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iPhone touch circuit repairing

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This video mainly explains the commonly used terms of touch circuits

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Understanding these terms can help us find schematic diagram more quickly

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In the touch circuit, TOUCH stands for touch

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RACER also stands for touch, generally used in iPhone X and above models

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CUMULUS represents the main touch in iPhone 6 to iPhone 8P

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MESON stands for vice touch

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CLK32K represents a 32.768KHz clock signal

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RESET represents the reset signal

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SPI stands for Serial Data Bus

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INT stands for interrupt signal

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BSYNC represents the synchronization signal

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MOSI stands for data input

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MISO stands for data output

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EN represents the enable signal

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SWD stands for Serial Debug Bus

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We must master these terms when we learn the touch circuits

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Let's look at some terms in the schematic diagram

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For example, the iPhone 8P model,

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the display and touch are on the same connector

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When we want to find the touch signal, we need to keep in mind the terms

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For example, the 11th pin of the display connector, AP_TO_TOUCH_CLK32K

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This signal represents the 32KHz clock signal from the CPU to the touch

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The pin 21 PP1V8_TOUCH of the display connector represents the 1.8V power supply of the touch

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Pin 18 is identified as PP1V8_DISPLAY,

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which represents the 1.8V power supply of the display

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When looking for a touch circuit,

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we don't need to look at the signal of the display

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For example, in the iPhone XS touch schematic diagram,

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many signals on the touch connector mark RACER

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RACER represents the touch signal

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Ok, that's all for this video