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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 of the iPhone X

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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,

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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 maps, first open the iPhone X component map,

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circuit 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 look for other detection signals

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AMUX signal

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Pin 27 of the touch connector is the AMUX signal

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Jump to the bitmap according to the name,

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the AMUX signal is connected to the main power supply after passing through the fuse inductor FL5841

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SCAN scanning signal

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The 7th pin of the touch connector is the scanning signal, SCAN

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Jump to the bitmap according to the name,

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the scanning signal is connected to the touch power supply after passing through the fuse inductor FL5805

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Let's find the SWD from the CPU to the touch screen, the serial debug bus

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Pin 9 of the touch connector is the serial bus clock

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Jump to the bitmap according to the name,

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the serial bus clock is connected to the CPU after passing through the fuse resistor R5844,

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and connected to the hard disk at the same time

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Pin 11 of the touch connector is serial data

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Jump to the bitmap according to the name,

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the serial data is connected to the CPU after passing the fuse inductor FL5845

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

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The 10th pin of the touch connector is the UART bus receiving

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Jump to the bitmap according to the name,

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and the receiving signal is connected to the CPU after passing through the fuse inductor FL5804

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The 12th 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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and the emission signal is connected to the CPU after passing through the fuse inductor FL5803

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Let's find the reference clock from the CPU to the touch screen

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The 17th pin of the touch connector is the reference clock

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Jump to the bitmap according to the name,

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the reference clock is firstly connected to the fuse resistor R5801 through the coupling capacitor C5860

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Then connect to resistor R1481, and then connect to the CPU

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The reference clock is connected to the touch connector through two fuse resistors and a coupling capacitor

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

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The 24th 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 synchronization signal is connected to the CPU after passing through the fuse inductor FL5847,

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and connected to other chips

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Let's find the Hall interrupt signal

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The 13th pin of the touch connector is the Hall interrupt 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 inductor FL5850

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

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When troubleshooting a no touch fault, if any pin value is found to be abnormal,

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we will measure the components connected to the pin, or replace the components

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Ok, that's all for this video