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How to use the location diagram

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In this lesson we learn how to view the location diagram in different models

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Let's first look at the location diagram of the iPhone

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First open the location diagram of iPhone 11, and the physical scan map

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The mainboard of the iPhone 11 is a double-layer mainboard with components on three sides

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The location diagram will mark the information of each side,

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even the side without components will be marked

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After zooming in on the location diagram,

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we can see that there are numbers on each component,

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and different numbers represent different components

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C stands for capacitor and L stands for inductor

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R stands for resistor, and U stands for chip

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The number of each component will correspond to the component in the physical drawing

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In the iPhone 11 location diagram, some chips will have an asterisk mark,

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representing the direction of welding

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In the physical picture, there will also be a dot mark on the chip

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In maintenance, if we forget the direction of the components,

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we can weld according to the direction marked on the location diagram

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Let's check Huawei's location diagram

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Open the location diagram of P40 pro+ and zoom in on the location diagram

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We can see the number of small components and the number of the chip,

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which is the same as the location diagram of the iPhone

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But the direction of the chip, it's marked with a bevel, not an asterisk

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Some components are marked with small white circles,

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which all represent the direction of the components

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Let's open the location diagram of OPPO R15S

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After zooming in, we can also see the numbers of small components

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In this location diagram, the direction of the chip,

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it will be marked with bevels and circles

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In the location diagram below the R15S,

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you can also see its direction mark, with black circles and triangle symbols

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Let's take a look at the location diagram of Vivo

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Let's open the location diagram of Y91S

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After zooming in, we can see that the component numbers are the same,

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and the chip numbers are also the same

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The direction of Vivo's chip will be marked with a bevel and a small circle

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Now let's open the location diagram of Xiaomi 10 PRO

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We can see that the serial numbers of small components and chips are the same

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In this location diagram, the direction of the component is marked with a triangle,

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and a vertical line is drawn inside the triangle,

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which is a little different from the previous models

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The location diagrams of the above models,

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the direction marks of the chips are similar

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Ok, that's all for this video