Advice 1: How to check power supply performance

If the computer does not turn on, the cause may be a burned-out block power. Of course, do not just go to the store and buy a new one. First, it is necessary to check the efficiency of the power supply. Perhaps the problem is not in it.
You will need
  • Work computer, clip, screwdriver, multimeter.
Instruction
1
Take another working computer. Carefully disconnect the wires from the power supply and remove it. Connect the power supply to check. And try to start the computer. If it does not turn on, recheck the proper connection of all wires and start again. If the computer does not turn on again, then your power supply is burned.
2
If you don't have another computer, remove the PSU and open it. Carefully inspect everything inside. If you see swollen capacitors, smelled or saw Gary spilled a sticky liquid on the motherboard, then your power supply is burned.
3
If the inside no damage is detected, it is necessary to try to run the power supply separate from the computer. A large part of the power supplies are equipped with load resistors (the exception may be some Chinese models), so the hot wire and test the power supply to be safe.
4
Put the PSU on the floor and check that under it there were no metal objects. Take the ribbon cable that connects to the motherboard, select the black and green wire. Lock usual a paper clip both wires. Instead of a paperclip you can use any metal object. If the power supply is switched on (earned cooler, turn on the led of the drive), so the problem is not in it. This is the easiest way to check power supply for proper operation.
5
Next, you will need to check the voltage on all outputs of the PSU. It is of 3 types - +3.3 V (orange), +5V (red and white), +12V (yellow and blue). Better before testing, connect the power supply small loads, such as automotive light bulb. Take a multimeter and connect it alternately to each output. Before checking all the connectors better purging to remove accumulated dust. Slight variations in voltage are permissible. If deviations are more than 0.5 V, then the problem is in this place.

Advice 2: How to check the functionality of the unit

Power supply – a component of the system unitthat supplies voltage to all the basic elements of a computer: motherboard, drives, hard drive, and so on. It is the standard input power at 220V, which is then distributed to circuits and electronics.
You will need
  • - power supply unit;
  • - voltmeter/multimeter.
Instruction
1
Do a quick check of the unit power supply without being connected to devices and equipment. Take it 20-pin connector, locate the green wire and jumper wire to any black. If the block began to spin the fan, generally means the power supply is operational. For more detailed check, use the following steps.
2
Look on the unit label, which provides information on allowable values, load currents on the channels, usually it is located on the side wall. Next, check the voltage on each of the channels with a multimeter to determine the efficiency of the unit, but rather, some of its elements. Information on "ideal" indicators and possible tolerances can be found on the official website of the manufacturer.
3
Plug the power supply in series with an ordinary incandescent lamp, to avoid "fireworks". Turn on the unit in the network measure relative to the common wire voltage at the ninth terminal of the connector of the motherboard. If all the readings correspond to the permitted values, connect the PSU directly. Turn on the unit. This lock 14 and 15, the socket of the motherboard.
4
"Load" the block to measure and evaluate the performance of BP. You must submit a load on it, at least half the maximum current. In the case of the 250W unit, it will be 11 amps. The load use powerful wire resistors, for example, sew.
5
But be careful, this load can become fatal for most of cheap blocks. Therefore, move the load to the lower limit value of the current. Consider also that the resistor power is dissipated. For the +12V power is approximately 20-25W. Choose load resistors of these considerations.
6
Connect the load and measure the indications to perform a health check BP, if the values of the stress correspond to parameters of the plate, the unit is suitable for use.
Note
If your PSU is still under warranty, do not open it yourself, otherwise the warranty will be invalid.
Useful advice
If you have not worked with the current, it is better not to measure and not to hot wire it independently, and to give power supply to the service center.
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