Capacitor Failure Analysis Principle

Capacitors are one of the most widely used electronic components in electronic devices, used in coupling, bypass, filtering, and tuning loops. The failure analysis of capacitors should follow the relevant principles. Some commonly used principles are as follows:

1. The principle of primary and secondary

Generally, the primary secondary is judged by the degree to which the fault affects the function. After clarifying the main secondary issues, first solve the main problems and then solve the secondary problems;

2. The principle of operation after the scheme

In the failure analysis, the analyst must first calm down, think of the solution in the brain and then operate, do not blindly operate, and then cause other larger capacitors to fail;

3. First general after the special principle

First check the location where the failure often occurs, and then check the location where there is less failure;

4. The principle of strong electricity after weakening first

Generally, in the face of a faulty whole machine or a failed capacitor, when the performance is detected or the fault location is judged, the input signal, power supply, etc., are weak to strong depending on the specific situation. It is worth reminding that in the whole change from weak to strong, we must closely observe and record the abnormal phenomenon. In addition, it is necessary to prevent sudden power-on and power-off caused by over-power, causing power shocks, eventually disrupting the failure state, and increasing the difficulty of failure analysis.

In addition to the above, there are also simple and complex, first security after power-on, first macro-micro, first peripheral after the host, first static and dynamic, first power-off after replacement, first public and then dedicated.