How to run the power supply separately from the computer. How to turn on the power supply without a computer (jumper)

Hello readers of this blog.

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

Think you won't need it? Do not rush to draw conclusions. Read the article and you will learn about the benefits even the old one can bring and why it is launched autonomously from the rest of the hardware.

Why turn on the PSU without a computer?

There may be several reasons:

• Your computer is not working? Perhaps the problem is in the power supply. Check out this version yourself before taking your PC in for repair.

• Iron turns on, but there are failures? Track the voltage output by 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.

• An idle working PSU from an old computer can be given a second life. It is a strong and versatile device with various voltages.

And you get double the power (increased wattage). This is especially true for gamers or those looking to install additional cooling devices or neon lights.
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 that your hardware requires, 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 blocks are presented in a more advanced standard - ATX. They have several "pigtails" of wires with SATA and Molex connectors to connect hard disks and a video card, 4-pin or 8-pin power for the processor, and 24-pin (20-pin on some models) for the motherboard that they work with.

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

Action algorithm

Before starting, naturally, your device must be pulled out of the system unit. Turning on the PSU autonomously requires the following steps:

• Prepare a regular paper clip to short out the wires.
• Regardless of the pinout in your power supply, find the green wire, it is called PS_ON.
• Now select any black posting.
• 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 it, your power supply with this trick will start up without load.

Also, if you are going to power, for example, a car radio from a power supply unit, 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;).

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 know the performance of the block, then The best way do it - it forced 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.

The need to supply power to the adapter for connecting hard external drive through the USB socket to a personal computer made me remember the JNC LC-200A power supply that had long been gathering dust on the mezzanines. There is a voltage of 12 and 5 volts, there is enough current. What can I say - a profile power supply in such situations is always the best option.

He fulfilled his function successfully. I decided not to look for another power source for these purposes, but the abundance of wires coming out of it confuses me. And there is only one way out, since I decided to use it constantly - refinement is needed.

I disassembled the power supply into separate nodes, painted the case, drilled holes in the lower part for the terminals and installed rubber feet on the bottom (which I put in the first place, otherwise you’ll assemble the whole table with the iron of the bottom).

I put the terminals on all types of available voltages, let them be. Red "+12", "+5", "+3.3" volts, and black "0", "-12", "-5". Moreover, using their various combinations, you can get a very wide range of constant output voltages.

Got paid. The wires going to the fan were previously simply soldered - I installed a connector in case it was necessary to disassemble the power supply in the future.

Of the output wires, he left two bundles intact, shortened and combined the rest (in accordance with the color and, of course, the output voltage).

The board was in place, shortened wires to the terminals, solid harnesses brought out.

screwed upper part case in place, on one output harness left the power connector for connecting hard drives with an IDE interface, on the other installed a connector for drives with a SATA interface. I signed the power terminals in the simplest and most accessible way - I printed out the necessary designations, pasted tape on top of the text, cut it out and pasted it.

back side assembled block nutrition. The power button is located in a convenient niche, accidentally turning it on or off is almost impossible. And this is not a trifle, since in the event of an unauthorized disconnection of power from the connected to computer hard external drive may have adverse effects. It is incomparably more convenient to use the modified power supply for connecting the liquid-heater, I would say even comfortable. Plus, the ability to use the power supply and to obtain a wide variety of other constant voltages.

Getting different voltages - connection table

We get	Connecting
24.0V	12V and -12V
17.0V	12V and -5V
15.3V	3.3V and -12V
10.0V	5V and -5V
8.7V	12V and 3.3V
8.3V	3.3V and -5V
7.0V	12V and 5V
1.7V	5V and 3.3V

Also, the PSU has become more compact and mobile, so it will have a lot of applications - the need for a powerful and separate source of various voltages often arises. Project author - Babay from Barnaula.

In some situations, it is required to start the power supply without using personal computer(PC). First of all, this is necessary to check the performance of the component and the voltage at the terminals. Next, we will consider in detail the principle of operation and start-up of the power supply without using a computer.

Important! Before starting the process, it is worth saying right away that starting the power supply unit (PSU) without using a PC or other load (at least a connected light bulb or cooler) can lead to its breakdown and damage. electric shock, therefore, all actions are performed at your own peril and risk.

A little about why this is needed

Reasons why you may need to start the PSU without using a PC:

• computer won't start or a few seconds after the start turns off. In this case, you need to check the PSU for the presence of output voltage;
• diagnostics PC components;
• usage multiple devices in one computer, to increase productivity.

Standard turn-on procedure

The principle of operation of the power supply is based on electricity conversion(mains voltage) to the value required for the functioning of the PC. Thanks to this, computer components can work stably and not be affected by various interferences.

The startup process is as follows:

• first of all current fed into the filter, which is responsible for peaks, harmonics and interference in the electrical network;
• further by passing through the filter, current stabilizes. Take for example a power value of 350V;
• then current fed into the inverter, where is converted to variable value from 30 kHz to 55 kHz. In conclusion, the current is supplied to all PC components through different taps, because. equipment requires different voltages.

How to turn on the power supply without a computer

The first power supplies for PCs were manufactured according to the AT standard. Thanks to this, the launch could be done without using a PC, i. directly. Now blocks are produced in the new ATX standard, and idle start now harms them. They are equipped with SATA and Molex connectors for connection of rigid disks and video cards. There are also 4-pin and 8-pin power for connecting the processor and 20 pin (older devices) or 24 pin (equipped with modern PCs) for the motherboard.

To start the PSU, you need to know which contacts you need to close, as a rule, for this use the PS_ON connector(green) and COM(black). Next, we'll take a step-by-step look at the general steps to launch without a PC.

First of all, you need to understand which cables carry which voltage in order to protect yourself. Power supply pinout diagram:

Color	Voltage level in Volts	Connector number	Connector number	Voltage level in Volts	Color
orange	+3,3	1	13	+3,3	orange
orange	+3,3	2	14	-12	blue
black	grounding	3	15	grounding	black
red	+5	4	16	Power on	green
black	grounding	5	17	grounding	black
red	+5	6	18	grounding	black
black	grounding	7	19	grounding	black
grey	power good	8	20	-5	white
violet	+5 VSB	9	21	+5	red
yellow	+12	10	22	+5	red
yellow	+12	11	23	+5	red
orange	+3,3	12	24	grounding	black

Instruction:

• to start you need perform a shutdown PSU from the network and other PC components;
• then we unscrew the fastening bolts and carefully pull out the power source from the system unit;

note that units equipped with 20 pin and 20+4 pin connectors should not be switched on without load. IN otherwise it may fail.

Regarding the old power supply standardAT- everything is a little different there. Shorting the green and black contacts will not turn on the power supply without the motherboard. In this case, it is necessary to make 2 jumpers and use them to start immediately two combinations: blue - black and white - brown.

ATTENTION! When starting a PSU of the AT standard, you should be careful! The voltage on one of the closing contacts is 220 volts!

How can I use the power supply from the computer

From an unnecessary PSU, it is quite possible to make devices that are useful in everyday life. Next, consider how you can use the block from the computer.

Converting the PSU to a variable voltage source

Source constant voltage from a computer power supply is quite a convenient thing. To do this, you need to run replacement of resistance coils and unsolder the throttle. Thanks to this, the voltage can be adjusted from 0 to 20V. If a standard voltage (12V) is required, then a thyristor regulator must be installed.

PSU conversion to charger

To convert the power supply to Charger will need to be done Schottky diode replacement to ultra-fast. The main advantage of such a memory is that it has a small weight and dimensions. disadvantages this device is sensitive to overloads and short circuits. To eliminate overloads and short circuits, it is required to make a protection system.

Converting the PSU to a constant voltage source

First you need to determine what type the PSU belongs to - AT or ATX. Pulse (AT) operate exclusively under load, in turn, ATX is enough to close with load simulation, as described in the instructions above. In this case, the output will be a voltage of 5 to 12 V. The final values ​​\u200b\u200bwill depend solely on the initial power of the block.

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?

It is simply necessary to turn on the power supply without a computer 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 could find a PC power supply, how to turn it on is even easier to understand. All modern computer blocks 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 enable computer block nutrition?" 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 please disconnect all wires going to motherboard, hard drives, drives and other accessories. 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.