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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 XS

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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 looking up the maps, first open the iPhone XS component map, 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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iPhone XS and X are only different in the detection signals,

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the main signals and working principles are the same

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First find the 1.8V power supply of the touch screen

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The 14th pin of the touch connector is the 1.8V power supply

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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 FL5890,

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and connected to the touch power supply

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

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The 21st pin of the touch connector is the 32KHz clock signal

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Jump to the bitmap according to the name,

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the 32KHz clock signal is connected to the main power supply after passing through the fuse resistor R5842

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Let's find the I2C bus from the CPU to the touch screen

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The 23rd pin of the touch connector is the I2C bus data

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Jump to the bitmap according to the name,

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the bus data is directly connected to the CPU, and the touch power supply is also connected

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Pin 25 of the touch connector is the bus clock

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Jump to the bitmap according to the name,

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the bus clock is also directly connected to the CPU, and also connected to the touch power supply

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Explain that the I2C bus of the touch power supply and the touch screen is the same group

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Let's find the 1.1V power supply of the touch screen

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The 18th pin of the touch connector is the 1.1V power supply

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Jump to the bitmap according to the name,

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the 1.1V power supply passes through the fuse inductor FL5896 and then connects to the touch power supply

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Let's find the negative 6.7V power supply,

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10V power supply, and 3.5V power supply of the touch screen

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The pin 20 of the touch connector is the negative 6.7V power supply

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Jump to the bitmap according to the name,

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the power supply is connected to the touch power supply after passing through the fuse inductor FL5894

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The 22nd pin of the touch connector is the 3.5V power supply

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Jump to the bitmap according to the name,

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the power supply is connected to the touch power supply after passing through the fuse inductor FL5893

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The 8th pin of the touch connector is the 10V power supply

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Jump to the bitmap according to the name,

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the 10V power supply passes through the fuse inductor FL5895 and then connects to the touch power supply

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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 4 lines

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The first 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 clock signal passes through the fuse resistor R5807 and then connects to the resistor R1461,

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and then onnects to the CPU

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

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The 3rd pin of the touch connector is the SPI bus chip selection pin

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Jump to the bitmap according to the name,

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and the chip selection signal is connected to the CPU after passing through the fuse inductor FL5806

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The 2nd pin of the touch connector is the SPI bus data input

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Jump to the bitmap according to the name,

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and the data input signal is connected to the CPU after passing through the fuse inductor FL 5809

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The 4th pin of the touch connector is the SPI bus data output

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Jump to the bitmap according to the name,

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and the data output is connected to the CPU after passing through the fuse inductor FL5810

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Let's find the 5.25V turn-on signal sent by the touch screen to the touch power supply

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The 26th pin of the touch connector is a 5.25V turn-on signal

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Jump to the bitmap according to the name,

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and the turn-on signal is connected to the touch power supply after passing through the fuse inductor FL5840

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Let's find the 5.25V power supply of the touch screen

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The 28th pin of the touch connector is the 5.25V power supply

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Jump to the bitmap according to the name,

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the power supply passes through the fuse inductor FL5891 and then connects to the touch 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 6th 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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and the interrupt signal is connected to the CPU after passing through the fuse inductor FL5802

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

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Ok, that's all for this video