The computer power supply problems?
Power supply is an important part of computer, computer parts the hub of power supply, computer power source is 220 v ac, converted into direct current, and specifically for computer accessories such as CPU, motherboard, hard disk, memory, graphics card, cd-rom drive, power supply of the equipment.
When the power problem, often computer can not open the airport. Computer power supply fails more commonly has the following kinds: power output but startup without display, power supply output or output voltage instability, in the power load capacity is poor, blown fuse, etc.
According to the different types for everyone to introduce below the computer power supply the simple solution of this problem.
Computer power supply by filter commonly, protector, filter circuit, transformer, protection circuit, circuit parts, heat dissipation, and can be divided into two categories, ATX and BTX.
1, power output, but no display the boot.
Possible reasons for this problem is simple, is "Power - Good" signal delay, or "Power - Good" no output. Can be measured with voltmeter host power plug 1 foot, if there is a + 5 v output, the time delay of the replacement time delay circuit capacitance can; If no + 5 v output, check the delay components again.
2, power supply without losing or output voltage is not stable.
The causes of the problem may be the power load out of work, oscillating circuit, filter capacitor leakage in open circuit, power supply short circuit, over voltage, over current protection circuit malfunction, high-frequency rectifier diode is punctured in rectifier filter circuit, etc. Can use the multimeter to measure the system board + 5 v power supply to ground resistance, to determine whether a motherboard short-circuit; Otherwise the point of failure may appear in the control circuit.
3, the power load ability is poor
Possible reasons for rectifier diode is damaged, zener diode heat leakage, high pressure filter capacitance, the transistor leakage or damage to the working point not good choice. Can adjust the transistor set-point or change in the oscillation circuit of transistor, also can use the multimeter to detect defective parts after replaced.
4, blown fuse
First to figure out which part is fusing with the line, can turn it off, when the power is to view of circuit boards, and measured with the multimeter.
Finally, because a lot of people power holding can be dangerous, so can't laid hands on him, with power supply problems, often can cause the mainboard or system collapse, so sometimes we ignore, but it is easy to small dragged into a great misfortune, when not sure your computer problem, the best to send it to professional maintenance structure for maintenance.
