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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 iPhone 12 Promax
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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, 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 diagrams, first open the 12 Promax component map,
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schematic 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 find the 1.8V power supply for the touch screen
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The pin 52 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 directly connected to the main power supply,
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and connected to the touch chip
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Explain that the 1.8V power supply of the touch screen and the touch chip is the same way
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Let's find the I2C bus from the CPU to the touch screen
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The pins 38 and 40 of the touch connector are the I2C buses
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Pin 38 is the bus clock
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Jump to the bitmap according to the name,
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the clock signal is directly connected to the CPU and the touch chip
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Pin 40 is the bus data
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Jump to the bitmap according to the name,
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the data signal is also directly connected to the CPU and the touch chip
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Let's find the 32KHz clock signal of the touch screen
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The pin 48 of the touch connector is 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 resistor R11710
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Let's find the reset signal of the touch screen
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The reset signal is sent by the touch chip
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Pin 46 of the touch connector is the touch reset signal
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Jump to the bitmap according to the name,
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the reset signal is directly connected to the touch chip, not connected to other chips
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Let's find the SPI bus of the touch screen
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SPI bus has 4 lines
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Pin 45 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 touch chip after passing through the fuse resistor R11700
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The 47th 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 directly connected to the touch chip,
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without fuse in the middle
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Pin 49 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 is also directly connected to the touch chip,
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and no other components are connected
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Pin 42 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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the chip selection signal is also directly connected to the touch chip,
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and no other components are connected
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Let's find the turn-on signal from the touch chip to the main power supply
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First find the touch chip in the component map,
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and determine the position number of the touch chip in the bitmap
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Then search for the position number in the schematic diagram
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The D3 pin of the touch chip is the turn-on signal
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Jump to the bitmap according to the name,
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the turn-on signal is directly connected to the main power supply by the touch chip,
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without fuse in the middle,
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and no other components are connected
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Let's find the 3.1V power supply of the touch screen
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The pin 50 of the touch connector is the 3.1V power supply
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Jump to the bitmap according to the name,
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the 3.1V power supply is connected to the main power supply after passing through the fuse resistor R11796,
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and is also connected to the touch chip
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Let's find the interrupt signal from the touch screen to the touch chip
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Pin 44 of the touch connector is an interrupt signal
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Jump to the bitmap according to the name,
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the interrupt signal is directly connected to the touch chip, without fuse in the middle
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In this way, we have searched all the signals of the touch circuit
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Let's look for other detection signals
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MANY_SCAN, the forced synchronization signal from the touch screen to the main power supply,
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touch chip, camera power supply and other chips
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The pin 51 of the touch connector is the forced synchronization signal
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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, touch chip,
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camera power supply and other chips
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Let's find the two synchronization signals from the touch connector to the touch chip
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The pin 17 of the touch connector is the first synchronous signal
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Jump to the bitmap according to the name,
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the signal is directly connected to the touch chip without connecting other components
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The third pin of the touch connector is the second touch synchronization signal
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Jump to the bitmap according to the name,
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the signal is also directly connected to the touch chip,
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without connecting other components
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Let's find the ID identification signal from the USB to the touch connector
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Pin 43 is the ID identification signal from the USB to the touch connector
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Jump to the bitmap according to the name,
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the signal is directly connected to the USB chip,
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without connecting other components
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In this way, we have searched all the signals in the block diagram
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Ok, that's all for this video
