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Recognition and Measurement of Electronic Components

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This video mainly explains the voltage division of series resistors, judging the quality of resistors,

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and the principle of resistor substitution

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There are many ways to connect resistors in the circuit

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A single resistor is commonly used in mobile phone mainboards,

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and occasionally resistors are used in series

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After the resistors are connected in series,

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a voltage divider will be generated, such as in the picture

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Resistor series method and resistor series voltage division calculation formula

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If it is troublesome for us to calculate according to the calculation formula,

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we can use the series voltage divider software

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We only need to input the corresponding voltage and resistance value

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to get the voltage value of the voltage division point

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Good or bad judgment of resistor

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The multimeter is adjusted to the ohm range,

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and the test markers measure both ends of the resistor

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If the measured value is consistent with the value marked in the drawing,

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it means that the resistor is normal

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Precautions for Measuring Resistor

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After the resistor is damaged, the resistance value will generally increase

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The resistance value is inaccurate when measured on the mainboard

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If we want to accurately judge whether the resistor is good or bad,

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we need to remove it from the mainboard for measurement

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The principle of resistor substitution is the same parameter and the same size substitution

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However, in actual maintenance,

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generally we can use wires to directly connect the fuse resistors

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We can remove the thermistor, or replace it with one with the same parameters

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Ok, that's all for this video