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How to use bitmap

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In this lesson we're going to learn about the meanings of the bitmap marks of different models

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Let's take the iPhone 12 ProMax as an example to explain

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After opening the bitmap,

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we can see that the appearance shape of the bitmap is the same as that of the physical map

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The advantage of this is that when we look for chips or components,

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they can correspond to physical components

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In the bitmap, the red solder points represent useful signals,

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which may be power supply or signal lines

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If the red solder point falls off during welding, we need to refill it

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The gray solder point represents the ground wire,

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we can see that there are many gray dots in the bitmap

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The gray dot inside the chip also represents the ground wire

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In the physical board, the ground wires are all connected

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The blue solder points in the bitmap represent idle pins

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After zooming in on the bitmap,

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we can see that there are many blue dots inside the CPU

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If the blue dot falls off when we solder, we don't need to deal with it

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The bitmap also integrates the characteristic of the location diagram

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After we zoom in, we can see that each small component, connector or chip will have a number

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The meaning of the component number in the bitmap is the same

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as the meaning of the identification in the location diagram and circuit diagram

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U stands for chip, J stands for connector

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After we zoom in on the bitmap,

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we can see that there will be an English logo under the solder points

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The English logo represents the signal meaning of the solder point,

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There will also be a combination of letters and numbers on the top of the English logo,

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which is the coordinates of the solder points,

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corresponding to the coordinates of the line logo in the drawing

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After zooming out of the bitmap,

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we can see that there will be right-angled lines at the edge of the chip

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The right-angled line represents the direction of the chip,

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which corresponds to the direction of the chip on the physical mainboard

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Some chips will have numbers marked above the red solder points,

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indicating the reference value of the diode value

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Let's take a look at the meaning of the bitmap logo of Huawei P40 pro+ mobile phone

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After opening the bitmap,

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we can see that the shape and structure of the bitmap are the same as the shape of the physical mainboard,

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which is convenient for us to find the corresponding components

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After the bitmap is enlarged,

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we can see that the color logo of this model has the same meaning as the logo in Apple's

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Red dots represent useful signals, gray dots represent ground wires,

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and blue dots represent idle pins

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After zooming in on the bitmap, we can see many English signs,

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which correspond to those in the schematic diagram

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The identification of numbers and letters also represents coordinates

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After zooming out the bitmap,

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we can see that there is a right-angle mark on the edge,

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which represents the direction of the chip

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Through the comparison of the above two models,

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it is found that the meaning of the logo is the same

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Therefore, when repairing mobile phones,

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the viewing method of bitmaps of different mobile phones is the same

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Ok, that's all for this video