Teach you to see through the cause of circuit failure

by:V&T Technologies     2019-11-10
Failure caused by capacitor damage is the highest among electronic devices, especially electrolytic capacitor damage is the most common. Capacitor damage is manifested as: capacity becomes smaller; Completely lost capacity; Leakage; Short Circuit. Capacitors play different roles in the circuit, and the faults caused by them also have their own characteristics. In industrial control circuit boards, digital circuits account for the vast majority, capacitors are mostly used for power filtering, and capacitors used for signal coupling and oscillation circuits are less. If the electrolytic capacitor used in the switching power supply is damaged, the switching power supply may not vibrate and there is no voltage output; Or the output voltage filtering is not good, and the circuit has logic confusion due to unstable voltage, which shows that the machine works well or badly or cannot be turned on. If the capacitor is between the positive and negative poles of the power supply of the digital circuit, fault performance ibid. This is especially obvious on the computer motherboard. Many computers have been used for a few years, sometimes they can't open the machine, sometimes they can boot, open the chassis, it is often seen that there is an electrolytic capacitor bulging phenomenon. If the capacitor is removed and the capacity is measured, it is found to be much lower than the actual value.
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