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iPhone touch circuit repairing

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This video mainly explains how to find the iPhone 8P touch circuit signals and measurement points

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Search method step 1,

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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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Before looking for signals, we first open the iPhone 8P's component map, circuit diagram and bitmap

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Find the touch connector in the component map

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iPhone 8P display connector and touch connector is the same one

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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 1.8V power supply of the touch screen first

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The 21st pin of the display seat supplies 1.8V power supply to the touch screen

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Jump to the bitmap according to the name,

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the 1.8V power supply is connected to the main power supply after passing through the fuse inductor FL5720

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Let's find the positive and negative 5.7V power supply of the touch screen

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The 25th pin of the display seat supplies the positive 5.7V of the touch screen

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Jump to the bitmap according to the name,

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the 5.7V power supply is connected to the display power supply through the fuse inductor FL5715

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The 23rd pin of the display seat supplies the negative 5.7V power supply to the touch screen

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Jump to the bitmap according to the name,

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the negative 5.7V power supply passes through the fuse inductor FL5710

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and then connects to the display power supply

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Let's find the 32KHz clock signal of the touch screen

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The 11th pin of the connector is the 32KHz clock signal of the touch

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Jump to the bitmap according to the name,

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the clock signal is connected to the CPU after passing through the fuse resistor R5768

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Let's find the reset signal of the touch screen

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The 10th pin of the display touch connector is the reset signal of the touch screen

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Jump to the bitmap according to the name,

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the reset signal is connected to the CPU after passing through the fuse resistor FL5778

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

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The SPI bus has a total of 4 lines,

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and the 7th pin of the touch connector is the data output of the SPI bus

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Jump to the bitmap according to the name,

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the data output pin is connected to the CPU after passing through the fuse inductor FL5776

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The 9th pin of the touch connector is the chip selection pin of the SPI bus

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Jump to the bitmap according to the name,

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the chip selection signal is connected to the CPU after passing through the fuse inductor FL5770

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The 13th pin of the touch connector is the SPI bus clock

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Jump to the bitmap according to the name,

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the SPI bus clock is connected to the fuse resistor R1461 after passing through the fuse resistor R5772,

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and then connected to the CPU after passing through the resistor

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The SPI bus clock is connected to the CPU after passing through two fuse resistors

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The 6th pin of the touch connector is the data input of the SPI bus

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Jump to the bitmap according to the name,

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the data input pin is connected to the CPU after passing through the fuse inductor FL5774

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

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Pin 19 of the touch connector is the 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 passes through the fuse inductor FL5725 and then connects to the display power supply

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

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The 8th pin of the touch connector is the interrupt signal of the touch screen

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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 inductor FL5766

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

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Ok, that's all for this video