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iPhone touch circuit repairing

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This lesson mainly explains how to find the iPhone XR touch ciruit 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 signal 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 search the diagrams, we first open the iPhone XR's 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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First find the 1.8V power supply of the touch screen

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The first pin of the touch connector a 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 passes through the fuse inductor FL5802

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and then connects to the main power supply

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Let's find the I2C bus

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The second pin of the touch connector is the I2C bus clock

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Jump to the bitmap according to the name, the I2C bus clock is directly connected to the CPU

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The 6th pin of the touch connector is the I2C bus data

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Jump to the bitmap according to the name, the bus data is also directly connected to the CPU

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This group of I2C buses is mainly used by the CPU to read the data in the screen storage chip on the touch cable

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

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The pin 18 of the touch connector is a 32KHz clock signal

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Jump to the bitmap according to the name,

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the clock signal is connected to the main power supply after passing through the fuse resistor R5803

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Let's find the reset signal of the touch screen

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The 8th pin of the touch connector is the reset signal

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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 inductor FL5878

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Let's find the SPI bus

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The SPI bus has a total of 4 lines,

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and the 11th pin of the touch connector is the SPI bus chip selection

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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 FL5870

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The 13th 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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the data output pin is connected to the CPU after passing through the fuse inductor FL5876

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The 15th 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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the data input pin is connected to the CPU after passing through the fuse resistor R5874

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The 17th 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 first passes through R5872,

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then connects to the fuse resistor R1461,

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and then connects to the CPU

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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 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 FL5825 and then connects to the display power supply

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Let's find the interrupt signal

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The 4th 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 FL5866

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

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Let's look for other detection signals

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MANY_SCAN synchronization signal

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In iPhone XR model, the 9th pin of the display seat is a synchronization signal,

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and the logo is slightly different

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Jump to the bitmap according to the name,

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the forced synchronization signal passes through the fuse inductor FL5864 and then connects to other chips,

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including CPU, baseband, power supply, main power supply, etc.

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Let's find the touch data clear signal

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The 14th 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 inductor FL5862

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Let's find the clock detection signal from the CPU to the touch screen

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The 10th pin of the touch connector is the clock detection signal

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Jump to the bitmap according to the name,

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the clock detection signal is connected to the CPU after passing through the fuse inductor FL5860

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Let's find the UART bus

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The pin 7 of the touch connector is UART bus receiving

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Jump to the bitmap according to the name,

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the receiving signal is connected to the CPU after passing through the fuse inductor FL5881

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The pin 12 of the touch connector is the emission signal for the UART bus

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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 FL5882

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

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In iPhone XR model, the 5th pin of the touch connector is the 1.8V EEPROM power supply

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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 after passing through the fuse inductor FL5880

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We also need to measure it during maintenance

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Okay, that's all for this video