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How to use bitmap

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In this video, we mainly learn the meaning of colors and marks in the bitmap

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The mobile phone bitmap is made by combining the physical map,

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circuit diagram and location diagram

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The bitmap has the outline structure of the physical diagram,

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the component number of the location diagram,

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the signal names and pin coordinates in the circuit diagram and other informations

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The bitmap has the characteristic of simple search signal,

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convenient and easy to understand,

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and is an indispensable auxiliary maintenance software for maintenance personnel

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Different default colors or marks in the bitmap represent different meanings

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Red represents a useful signal,

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indicating that the solder point may be a power supply or a signal

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

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The gray dot in the bitmap represents the ground wire,

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and the ground wires are connected in the bitmap

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The blue solder points in the bitmap represent idle spots,

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indicating that this line is not used

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If the solder points fall off, we do not need to deal with them

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Let's understand the different marks in the bitmap

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In the bitmap, the number above the red solder point represents the diode value,

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which can be used as a reference value during measurement

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The red solder point will be marked in English,

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which is the same as the English mark in the drawing,

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representing the signal meaning of the solder point

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Letters and numbers will be marked above the solder points in the bitmap,

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and the letters and numbers are relatively large,

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and the identification is the coordinates of the solder points

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Most of the BGA chip pins are identified by coordinates,

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and the combination of numbers and letters represents the pin of the BGA chip

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In the bitmap, there will be a double-line mark at the edge of the chip,

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it represents the direction of the chip

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Same meaning as an asterisk or a small red dot in the location diagram

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The mark starting with U in the middle of the chip is the position number,

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which is the same as the position number marked in the circuit diagram and location diagram

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Ok, that's all for this video