Fuse tube blown fault
Thread Content
After a computer with an ordinary configuration was powered on, it was found that the power supply had no voltage output. After testing the power supply, it was found that the fuse tube was blown. After replacement, it was found that the newly replaced fuse tube was blown again when the computer was turned on. According to the analysis, the fuse tube keeps blowing, and it is speculated that the cause of the fault may be the breakdown of the rectifier bridge in the circuit, the breakdown of the large electrolytic capacitor, or the breakdown of the primary switch tube. Based on this, the rectifier bridge circuit and the large electrolytic capacitor were tested, and no abnormalities were found. When measuring the primary switching tube, it was found that it was broken down, thus causing the above failure. In the troubleshooting process, purchase a new switching tube of the same specification based on the cause of the fault. After replacing it, restart the computer. Everything will run normally and the fault will be eliminated.
lThe author’s analysis is very correct. I will share with you my little experience about the fuse tube melting failure that I encountered at work.: When the fuse fuses, there are only very few traces of copper wire melting on the inner wall of the fuse glass, indicating that the short circuit in the power supply is not very serious. ； If the inner wall of the fuse glass turns black or even cracks, it means the short circuit is very serious. You must use a multimeter to find the short circuit point, then replace the fuse with a new one and start the machine to prevent the fault from expanding.