The computer power supply capacitance bulging caused the video card failure eventually led to black screen

Computer malfunction: Computer Configuration: abit 865PE motherboard, P4 2.4CCPU, two Kingston 256M DDR400 memory, Dylan constant into X700 video card, 250W power supply. In recent weeks, frequent video card failure, in the normal operation of a sudden black screen, and then the boot BIOS has a long two short sound alarm, indicating that the video card failure. Sometimes boot hard drive light, CPU fan turn, but the BIOS system card dead, no alarm no display. Always suspected that the temperature is too high, to strengthen the cooling is still frequent black screen, is the graphics card is almost finished?

Fault handling: Online read some other people's experience, the fault may be related to the power supply, but by measuring the power of each output voltage is normal, power is sufficient. Can turn on the power of a look, an output near the top of the capacitor has been significantly bulging, where 5V, 12V, 3.3V output filter capacitors are 2200uf/10v electrolytic capacitors. 5V end of the maximum current, so the highest intensity of work, it seems that the life of the capacitor ahead of time. In the switching power supply on the output capacitor is a special requirement, is generally required to work at a temperature of 105 degrees, low ESR, high ripple resistance. To the market to buy 10 parameters to meet the requirements of the 2200uf/16v Taiwan Teapo Electrolytic Capacitor, a total of 5 yuan. For safety, replace all four output capacitors. Power supply After careful examination of the test, loading machine normal work, there is no such fault.

Failure Analysis: X700 graphics card Special needs 5V auxiliary power supply, because the 5V end output capacitor quality seriously drop, in a certain run will not power supply, resulting in black screen can not start, and so on, this fault will become more and more aggravating with time. The normal amount of voltage is in line with the requirements. Fortunately, in time to find the scope of the fault to expand to the power supply, or really put the graphics card to repair, and then toss out some other problems, that just injustice?

Comments: power-changing capacitors need some hands-on ability and electronic knowledge, maintenance of the power must pass the off-line test to be installed in the computer.