Summary of computer power failure
A problem with power supply 5v output leads to physical damage to the hard drive, which can generally be repaired by software, and a problem with power supply should replace the same type of power of reliable and stable quality。
2. Increased noise from power fans affecting use. This may occur if computers are not used for long periods of time and there is too much dust accumulated on fans. The solution would be to unplug the computer, unload the power, remove the fan from the top, remove the dust carefully, and be able to get oiled. Then you reload it and the noise will be eliminated when it's on。
3. Poor optical disk performance. This generally occurs on newly purchased computers or cd-roms, which are read with a larger “humming” that removes optical malfunctions and is likely to have power problems, and should be unopened if necessary。
4. Excessive instability. Cpu ultra-frequency work is very demanding for power stability, and if the power is of poor quality, it is often abruptly dead or restarted while operating over the frequency. It's usually just a replacement of a stable power source。
5. Tattoo interference on display screen. It is likely that the electrical electromagnetic radiation leak from the power source interferes with the normal display of the monitor, which is likely to be magnetic if not processed for a long period。
The mainframe is frequently launched twice. Imperative power is insufficient to enable all computer-enabled equipment to function properly, resulting in system software error, loss of memory and failure to read and write hard disks and pvs, among other things, enabling the machine to restart。
Reasons for power failure and maintenance methods
1. Melting fuses. In general, the main reasons for the fuses' melting are the abnormality of flow filters and switch circuit elements, and the instability of municipal electricity. For example, in the case of pyrophoric diode piercing, damage to filter capacitor, damage to switches, etc. The inspection shall first examine whether the elements on the circuit board have been burned, e. G. The electrolyte spilled, etc。
2. Non-direct current voltage output or output voltage instability. If the fuse is complete, first the ground-to-ground resistance of the +5v panel is measured using a single-use gauge, which means that there is no short circuit on the circuit board if it is more than 0. 8 times; then the unnecessary hardware in the computer, such as hard drives, optical drives, etc., is temporarily removed, leaving only the main plate, the power, the beeper, and then the output end voltage is measured, and if the output is still 0v at this time, the power-control circuits are malfunctioned and should be carefully searched。
Power load capacity differential. In the case of power load differentials, only the main plate, soft-powered power, and when connected to the hard drive, the load capacity is insufficient, causing the screen to turn white and not working properly. Possible causes include damage to steady diodes, current diodes, filter caps, and abnormal transistor work points. If the transistor is normal at the working point, the transistor tubes in the oscillation circuit may be replaced or the transistor points may be readjusted。
4. Repeated burning of safety pipes. In the event of repeated failure of the power fuse, the fault area is most likely to be circuitd before the primary circuit of the transformer. This may be done by replacing the utility test. The failure in the noise filter circuit is demonstrated by the immediate bursting of the municipal electrical safety tube, which proves that the communication input circuit is short-circuited, that it can rotate normally through the whole stream of the source fans and that the direct current output voltage is tested。
