Turn on the power supply without the PC. How to turn on the power supply without a computer (jumper). Visual inspection of the power supply

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 we are talking about checking the performance of cathode lamps or new coolers.

Why such difficulties?

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

First launch

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 (a 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 about the fourth contact from the left (you need to count from the fastening latch). Most often, the contact we need is green. You should try to connect this wire to ground (i.e. any black wire). 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 the question is: “How to enable computer unit food? Above, we have already, so to speak, outlined the procedure in a nutshell, and now let’s try to understand it in more detail.

It was easier in the old days

Interestingly, older units that are AT standard could be run directly. With the ATX standard, everything is much more complicated. However, the solution to a huge problem comes down to a small wire 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 the wires going to the motherboard, hard drives, drives and other components. Better yet, remove the element we need from system unit and work away from him.

Another important point that should not be overlooked: do not let the power supply run idle. This way you can shorten his life. You definitely need to give it a workout. 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 do it special button to turn on the power supply.

Strange computer power problems: PC stops turning on

First, let's check the presence of a primary power supply of ~220V at the input of the power supply. Among the reasons for the absence are a malfunction of the surge protector, socket, plug, or cable break. The problem may also lie at the source. On the back of many units there is a power switch - this may 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 power supply output (if everything is working properly). This can be checked by testing the contacts of the power supply connector with a tester. We are interested in pin 9, which has a purple wire (+5VSB).

Often the motherboard has an LED indicating standby voltage. If it is active, both standby and primary nutrition are present.

If the computer still does not turn on, we look for other sources of the problem. We will look at the most common reasons below.

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

2. Short circuit that occurs at the output of the power supply. Try disconnecting all devices from power and temporarily removing all adapters from their slots. In addition, you should disconnect all USB devices. You can also deactivate the 4-8-pin power connector for the processor Power Connector +12V.

3. Malfunction motherboard or BP. If only the motherboard is connected to the power supply, but it does not turn on, it is likely that the unit itself is faulty. As for the malfunction of the motherboard, which makes it impossible to turn on the computer's power supply, we note that this is theoretically possible, but in practice it is extremely rare. To check this, turn on without connecting the connector to your motherboard. If the power supply turns on, it is the motherboard that is faulty.

Hello readers of this blog.

Now we will talk about how to start a computer power supply without a system unit. This is perhaps its only component device that can be turned on separately, and it is not necessary to have special skills.

Think you won't need this? Don't rush to conclusions. Read the article and you will learn about the benefits that even an old one can bring and why it is launched independently from the rest of the hardware.

Why turn on the power supply without a computer?

There may be several reasons:

• Is your computer not working? There may be a problem with the power supply. Check this version yourself before taking your PC in for repair.

• The hardware turns on, but there are failures? Monitor the voltage output from the unit under load.

• Do you constantly hear noise from the system unit? Check the noise level of the cooler by turning it on together with the power unit separately.

• A working power supply unit lying idle from an old computer can be given a second life. It is a strong and versatile device with different voltages.

And you get double the power (increased wattage). This is especially true for gamers or those who are planning to install additional cooling devices or neon lighting.
Or you can power other devices from the power unit, for example, if their native adapters are broken.

What are we dealing with?

The power supply converts the mains voltage to the value required by your hardware, stabilizes it from interference and provides energy to all other components of the computer.

Previously, these devices were produced in the AT standard, which could be launched directly, without any special manipulations. But modern units are presented in a more advanced standard - ATX. They have several “pigtails” of wires with SATA and Molex connectors to connect hard drives and a video card, 4-pin or 8-pin power supply for the processor, and 24-pin (20-pin in some models) for the motherboard with which they work together.

But don't let this complex design scare you. It is possible to start a power unit without a motherboard, and it is easy to do.

Algorithm of actions

Before you begin, of course, your device needs to be removed from the system unit. Turning on the power supply autonomously requires the following actions:

• Prepare a regular paper clip to short the wires.
• Regardless of the pinout of your power supply, find the green wire, it is called PS_ON.
• Now select any black wire.
• Insert one end of the paperclip into the first "outlet" and the other end into the second.

That's the whole process. Now you can run the power unit separately.

That’s basically all, with this trick your power supply will start without load.

Also, if you are going to power, for example, a car radio from the power supply, then for this you will need a yellow wire, under which a voltage of 12 Volts is supplied. “Bite off” it and any black contact from the connector and connect it to the power wires of the radio.

I have no doubt that you will succeed ;).

Hello, dear blog readers. I bring to your attention an article on the topic “ Turn on the power supply without the motherboard”. Breakdowns that occur during computer operation require elimination. If the computer does not start after pressing the power button, the likely cause of the malfunction may be a faulty motherboard or power supply. It would be impractical to buy both components; initially you need to check which part has failed.

In this article you will learn how check the functionality of the power supply.

There are several other reasons why you need to make starting the power supply without a computer, namely in the case of using two power supplies in one case, if it is necessary to check the functionality of new circuits and, of course, starting the power supply to check its serviceability.

Fig 1. Power supply.

A computer power supply is a secondary power source that supplies computer nodes uninterruptible power supply and converts the mains voltage to the specified value. In a way, using a power supply stabilizes and protects your computer from minor power outages. And the fan of this device, which starts working after turning on the power supply, is part of the cooling system of the internal parts of the system unit.

Button turning on POWER on the computer is connected to the motherboard, which is powered by the power supply. And it would seem that it is impossible to turn on the power supply outside of this circuit (since the power supply does not start without a load). But that's not true.

Turns out, run power supply without motherboard does not present any great difficulties. This is easy to do if you have a computer at hand on which you can run the power supply, a paper clip and tweezers and follow these instructions:

1. Any operation involving disconnecting and connecting wires and connectors must be carried out with the computer turned off and disconnected network cable And with the lid removed system unit. Do not forget about safety measures, since some installation elements will be energized.

2. Disconnect all connectors that connect the power supply to motherboard and other devices. Since the power supply can only be started under load, it is necessary to leave one of the devices connected ( hard drive or DVD/CD drive). The picture shows main power supply connectors

Fig 2. Power supply connectors.

Where:

1 – connector for connecting a floppy drive. Turn it off.

2 – ATA( IDE)-connector. Connects power to the ATA hard drive or drive optical disks. We leave one connector connected to the connector on the hard drive or drive (DVD/CD).

3 – SATA connector. Connects power to the S ATA hard drive. Turn it off.

4 – ATX 12V connector (connects power to the processor). Turn it off.

5 – connector (main 8-pin and additional 6-pin) power supply for PCI-E cards. Turn it off.

6 – 24-pin ATX connector (connects power to the motherboard). Turn it off.

7 – if there are other connectors, we also disconnect them.

To start the power supply we need 24-pin connectorATX(see picture).

Figure 3. 24-pin connector pinsATX

3. The connector that connected the motherboard and the power supply is equipped with pins PS-ON and GND. Where is the PS-ON pin - turn on, it is the 16th pin of the connector, on which the wire is most often green (less often this wire is gray, because Chinese manufacturers the English words green and gray are confused). And GND is ground, this is the fifth wire in the connector, which is always black. In order to make sure that the wires were chosen correctly and starting the power supply will not damage the power supply itself, you need to look at the inscriptions that are on the power supply board near the points where the wires are soldered. You can turn on the power supply by connecting the PS-ON and GND wires and applying voltage to the power supply.

4. In order to starting the power supply occurred immediately after power was applied to it, the PS-ON and GND wires must remain connected. But it’s better if there is a switch between these wires and when you turn on the power supply, you yourself will control the power supply.

5. In the case when it is necessary to use the power supply for long-term operation, and not for testing purposes, you need to take into account the fact that the power indicated on the power supply is peak. If you need to turn on the power supply for the purpose of its long-term operation, then you need to use average power.

Hello readers of this blog.

Now we will talk about how to start a computer power supply without a system unit. This is perhaps its only component device that can be turned on separately, and it is not necessary to have special skills.

Think you won't need this? Don't rush to conclusions. Read the article and you will learn about the benefits that even an old one can bring and why it is launched independently from the rest of the hardware.

Why turn on the power supply without a computer?

There may be several reasons:

• Is your computer not working? There may be a problem with the power supply. Check this version yourself before taking your PC in for repair.

• The hardware turns on, but there are failures? Monitor the voltage output from the unit under load.

• Do you constantly hear noise from the system unit? Check the noise level of the cooler by turning it on together with the power unit separately.

• A working power supply unit lying idle from an old computer can be given a second life. It is a strong and versatile device with different voltages.

And you get double the power (increased wattage). This is especially true for gamers or those who are planning to install additional cooling devices or neon lighting.
Or you can power other devices from the power unit, for example, if their native adapters are broken.

What are we dealing with?

The power supply converts the mains voltage to the value required by your hardware, stabilizes it from interference and provides energy to all other components of the computer.

Previously, these devices were produced in the AT standard, which could be launched directly, without any special manipulations. But modern units are presented in a more advanced standard - ATX. They have several “pigtails” of wires with SATA and Molex connectors to connect hard drives and a video card, 4-pin or 8-pin power supply for the processor, and 24-pin (in some models 20-pin) for the motherboard with which work together.

But don't let this complex design scare you. It is possible to start a power unit without a motherboard, and it is easy to do.

Algorithm of actions

Before you begin, of course, your device needs to be removed from the system unit. Turning on the power supply autonomously requires the following actions:

• Prepare a regular paper clip to short the wires.
• Regardless of the pinout of your power supply, find the green wire, it is called PS_ON.
• Now select any black wire.
• Insert one end of the paperclip into the first "outlet" and the other end into the second.

That's the whole process. Now you can run the power unit separately.

That’s basically all, with this trick your power supply will start without load.

Also, if you are going to power, for example, a car radio from the power supply, then for this you will need a yellow wire, under which a voltage of 12 Volts is supplied. “Bite off” it and any black contact from the connector and connect it to the power wires of the radio.

I have no doubt that you will succeed ;).

If you need to check the functionality of the power supply, but you don’t have a PC at hand, there is a simple way to carry out this manipulation. You only need a piece of wire. How to turn on the power supply without a computer? Let's answer this question.

We turn on the power supply without third-party components

Now all power supplies are ATX standard. They are not intended to be turned on without other components, since they are waiting for a start signal from the motherboard, but such an operation can be carried out.

To do this you need:

• First, take a small piece of wire and strip the ends.

• Then we pay attention to the power supply connector. The essence of our manipulation is to close the PS-ON and GND pins. These are the green and black wires, the first is number 14 on the twenty-pin connector, and the second is always located nearby. You can also pay attention to color coding, but the Chinese sometimes confuse the wires, so it’s better to clarify the pinout.

• Now we close these contacts with a pre-prepared wire, connect the power supply to the network and turn it on. The power supply will start, the cooler will start working. There are systems with load regulation, then the fan will not spin without connected devices. In this case, attach optical drive, this will help ensure that the device is in working order.

Useful information

If you need longer startup times, take two pieces of wire, strip them, and solder them to a power switch you previously purchased or removed from your PSU. Connect the remaining free ends of the wires to the previously designated connector contacts. Now the power supply can be turned on by pressing a key.

What if it doesn't turn on?

If the computer refuses to work, you need to check the presence of power at the power supply input. If it is there, even when the computer is turned off there will be a voltage of +5V. This can be easily checked by armed with a multimeter and checking the ninth pin (purple wire). If it is not there, then there are technical problems. There are many of them - from cable breaks to short circuit at the exit, with such a problem it is better to go to the service center.