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iPhone display circuit repairing
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This video mainly explains how to find the iPhone 11 Pro display circuit signals and measurement points
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Step 1, find the display connector in the iPhone 11 Pro component map
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Step 2, find the display connector in the bitmap and confirm the position number
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Step 3, search for the position number in the schematic diagram,
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and find the corresponding signals
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Step 4, jump to the bitmap according to the logo, and view the connected components
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The voltage and diode value can be measured at the position at the yellow points in the bitmap
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Before looking for the signals, we first open the component map,
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schematic diagram and bitmap of the iPhone 11 Pro
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Find the display connector in the component map,
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and then find the display connector in the bitmap,
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Confirm the display connector position number
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Then search for the display connector in the schematic diagram
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After finding the display connector, find the corresponding signals
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First look for PP_VDD_MAIN, the main power supply
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The 41, 37, 38, 1, 2, 3, 4 pins of the display connector are the main power supply
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Jump to the bitmap according to the name,
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the positive pole of the battery connector of the iPhone 11 Promax model is the main power supply
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If there is a problem with the main power supply, it will cause a short circuit fault
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Let's find the 3V, 1.8V and 1V power supplies sent by the main power supply to the display
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In the schematic diagram, pin 14 is 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 inductor FL8080 and then connects to the main power supply
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The power supply will be connected with the hard disk and CPU power supply
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When repairing the display circuit, if the 1.8V power supply of the display connector cannot be measured,
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it is most likely because the inductor FL8080 is damaged
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Pin 16 is the 3V power supply for the display
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Jump to the bitmap according to the name,
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the 3V power supply is connected to the main power supply after passing through the fuse inductor FL8083
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Pin 18 of the display connector is the 1V power supply for the display
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Jump to the bitmap according to the name,
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The power supply is directly connected to the main power supply
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Let's find the clock signal sent by the main power supply to the display
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The 17th pin is the 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 through the fuse resistor R8009
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Next, look for the reset signal of the display
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Pin 12 of the display connector is the reset signal for the display
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Jump to the bitmap according to the name,
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the reset signal is connected to the main power supply after passing through the fuse resistor R8000
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If the clock and reset signals are abnormal,
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It is most likely because the fuse resistors are damaged
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Let's find the interrupt signal sent by the CPU to the display
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Pin 15 of the display 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 connected to the CPU after passing through the fuse resistor R8004
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Let's find the MIPI display bus
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In the schematic diagram, pins 21, 23, 27, 29, 33, 35, 28, 30, 34, 36 are MIPI buses
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MIPI is marked on each line
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According to the logo, jump to the bitmap
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There are 5 composite inductors near the display connector,
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They are L8030, L8040, L8020, L8000, and L8010
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In the composite inductors, pins 1 and 4 are an inductor,
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and pins 2 and 3 are an inductor
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The inductor of pins 2 and 3 has nothing to do with the inductor of pins 1 and 4
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Each data line of the MIPI bus is connected to an inductor
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The pins of the composite inductors near the display connector are all connected to the display connector,
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and the other ends are all connected to the CPU
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If an inductor is damaged, it will cause no display
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Let's find the TE picture synchronization signal
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Pin 24 is the synchronous signal of the display
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Jump to the bitmap according to the name,
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the synchronization signal is connected to the CPU after passing through the fuse resistor R8006
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Let's find other detection signals
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PANICB, the signal of the main power detection display
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The 10th pin of the display connector is the identification signal
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Jump to the bitmap according to the name,
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the identification signal is connected to the main power supply through the resistor R8001
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Let's find the ADCMUX signal
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The 8th pin is ADCMUX 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 through the fuse resistor R8003
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Let's find the PANEL_ID identification signal
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The 7th pin is the ID identification signal
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Jump to the bitmap according to the name,
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the ID identification signal is connected to the CPU after passing through the fuse resistor R8005
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Let's find the touch synchronization signal sent by the display to the CPU
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Pin 22 is the touch synchronization signal from the display screen to the CPU
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Jump to the bitmap according to the name, and the touch synchronization signal is connected to the CPU
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after passing through the fuse resistor R8007
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This way, we have completed the search for the relevant signals of the display circuit
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When overhauling no display fault, if there is an abnormal value measured on the pin,
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we can find the relevant components in the bitmap according to the line
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Ok, that's it for this lesson
