How to close the power supply. How to start a computer power supply without a system unit and without additional devices? How can I use the power supply from the computer

Many computer enthusiasts have a question: “How to turn on the power supply without a computer?” This need is due to various reasons, most often we are talking about checking the performance of cathode lamps or new coolers.

Why such difficulties?

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

First start

As computer wisdom says, if you can find a PC power supply, how to turn it on is even easier to understand. All modern computer units comply with ATX (special international standard). Thus, the 20-pin connector has a contact that is responsible for the active state of any such unit. We are talking about the fourth contact from the left (you need to count from the fastening latch). Most often, the contact we need is green. This wire must be tried to close with the ground (i.e., any black one). It is most convenient to use the adjacent, 3rd contact. If everything is done correctly, the power supply will instantly come to life and the cooler will make noise.

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

ATX standard devices can output the following voltages: 3.3, 12 and 5 V. In addition, they have good power (from 250 to 350 W). But here's the question: "How to turn on the computer power supply?" Above, we have already, so to speak, outlined the procedure in a nutshell, and now we will try to figure it out in more detail.

It was easier in the past

It is curious that the old blocks, which belong to the AT standard, could be launched directly. With the ATX standard, things are much more complicated. However, the solution to a huge problem comes down to a little wiring that needs to be connected in a certain way. We have already described how to turn on the power supply without a computer, but we ask you to disconnect all wires going to the motherboard, hard drives, drives and other components. Better yet, remove the element we need from the system unit and work away from it.

Another important point that should not be overlooked: do not force the power supply to idle. This way you can shorten his life. You need to put on a load. For this purpose, you can connect an old hard drive or fan. As already noted, you will need black and green contacts to start. However, remember that some manufacturers, for unknown reasons, refuse to follow the established color coding. In this case, it is advisable to first carefully study the pinout. If your knowledge allows, you can make a special button to turn on the power supply.

Strange computer power problems: PC stopped turning on

First, let's check the presence of a primary power supply ~ 220V at the PSU input. Among the reasons for the absence can be called a malfunction of the surge protector, sockets, plugs, cable breakage. Also, the problem may lie at the source. On the back of many units there is a power switch - it can also be faulty or turned off.

In the case of primary power supply, even if the computer is turned off, there is a voltage of + 5V at the PSU output (if everything is in order). This can be checked by testing the pins of the PSU connector with a tester. We are interested in pin 9, which has a purple wire (+ 5VSB).

Often the motherboard has an LED to indicate standby voltage. If it is active, both standby and primary power are present.

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

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

2. A short circuit that occurs at the output of the PSU. Try turning off the power to all devices, and remove all adapters from the slots for a while. In addition, all USB devices should be disabled. You can also deactivate the 4-8-pin power connector for the Power Connector + 12V processor.

3. Malfunction of the motherboard or PSU. If only the motherboard is connected to the power supply, 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 supply of the computer, we note that theoretically this is possible, but in practice it is extremely rare. To check this, turn it on without connecting the connector to your motherboard. If the PSU turns on, it is the motherboard that is faulty.

Probably, many active users of modern and not very computers at least once during the period of use carried out an upgrade of their high-tech friend, that is, the replacement of individual components with more modern and powerful solutions. Very often, PC parts that have been replaced lie idle in pantries and garages. At the same time, many of them can still serve their owner as, albeit not quite standard, but at the same time quite functional assistants in various matters.

Below we will talk about the computer power supply. This important component of any system unit can be used not only for supplying power to computer systems, but also for other purposes. You only need to figure out how to run the power supply without a motherboard.

BP application

In fact, the power supplies used in computers are quite universal solutions, which are essentially voltage converters. Turning on a PSU without a motherboard makes it possible to obtain various voltages of electric current at its outputs, applicable to provide power to a wide variety of devices and devices. The PC component under consideration is a fairly reliable and powerful switching power supply that provides stabilized voltages at its output, and, importantly, is equipped with short circuit protection. Before proceeding to the instructions on how to start the power supply without a motherboard, let's look at specific examples of why this procedure may be needed.

LEDs

Today, LED strips are widely used as a source of light or decorative lighting, including in ordinary apartments. One of the voltages at the output of a computer PSU is 12V. This is exactly the indicator that the LED strip requires. You only need to do a few manipulations with the PSU, connect a tape to it, and economical lighting is ready!

Low power appliances

You can apply the knowledge of how to start a power supply without a motherboard in providing power to various motors, fans, light bulbs, etc. After starting the PSU, we get three different voltages - 12V, 5V and 3.3V. This list is usually enough to feed the above. More powerful devices can also be powered, such as a car stereo or a sound amplifier for passive speaker systems. The main thing is not to exceed the permissible load.

Instruction

So, how can you run a power supply without a motherboard. In fact, everything is very simple. In order for the power supply to automatically start when voltage is applied, it is necessary to close contacts No. 14 (POWER ON) and GND located on the block that is connected to the PC motherboard, and then apply voltage to the power supply itself. In most cases, the contacts needed for closing are the ends of the green and black wires. To close, use any metal object at hand - a piece of wire, a paper clip, etc.

A warning

Before starting the power supply without a motherboard, the user must make sure that there is a load on it. That is, a device must be connected to the PSU (red and black wires). Turning on the unit "idle" is highly undesirable and can lead to the failure of the power supply unit. The load can be a regular light bulb with a power of about 10 W, a resistor, a regular PC case fan, etc.

In such a simple way, you can breathe life into a seemingly unnecessary and inapplicable device. The launch method itself, as we see, is not at all complicated, the main thing is to set the ultimate goal for yourself, to do everything carefully and carefully.

The ability to start a power supply without a computer and motherboard can be useful not only for system managers, but also for ordinary users. When there are problems with the PC, the main thing is to check the performance of its individual parts. Any person can cope with this task. How to turn on BP?

How to turn on the power supply without a computer (without a motherboard)

Previously, there were power supplies (abbreviated as PSU) of the AT standard, which were launched directly. With modern ATX devices, such a focus will not work. This will require a small wire or an ordinary paper clip in order to close the contacts on the plug.

Modern computers use the ATX standard. There are two types of connectors for it. 1st, older, has 20 pins on the plug, 2nd - 24. In order to start the power supply, you need to know which contacts to close. Most often, this is the green PS_ON pin and the black ground pin.

Note! In some "Chinese" versions of the PSU, the colors of the wires are mixed up, therefore it is better to familiarize yourself with the pinout (pinout) before starting work.

Step-by-step instruction
So, when you are familiar with the wiring diagram, you are allowed to start launching.

1. If the power supply is in the system unit, disconnect all wires and pull it out.

2. Old 20-pin power supplies are very sensitive, and in no case can they be started without load. To do this, you need to connect an obscene (but working) hard drive, cooler or a primitive garland. The main thing is that the PSU does not idle, otherwise its service life will be greatly reduced.

Connect something to the power supply to create a load, say, a cooler

3. Take a close look at the pinout and compare it with your plug. It is necessary to close PS_ON and COM. Since there are several, choose the most comfortable for you.

Observantly compare the location of the contacts on your plug and on the diagram

4. Make a jumper. It can be a short wire with bare ends or a paper clip.

5. Close the selected contacts.

Close PS_ON and COM pins

6.Turn on the power supply.
The fan is noisy - the power supply is working.

Checking the performance of the power supply is a simple task that an ordinary PC user can handle. Just follow the instructions carefully.

The case of the system unit is an important component of the entire computer. It is in the case that the “production shop” of the entire computer is located, so to speak. It is in the case that the motherboard is installed, and the RAM, video card, processor and all kinds of wires and cables are already “hung” on it. Moreover, the power supply is located in a separate place inside the case, however, as well as the hard drive and drive.

Modern cases look quite attractive, menacing, aggressive, unusual ... The developers have enough imagination, which means that ordinary buyers can choose from a huge assortment. But not only do the current cases have an attractive appearance, they also have "working" pluses. Such pluses are USB connectors, as well as microphone and headphone jacks on the front of the case, which in turn means that every time we need to connect a USB flash drive, we need to climb under the table and get to the back of the case. I think everyone agrees that these are, in principle, trifles, but still, it’s more pleasant to just insert a USB flash drive in front and start working.

But, unfortunately, there are cases when some parts of the computer case fail. It's about the famous POWER button, which is absolutely on every case. In the process of long operation, this button can simply fail, for example, stop being pressed, or vice versa, it will fall deep into the case, and no matter how you “conjure”, you won’t be able to turn on the computer. What to do in such situations? If you don’t really need a computer, then it’s better to call the master and wait with peace of mind until he repairs everything, paying him a certain amount of money for this.

If you need to use the computer urgently enough, then perhaps you should use the following advice.

First you need to find a flat surface and carefully place the system unit so that the left cover looks at you, while you should not disconnect all the wires in order to complete everything faster, but you should make sure that these wires are not stretched. In addition, a prerequisite should be that the computer is disconnected from the power supply, as they say, you never know. The next thing to do is remove the left case cover. In modern cases, this usually does not require any great effort, so this should not be a problem.

After removing the cover, an amazing picture will appear in front of you. You will see everything for which you once gave a round sum, and which usually works peacefully, making an innocent noise, and what now does not want to “start up”. Our focus should be primarily on the multi-colored wires that run from the front of the case to the motherboard. There can be many such wires, and it is not surprising, because there are connected and POWER buttons and RESET button, and USB ports, together as audio outputs. So, at the next step, we may need a little knowledge of English, which many received at school, because on the wiring itself, as well as on the motherboard, near the connection of these wiring, it should be written what they mean. Take the USB ports as an example. On the motherboard itself, near the connection, there should be an inscription USB1, USB2, etc. This means that the wires connected to these connectors are nothing but USB connection ports.

But do not forget about our problem, which means that we need to look for posting POWER(usually these are two wires woven together). Typically, the connectors to which the power or reset buttons are connected are located on the lower right side of the motherboard:

On most motherboards, these connectors are the same and consist of 9 pins arranged in two rows. The last two contacts in a short row of 4 plugs are responsible for turning on / off the computer.

Here are the connector diagrams for the most popular motherboard manufacturers.

MSI

AsRock

Asus

Biostar

Epox

foxconn

gigabyte

Intel

When these two wires are found, you should find where they are connected to the motherboard. After the connection point has been found, it is worth carefully disconnecting these wires, so that the small plugs are exposed.

That's it, now we're almost done. The final step is only turning on the computer, for this we need an ordinary stationery pen, preferably one that writes in bold. After finding such a pen, you can connect the computer to the power supply, and then gently run the tip of the rod over these bare needles. Or in other words, you just need to close these contacts. After these steps, the computer should come to life, and the download will begin. If nothing happened, then it is worth repeating the procedure, but close these needles quickly enough.

Thanks to such simple steps, you can start the computer without any problems, but this should not be neglected, and it is better to fix the start button on the case as soon as possible in order to avoid unnecessary problems.

Attention: Neither the author of this article, nor the administration of this site, bears any responsibility for possible problems that may arise in the process of turning on the computer in this way. You will perform all of the above actions at your own peril and risk, and will be solely responsible for possible problems that are not described in this article.

For many fairly experienced personal computer users, it is no secret that any power supply without a motherboard by connecting certain contacts on the main 20/24 pin chip.

Such a need may arise when you need to check the performance of the unit, in which the system unit does not respond to pressing the power button. After all, he is the first suspect in such cases.

In this article, we will tell you which wires you need to close in order for the computer power supply to start.

What contacts to close to start the power supply?

If you need to find out the health of the block, then the best way to do this is to force it to start. Despite the fact that in cases where there is no reaction to pressing the power button of the system unit, the power button and even the motherboard can be the culprits.

So, to begin with, we completely de-energize the block. That is, we pull out the wire going to the outlet. After that, take a piece of wire or a paper clip.

Green wire - starting. It must be closed with any black.

This is how it looks on the diagram:

Pinout of the 20-pin power supply connector

After the contacts are closed, you can insert the power cable into the outlet. Please note that if there is a button on the back wall, it must also be enabled.