For those who love experiments: how to turn on the power supply without a computer?

Many computer enthusiaststhe question: "How to turn on the power supply without a computer?" Such a need is caused by various reasons, most often it is a question of checking the efficiency of cathode lamps or new coolers.

Why such difficulties?

Turn on the power supply without a computer justit is necessary in case of its repair, because if you constantly turn off and turn on the computer, this will negatively affect the PC components, due to premature failure of the batteries. In addition, any experiments with a computer can cause unstable operation of the operating system.

First start

As computer wisdom says, if you couldfind a PC power supply, how to turn it on - to understand and even easier. All modern computer units comply with the ATC (special international standard). Thus, the 20-pin connector has a contact that is responsible for the active state of any such unit. It's about the fourth to the left of the contact (you need to count from the fixing bracket). Most often the contact we need is green. This wire should be tried to close with the ground (ie, any black). It is most convenient to apply the next, 3rd contact. If everything is done right, the power supply will instantly come alive, and the cooler will noisy.

How to turn on the power supply without a computer: details

ATX devices can issue the followingVoltage: 3,3, 12 and 5 V. In addition, they have a good power (from 250 to 350 watts). But here is the question: "How to turn on the computer power supply?" Above we already, so to say, in a few words set out the procedure, and now try to understand more.

In earlier times it was easier

It is curious that the old blocks that relate tostandard AT, could be started directly. With the ATX standard, everything is much more complicated. However, solving a huge problem is reduced to a small wiring that needs to be connected in a certain way. How to turn on the power supply without a computer, we have already described, but we ask you to turn off all the wires going to the motherboard, hard disks, drives and other components. And even better - to remove the necessary element from the system unit and work away from it.

Another important point that should not be missedout of sight: do not make the power supply run dry. You can shorten his life in this way. Be sure to give the load. For this purpose, you can connect an old hard drive or fan. As already noted, black and green contacts will be needed to run. However, remember that some manufacturers for some unknown reason refuse to follow the established color marking. In this case, it is expedient first to carefully study the pinout. If your knowledge allows, you can make a special button to turn on the power supply.

Incomplete problems with the power of the computer: the PC stopped turning on

First, we check the presence of the input of the PSUprimary power supply ~ 220V. Among the reasons for the absence can be called a malfunction of the mains filter, sockets, plugs, cable breakage. Also, the problem can be found in an uninterruptible power supply. On the back of many units there is a power switch - it can also be defective or off.

In the case of primary feeding, even ifthe computer is turned off, the output of the PSU is + 5V (if all is correct). This can be checked by testing the contacts of the BP connector. We are interested in pin 9, which has a purple wire (+ 5VSB).

Often the motherboard has a LED indicating the standby voltage. In case if it is active, there is both a duty person and primary food.

If the computer still does not turn on, look for other sources of the problem. The most common reasons are discussed below.

1. Open circuit in the power button. To check this, short-circuit with tweezers the contacts responsible for turning on the power supply on your motherboard, or run the PSU outside the system unit (how to turn on the power supply without a computer, we described in detail above).

2. Short circuit that occurs at the output of the PSU. Try to disconnect all devices from power, and remove all adapters from time to time from the slots. In addition, you must turn off all USB devices. You can also deactivate the 4-8-pin power connector for the Power Connector + 12V processor.

3. Malfunction of the motherboard or power supply. If only the motherboard is connected to the power supply unit, but it does not turn on, it is probably the unit itself that is faulty. As for the malfunction of the motherboard, which leads to the impossibility of turning on the power of the computer, we note that theoretically this is possible, but in practice it is extremely rare. To check this, turn on the power supply without connecting the connector to your motherboard. If the power supply is turned on, the motherboard is faulty.