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Usage of location diagram

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In this lesson, we mainly learn how to view the location diagram

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The location diagram is consistent with the physical diagram,

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and each component in the location diagram has a number

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In the location diagram, the components correspond to the real object,

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and in the location diagram, the component numbers are unique

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For example, CPU chip,

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the number in the location diagram is U1000

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The location diagram is also called the component distribution diagram,

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component diagram, bit number diagram,

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board location diagram, etc.,

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they are all the same

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How to view the location diagram

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Component numbers

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The numbers of the different components in the location diagram are also different

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In the location diagram, letter U represents the integrated chip,

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for example, U2700 and U1000 both represent the integrated chip

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J stands for the connection socket

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In Android models, some connection sockets are identified by P or CN

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R stands for resistor, C stands for capacitor

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L/ FL stands for inductor, D/ DZ stands for diode

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Q stands for MOS tube, and in some circuit diagrams, Q also stands for triode

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Because in the mobile phone, the transistors are all integrated,

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so Q only represents the MOS tube

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In addition to numbering each component in the location diagram,

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there are some other identifications

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In Apple models, red dots, red squares,

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or stars represent the orientation of components

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In the physical picture, we can see that each component will have a small dot,

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which represents the direction of the chip

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When welding, if we forget the direction,

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we can open the location diagram, check the corresponding red mark or dot,

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find the direction, and start welding

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In Huawei mobile phones, slashes are used on components,

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and dots represent the direction of components

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In OPPO mobile phones, there are some component marks

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Some models use black right angles, black dots,

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slashes, dots, or black triangles in the location diagram

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These marks represent the chip directions

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Summarize

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Regardless of whether it is an Apple model or an Android model,

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the markings in the chip location diagram represent the direction of the chip

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When welding, if we forget the direction,

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we can weld according to the component direction of the location diagram

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Ok, that's all for this video