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iPhone display circuit repairing

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This video mainly explains how to find the display circuit signals

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and measurement points of the iPhone 12 and 12Pro models

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Step 1, find the display connector in the 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 signal in the display connector according to the schematic diagram

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Step 4, jump to the bitmap to view the connected components

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The yellow position in the bitmap can measure the voltage and diode value

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When searching, we first open the iPhone 12 and 12 Pro component map, circuit diagram, and bitmap

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Find the display connector in the component map,

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and then determine the position number of the display connector in the bitmap

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Search for the position number in the schematic diagram

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After finding the display connector,

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find the corresponding signals according to the circuit diagram

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Let's find the 4.6V, 7.3V and -7V power supplies output by the display power supply to the display

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Pins 2, 4, 6 are negative 7V power supply

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Jump to the bitmap according to the name,

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the power supply is directly connected to the display power supply,

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and there is no fuse resistor in the middle

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Pins 39, 35, 36, 1, 3 are the 4.6V power supply

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Jump to the bitmap according to the name,

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the 4.6V power supply is also directly connected to the display power supply, without fuse

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Pin 15 of the display connector is the 7.3V power supply

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Jump to the bitmap according to the name,

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the 7.3V power supply is also directly connected to the display power supply,

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without fuse in the middle

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Let's find the MIPI bus start signal sent by the CPU to the display

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The 5th pin of the display connector is the bus turn-on signal

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Jump to the bitmap according to the name,

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the signal is directly connected to the CPU by the display socket

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Let's find the MIPI bus from the CPU to the display

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Pins 25, 26, 27, 28, 31, 32, 33, and 34

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MIPI is marked on each line, which is the MIPI bus

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Jump to the bitmap according to the name,

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the MIPI bus is directly connected to the CPU, without an inductor in the line

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All MIPI buses of the iPhone 12 series are directly connected to the CPU

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without a composite inductor in the middle

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If the MIPI bus is short-circuited, it is most likely because the CPU is damaged

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Let's find the image synchronization signal sent by the display to the CPU

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Pin 22 of the display connector is the image synchronization signal

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Jump to the bitmap according to the name,

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the synchronization signal is connected to the CPU by the connection socket,

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and there is no fuse in the line

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Let's look for other detection signals

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PANICB screen identification signal sent by the display power supply to the display

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Pin 11 of the display connector is the screen identification signal

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Jump to the bitmap according to the name,

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the signal is directly connected to the display power supply from the display connector, without fuse in the line

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Let's find the PANEL_ID screen ID code identification signal

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Pin 8 of the display connector is the screen ID 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 CPU after passing through the fuse resistor R11505

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We complete the signal search for the display circuits

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Pin 17 is the synchronous signal from the display screen to the touch screen

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Jump to the bitmap according to the name,

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In the bitmap, we can see that the signal is connected to the touch socket by the display connector,

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and is not connected to other chips

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When repairing the display fault, if the measured pin is abnormal,

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find the component connected to the signal according to the bitmap

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Ok, that's all for this video