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iPhone display circuit repairing

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This video mainly explains how to find the circuit of the iPhone XR display circuit

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If there is a problem with any signal in the display circuit, it will cause no display

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When repairing, it is necessary to find the relevant lines and damaged components of the lines

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How to find the iPhone XR lines

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Step 1, open the iPhone XR component map,

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and find the position number of the connection seat

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Step 2, go to the schematic diagram to find the display connector

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Step 3, find the corresponding pin position in the display seat logo

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Step 4, jump to the bitmap according to the names,

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and find the connected components of the line in the bitmap

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First open the component map, bitmap, and circuit diagram of the iPhone XR

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Find the position number of the connector in the component map,

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and then go to the circuit diagram to search for the position number

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After finding the connector, search for the corresponding signals

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First find the display 1.8V power supply

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Jump to the bitmap according to the power supply name

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As can be seen in the bitmap,

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the 1.8V power supply is first filtered by the capacitor C5706,

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and then connected to FL5705

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After passing the fuse,

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it is connected to the main power supply

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Display 1.8V power supply and CPU, hard disk 1.8V power supply is the same way

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In the maintenance, the 1.8V output of the power supply will not be damaged

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Because the damage will cause the CPU and hard disk to lack power supply, resulting in no boot

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If the 1.8V power supply of the display is abnormal,

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it is generally caused by the damage of the inductor FL5705

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Display I2C bus

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Observing the English logo in the schematic diagram, I2C bus was not found

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Because the display data storage chip of the XR model is integrated with the touch chip in the same module

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The touch chip of the XR model is on the touch cable,

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so there is no I2C detection bus on the display seat

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When repairing the XR display circuit, the I2C bus can be skipped first

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Let's find the reset signal of the display

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If RESET is found in the English identification of the pin,

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and it is marked DISPLAY, it is the reset signal of the display

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Pin 15 is the reset signal of the display

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After selecting the signal, jump to the bitmap,

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we can see that the reset signal is first filtered by capacitor C5752, and then reaches FL5752

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After passing through the fuse, it connects to the main power supply

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The reset signal of the XR model is provided by the main power supply

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Let's find the PWR_EN signal sent by the display to the display power supply

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In the schematic diagram, the 13th pin of the display seat is the power-on signal

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given by the display screen to the display power supply

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Jump to the bitmap by the pin

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The PWR_EN signal is first filtered by the capacitor C5750,

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and then reaches the inductor FL5750

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After passing through the inductor,

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it reaches the main power supply and the display power supply at the same time

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Let's find the positive and negative 5.7V power supply of the display

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In the schematic diagram, the 23rd pin of the display seat,

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PP5V7 is the positive 5.7 power supply of the display

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The 26th pin PN5V7 is the negative power supply

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Jump to the bitmap by the pin

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The negative 5.7V power supply is connected to the inductor FL5710

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After passing through the inductor,

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it directly reaches the display power supply U5500

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The positive 5.7V is connected to the inductor FL5700

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After passing through the inductor,

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it reaches the A3 pin of the display power supply U5500

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

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The schematic diagram shows the pins 2, 4, 8, 10, 14, 16, 20, 22 of the display connector

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These 8 lines belong to the MIPI bus of the display

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Jump to the bitmap according to the line name

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L5750, L5751, L5754, L5752 are all inductors in parallel

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They are a separate inductor up and down, left and right are irrelevant

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The upper end of the inductor is all connected to the display seat,

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and the lower end of the inductor is all connected to the CPU

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Let's look for the anomaly detection signal from the power supply to the display

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Pin 21 is the anomaly detection signal, jump to the bitmap according to the name

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The signal is first connected to R5754,

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and then reaches the main power supply after passing through the resistor

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In this way, we have searched all the relevant signals of the display circuit

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If the pin, value or voltage is found to be abnormal during the maintenance in the future,

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it means that the components connected to the line are damaged

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Ok, that's all for this video