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

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

Why such difficulties?

To turn on the power supply unit without a computer is simply necessary in case of its repair, because if you constantly turn off and 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 the computer wisdom says, if you could find a PC power supply, how to turn it on, it's easier to understand. 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 fastener). 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 adjacent, 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

Devices of the standard ATX can produce the following voltages: 3,3, 12 and 5 V. In addition, they have a good power (from 250 to 350 watts). But here's the question: "How to turn on the computer power supply?" Above we already, so to speak, in a few words set out the procedure, and now try to figure out more.

In earlier times it was easier

Curiously, the old blocks, which are related to the AT standard, could be launched 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 overlooked: do not make the power supply run idle. You can shorten his life in this way. Necessarily need to give a load. For this purpose, you can connect an old hard drive or a fan. As already mentioned, 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 to carefully study the pinout first. If your knowledge allows, you can make a special button to turn on the power supply.

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

First, let's check the presence of the primary power supply at the input of the power supply unit ~ 220V. Among the reasons for the absence can be called a malfunction of the power 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 case of primary power supply, even if the 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 the event that it is active, there is both an attendant 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 pins that are 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. A short circuit that occurs at the output of the PSU. Try to disconnect all devices from power, and remove all adapters temporarily from the slots. In addition, you must disconnect 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.