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How to use the schematic diagram

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This video mainly explains the comprehensive application of schematic diagram and bitmap

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Next, we will check the working conditions and wiring of the camera

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based on the fault that the iPhone 11 camera cannot be turned on

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First, open Xinzhizao software, find the mobile phone directory,

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and find the iPhone directory

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To overhaul the iPhone 11 models, you need to open the schematic diagrams,

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bitmaps and component maps

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First open the component map,

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the component map is convenient to recognize and identify the mainboard components

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Then open the bitmap, the bitmap can view the resistance and signal connection

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Open the schematic diagram

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If we want to check the camera line connection,

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first find the camera connection socket in the component map

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If any camera does not work, find its connector

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Take the wide-angle camera as an example,

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find the wide-angle camera connector at the same position on the bitmap

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The position number of the connection socket and the diode value of the pin will be marked in the bitmap

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If the difference between the measured value and the reference value is too large

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when measuring the diode value of the pin,

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it means that there is a problem with the line connected to the pin

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In the bitmap, you only need to click on the abnormal pin to know which components are connected to the pin

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If you want to analyze the power supply clock signal of the camera,

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you can jump to the drawing to view

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When jumping between the bitmap and the schematic diagram,

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the schematic diagram must be displayed on the first interface

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Then point the bitmap to select any pin or abnormal signal, and then click right button of the mouse

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The component can be found, and the signal of the pin can also be searched

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If you want to find the entire working principle of the camera,

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you only need to choose to find the schematic components

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After jumping to the schematic diagram,

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the current connection socket is the connection socket corresponding to the bitmap

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In the schematic diagram, it is easier to distinguish the power supply, clock signal and the signal of the camera

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For example, the power supply of the camera is 3.3V, 1.2V, 1.8V, 2.85V

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AVD2 power supply and PVDD power supply have a total of 6 power supplies

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When measuring these supplies,

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you can also jump from the schematic diagram to the point

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For example, after double-clicking the name of the power supply,

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click the right mouse button and choose to find the bitmap signal

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At this time, the yellow point in the bitmap can be used to measure the voltage after turning on the power

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If you want to measure whether the clock of the camera is normal,

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you can find the signal pin of the clock in the schematic diagram

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The mark CLK means the clock,

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double-click the clock name and right-click the mouse,

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select the search point bitmap signal

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At this time, the position of the yellow dot on the bitmap is the clock signal of the camera,

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and you can measure the clock signal after power on

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In actual maintenance, bitmap and schematic diagram will jump back and forth

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For example, if we want to check whether R7205 is a fuse resistor or a pull-up resistor

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Just click on the resistor, then right click on the mouse,

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select Find Schematic Components, then you can jump to the schematic diagram

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In the schematic diagram, you can see the parameters of the resistor

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The resistance is 0.00 ohm, which means it is a fuse resistor,

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and the signals on both sides of the fuse resistor are the same signal

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If you want to see where the signal is connected to in the bitmap,

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you need to click on the red solder point at the other end of the resistor

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After clicking, we can see that the signal will be connected to the chip U3700

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The measured value of this line is relatively low,

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which means that the capacitor is damaged

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Or the U3700 is damaged after passing the resistor,

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then if the measured value is relatively high

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If it shows more than 1,000, or OL,

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it means that the fuse resistor R7205 connected to the line may be damaged

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If the value at the R7205 end shows OL or is relatively large,

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it means that the board layer may be disconnected from the resistor to the chip position,

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and the chip needs to be removed

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In future maintenance, it is necessary to skillfully use bitmaps and schematic diagrams

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Ok, that's it for this lesson