Failure Analysis of Computer Backplane Burning Down

Abstract

The bottom plate burned out during the computer power-on detection process. This was analyzed. Firstly, the fault tree of the bottom plate was built and analyzed. Then a fault tree is established for the problem of capacitor short-circuit failure, and finally the possibility of capacitor problem is eliminated. After analysis, it is concluded that the cause of the burning of the bottom plate is the presence of foreign objects in the chassis. In the process of random vibration, foreign objects may be short-circuited to the power supply, resulting in a short circuit of the bottom plate, which may cause burnout. The power supply has an overcurrent protection mechanism, but the protection mechanism is that the power supply reduces the voltage output in the event of an overcurrent, so even if a short circuit occurs, the power supply will still output current, resulting in a burnout failure.