pin 18 of the display seat is the forced synchronization signal

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Jump to the bitmap according to the name,

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this signal passes through the fuse resistor R8147

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and then connects to the power supply, camera power supply, baseband power supply and other chips

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Let's find the data clear signal of the touch screen

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The first pin of the touch connector is the touch 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 CPU after passing through the fuse resistor R8105

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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 display seat 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 connected to the CPU after passing through the fuse resistor R8130,

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and connected to the display screen through the resistor

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

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The 6th pin of the touch connector is the emission for the UART bus

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Jump to the bitmap according to the name,

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the emission signal is connected to the CPU after passing through the fuse resistor R8103

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The pin 12 of the touch connector is the receiver of the UART bus

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Jump to the bitmap according to the name,

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the receiver signal is connected to the CPU after passing through the fuse resistor R8104

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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