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芯片灯ichaiyang 2024-05-10 1:05 36
First, if the most common is breakdown damage, you can use a multimeter to measure the resistance or voltage of the power supply end of the chip to the ground, generally if within...

Chip light is good or bad check method?

First, if the most common is breakdown damage, you can use a multimeter to measure the resistance or voltage of the power supply end of the chip to the ground, generally if within dozens of ohms or the power supply voltage is lower than normal, most can be regarded as breakdown damage, you can disconnect the power supply end, and measure whether the power supply is normal. If the resistance measured is large, it is likely that other ports are damaged, you can also measure other ports one by one. See if there is a short-circuit port to the ground.

Second, specialized in detecting IC instruments, multimeters do not have this ability. Generally, the use of multimeters is to detect the pin voltage when it is used to make an approximate judgment, and there is no reliability. And the judgment is made under the condition of extremely familiar with this IC.

Extended data

Multimeter is a kind of magneto-electric instrument with rectifier, which can measure many kinds of electrical parameters such as AC, DC current, voltage and resistance. For each electrical quantity, there are generally several ranges. Also known as multi-meter or short for multi-meter. Multimeter is composed of magnetoelectric ammeter (meter head), measurement circuit and selection switch. A variety of electrical parameters can be measured conveniently through the transformation of selective switches. The main basis of circuit calculation is Ohm's law of closed circuit. There are many types of multimeters, and they should be selected according to different requirements when used.

The DC current stop of a multimeter is a multi-range DC voltmeter. The voltage range can be extended by parallel closed circuit divider. The DC voltage of a multimeter is a multi-range DC voltmeter. The meter head can be extended by connecting the divider resistance in series. The corresponding range is different with different voltage dividing resistors. The head of the multimeter is a magnetoelectric measuring mechanism, which can only pass DC and use a diode to change AC into DC, so as to achieve AC measurement.