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iPhone display circuit repairing

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This video mainly explains how to find the display signals and measurement points of the iPhone X

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Display circuit diagram query method

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Step 1, find the display connector in the component map and determine the position number

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Step 2, search for the position number in the schematic diagram

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Step 3, find the corresponding signal in the circuit diagram according to the pin label

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Step 4, jump to the bitmap according to the pin position in the circuit diagram, and find the connected components

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The voltage and diode value can be measured at the yellow points in the bitmap

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Before looking for the signal, we first open the iPhone X's component map, circuit diagram and bitmap

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Find the display connector in the component map,

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the position number of the display connector is J5700

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Let's search for J5700 in the schematic diagram

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After finding the display connector,

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find the corresponding signal in the schematic diagram

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according to the identification in the working principle diagram

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Let's first find PP_VDD_MAIN, the main power supply

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In the schematic diagram, pins 35, 36, 2 and 4 of the display connector are PP_VDD_MAIN,

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Jump to the bitmap by the name

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The power supply will not be damaged during actual maintenance,

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because after the power supply is damaged, it will cause a short circuit fault

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Let's find out the 3V, 1.8V and 1.0V power supplies that the main power supply sends to the display

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In the schematic diagram, pin 1 is the 1.8V power supply of the display connector

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Jump to the bitmap according to the name,

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the 1.8V power supply will be connected to the main power supply through the fuse inductor FL5780

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The 1.8V power supply will be connected with the CPU and hard disk power supply

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When repairing the display faults, if there is no 1.8V power supply,

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it is most likely because the inductor FL5780 is damaged

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In the schematic diagram, the 8th pin 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 power supply will be connected to the main power supply through the inductor FL5783

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In the schematic diagram, the 12th pin is 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 will be connected to the main power supply through the inductor FL5782

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If the 3V and 1.8V power supplies are abnormal,

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it is most likely because the fuse inductors on the line are damaged

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Let's find the reset signal sent by the CPU to the display

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In the schematic diagram, the 5th pin is the reset signal

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Jump to the bitmap according to the name,

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the reset signal is connected to the CPU after passing through the fuse inductor FL5700

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Let's find the activation signal, ALIVE

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In the schematic diagram, the 20th pin is the activation signal,

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which is sent to the CPU by the display screen

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Jump to the bitmap according to the name,

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the activation signal is connected to the CPU after passing through the fuse inductor FL5702

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Let's find the interrupt signal

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In the schematic diagram, pin 16 of the display connector is an interrupt signal,

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which is sent to the display screen by the CPU

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Jump to the bitmap according to the name,

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the signal is connected to the CPU after passing through the fuse inductor FL5704

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Let's find the MIPI bus

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In the schematic diagram, pins 19, 21, 25, 27, 31, 33, 26, 28, 32, and 34

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of the display connector are all marked with MIPI

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These lines are all MIPI buses

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The MIPI bus will be connected to the CPU through an inductor

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Jump to the bitmap according to the name, we can see that

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there are 5 composite inductors on the edge of the display connector

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They are L5720, L5740, L5730, L5710, and L5700

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Among these composite inductors, pins 1 and 4 are an inductor,

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pins 2 and 3 are an inductor, and there is no relationship between them

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One end of the composite inductor close to the display connector is connected to the display connector,

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and the other end is connected to the CPU

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Each MIPI bus passes through an inductor

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Let's find the signal used by the main power supply to monitor the display power supply, ADCMUX

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In the schematic diagram, the third pin of the display connector is the ADCMUX signal

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Jump to the bitmap according to the signal name,

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the signal is connected to the main power supply after passing through the fuse inductor FL5703

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Let's find the signal of the main power monitoring display, PANICB

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In the schematic diagram, the 9th pin of the display connector is the PANICB 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 after passing through the fuse resistor R5701

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We have completed the search for the relevant signals for the display circuit

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The NC marked in the schematic diagram means that it is an unused pin,

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we don't need to look for it

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Ok, that's all for this video