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iPhone display circuit repair

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This video mainly explains how to view the circuit diagram of the iPhone 11 display circuit

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There is an abnormal working condition of the display screen, which will cause no display

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These signals need to be measured during maintenance,

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where to measure, or which component caused the problem after being detected

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Then we need to find the lines

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Step 1, first open the component map of iPhone 11 and find the display connector

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Step 2, determine the display connector position number in the bitmap

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Step 3, search for the position number of the display connector in the schematic diagram

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After finding the display connector,

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find the relevant pins according to the line identification

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Step 4, after finding the pins,

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jump to the bitmap to find the component connected to the line

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Next, let's find the relevant components of the iPhone 11 display circuit

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After logging in Xinzhizao,

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find the iPhone directory and find the iPhone 11

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Open the component map, bitmap and schematic diagram

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First find the display connector in the component map,

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and then find the corresponding connector in the bitmap

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Then jump to the schematic diagram

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We can first find the 1.8V power supply

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The second pin refers to the 1.8V power supply of the display

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Then jump to the bitmap to view the connected components

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After the signal comes, it will be filtered by two capacitors,

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and then connected to the inductor L8000

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Connect to the main power supply after passing through the inductor

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This power supply will be together with the CPU, hard disk, etc.

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If the power supply is not normal, it will lead to failure to start the machine,

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and the failure of the display circuit cannot be repaired

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

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it is generally because the inductor is damaged

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Let's find the I2C bus

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In the iPhone 11 schematic diagram, there is no I2C logo on the display connector

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Because the display information of iPhone 11 and XR models is stored in the screen touch chip,

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the display and touch seats are separated

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The chip that stores data is on the touch connector

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When the CPU reads the display information,

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it reads it through the touch seat,

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so the I2C bus cannot be found on the display seat

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I2C bus can be skipped during maintenance

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Let's find the reset signal of the display

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Find the pins marked RESET in the display socket

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The 12th pin of the display connector is the reset of the display

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The display reset signal of the iPhone 11 is output by the main power supply

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Jump to the bitmap, we can see that the reset signal passes through the resistor R8003,

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and then reaches the main power supply

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If the signal voltage is abnormal, it means that the components connected to the line are damaged

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It may be capacitor C8052 or resistor R8003

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After excluding the two components,

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if it is abnormal, it means that the main power supply is damaged

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Let's find the PWR_EN signal

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In the schematic diagram, the 14th pin of the display seat is the PWR_EN signal

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from the display to the display power supply

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Jump to the bitmap, we can see that the signal reaches the display power supply

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and the main power supply at the same time

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after passing through the resistor R8002

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

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These two power supplies are output by the display power supply

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In the schematic diagram, we can see that

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the first pin of the display seat is the negative 5.7V power supply,

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and the 4th pin is the positive 5.7V power supply of the display

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Jump to the bitmap

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The negative 5.7V power supply is connected to the display power supply through the inductor L8001

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The positive 5.7V power supply is connected to the display power supply through the inductor FL8000

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Let's find the MIPI display data transfer bus

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This line is connected to the CPU

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As can be seen in the schematic diagram,

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pins 5, 7, 11, 13, 17, 19, 23, and 25 are all marked with MIPI

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It means that these pins belong to the MIPI data transmission bus

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These 8 wires will pass through 8 inductors

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L8052, L8054, L8051 and L8050

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These inductors are inductors in parallel

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Their connection method is that pins 1 and 4 belong to an inductor,

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and pins 2 and 3 belong to an inductor

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One end of the inductors is all connected to the display seat,

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and the other end of the inductors is all connected to the CPU

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Next, let's find the anomaly detection signals

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This signal is sent by the main power supply

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It can be seen that pin 6 is an anomaly detection signal

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By viewing the bitmap, we can see that this line is connected to the resistor R8054

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and after the resistor it's connected to the main power supply

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In this way, we have searched all the signals related to the display circuit

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If the measurement is abnormal, replace the components connected to the line

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Ok, that's it for this lesson