Poor power supply, endless harm

When buying a computer, you are too concerned about the speed of the CPU, the memory capacity, the speed, and the hard disk capacity and speed, this is also the most transparent, and the majority of businesses are most willing to publicize and boast to use. However, we all ignore a very important issue. The power supply of the PC is the foundation for other components to work normally and stably for a long time. If you don't have a good power supply, your computer will be more advanced, and the speed will be faster, it will inevitably cause conflicts for you in three days. The following is the troubleshooting process of a computer fault. once you see it, you will know that poor-quality power supply is really harmful.

Example: a diy compatible machine, with the following configurations: PIV1.6GCPU, 80stst7200 hard drive, 8IRX533 motherboard, and rmos 256mddr333 memory

Fault description: The machine can be started normally, but sometimes the hard disk cannot be found during startup, or even the hard disk will be suddenly lost when the computer is in use. This is because the fault is not obvious, and the customer did not care about it, but the crash became more and more frequent, and finally the computer was unavailable, so the customer took the computer to the Company and asked for repair.

Troubleshooting:

1. Because at first no one thought it would be a power supply problem, they should be removed one by one based on the principle of first soft, then hard, and minimum system. Because it is an irregular crash, the first suspect is a software problem, reinstall the system, but there is still a crash in the Operation detection.

2. After removing software faults, consider hardware issues. First, the minimum system method is used to remove the optical drive, soft drive, modem, Nic, and so on. Only the basic hardware such as the video card, memory, CPU, and motherboard are retained for running testing.

3. At this time, the faulty parts may be the CPU or motherboard, and the memory. Therefore, after separately testing the CPU, motherboard, and memory, we found that there was a problem with the motherboard. Even if other power sources, CPUs, and memory were used, there was still a crash and hard disks could not be found. It can be basically determined that there is a problem with the IDE interface of the motherboard and the hard disk cannot be identified.

4. We thought that the fault had ended. We replaced the new motherboard of the same model and installed it. However, after power-on, the hard disk still cannot be found, and the problem is serious. This machine does not have only one component. The hard disk still cannot be found, but it is certain that the new motherboard is correct. After the power supply is started, use a multimeter to test the output of the switch power supply. The voltage of + 12 V is only 9.98 V, and that of + 5 V is only 4.4 V, + The voltage of 3.3V is only 2.68 V, which is much lower than the standard voltage. No wonder such power supply will always crash.

5. Replace the new power supply. After the system is installed, power up the test machine and install the Operating System. Everything is normal and the fault is completely eliminated.

Fault summary:

In fact, the most fundamental cause of this fault is the failure of the power supply that causes damage to the motherboard and frequent crashes. However, because the surface of the dead machine masks the actual power supply failure, it takes a lot of time during the repair process. It should also be noted that the hard disk of this machine has not been replaced by the new motherboard and power supply for half a month, and there is a large area of bad sectors on the hard disk. In the end, it only has to be repaired at the factory.

At this point, we should also understand that although the value of power supply does not take up much of the entire computer, we don't need to say much about its importance. In this case, a unqualified power supply caused damage to the motherboard, damaged the hard disk, and wasted several days of service time.

After reading the above article, we should also understand that when purchasing compatible hosts, do not save money on power, or else it will be worth the candle in the future.