If there is a need to check the functionality of the power supply, and you don’t have a PC at hand, there is an easy 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.
Now all power supplies are ATX standard. They are not designed to be turned on without the rest of the components, as they are waiting for a start signal from the motherboard, but this operation can also be performed.
If you need longer runs, take two pieces of wire, strip them, and solder them to a pre-purchased or removed power switch from your PSU. Connect the remaining free ends of the wires to the connector pins already indicated earlier. Now the PSU can be turned on by pressing a key.
If the computer refuses to work, you need to check the presence of power at the PSU input. In the event that it is, even when the computer is turned off, there will be a voltage of + 5V. This is easy to check by arming yourself 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 a cable break to a short circuit at the output, with such a problem it is better to go to a service center.
Computer power supplies are powered by being connected to the motherboard. However, in some situations this is not possible. Sometimes users need to check the performance of an old or new PSU without using a computer, connect a second unit to a PC, or diagnose a problem. In today's article, you will learn how to turn on the power supply without a computer using a pin jumper.
To fully understand the issue, do not skip this video. It describes and shows all the actions from the instructions.
The repair and management of computer components must be approached as responsibly as possible. If you do not have experience in such procedures, then follow all the steps from our guide in strict sequence:
Modern personal computers use ATX type blocks. They connect to the motherboard using a 20- or 24-pin plug, depending on the specific model and manufacturer. The essence of the jumper of two contacts is to simulate the signal from the motherboard. As a result, the power supply will start without third-party equipment. The pin layouts and colors are shown below. To make it easier for the user to navigate, the figure shows the latch of the plug.
Now let's move on to the most important thing - the procedure for turning on the power supply. But before that, you need to understand in detail the device of the power plug and contacts. To close, connect the PS_ON contact, which is highlighted with a green cable, with a prepared wire to any black COM contact. It is more convenient to bridge PS_ON with an adjacent contact.
If the colors are mixed up on your power supply, then do not risk it and be guided by the location of the necessary wires. If the latch of the plug is considered the top part, then PS_ON is located in the top row, fourth from the left. The fifth is the black COM, which is connected by wiring.
If you want to run an old AT standard power supply, then this circuit will not work. You need to use two jumpers at the same time. One connects the blue and one of the black pins, and the second is used to bridge the white and brown wires.
Before turning on the power supply, you must protect yourself from possible damage. The fact is that most modern PSUs refuse to start "idle". It needs a minimum load to turn on, so you must plug in a cooler, hard drive, or floppy drive. Connect the device via Molex.
Now everything is ready to start and check the performance of the power supply. It is necessary to connect the equipment to a power source using a conventional network cable that is used in the operation of the system unit.
Start the power supply with the toggle switch on the back of the PSU. If you connected the cooler, then it should work with fully functional equipment. If the power supply starts up without additional load, this will reduce the life of the device.
So, now you know how the power supply is turned on without a computer using jumpers. There is nothing complicated in this procedure, so in an emergency you can carry out a simple diagnosis of the equipment. If you do not understand any points and steps from the instructions, then write questions in the comments. We quickly find solutions to problems and answer each visitor!
In some situations, it is required to start the power supply without using a 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 electric shock, so all actions are performed on your own risk.
Reasons why you may need to start the PSU without using a PC:
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:
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 connecting hard drives 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, let's take a step-by-step look at the general steps to start 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:
note that units equipped with 20 pin and 20+4 pin connectors should not be switched on without load. 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!
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.
A constant voltage source 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.
To convert the power supply into a charger, you will need to perform Schottky diode replacement to ultra-fast. The main advantage of such a memory is that it has a small weight and dimensions. The disadvantages of this device is the sensitivity to overloads and short circuits. To eliminate overloads and short circuits, it is required to make a protection system.
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.
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.
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.
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 the operation of the computer require elimination. In the event that after pressing the power button, the computer does not start, then the probable cause of the malfunction may be a failed motherboard or power supply. It will not be advisable to buy both component parts, initially you need to check which part is out of order.
In this article, you will learn how check if the power supply is working.
There are several other reasons why you need to starting the power supply without a computer, namely in the case of using two power supplies in one case, if necessary, checking the performance 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 provides computer components with uninterrupted power supply and converts the mains voltage to a predetermined value. In some way, using a power supply stabilizes and protects your computer from minor power outages. And the fan of this device, which starts working after you turn on the power supply, is part of the cooling system of the internal parts of the system unit.
The POWER button 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 load). But it's not.
Turns out, run power supply without motherboard poses no great difficulty. This is easy to do, having a computer at hand on which you can run the power supply, paper clip and tweezers and follow these instructions:
1. Any operation related to disconnection and connection of wires and connectors must be carried out with the computer turned off, the network cable disconnected and the cover of the system unit removed. Do not forget about safety measures, since some mounting elements will be energized.
2. Disconnect all connectors that connect the power supply to the motherboard and other devices. Since the power supply can only be started under load, it means that one of the devices (hard disk or DVD / CD drive) must be left connected. The figure shows main power supply connectors
Fig 2. PSU connectors.
Where:
1 - connector for connecting a floppy drive. Disable.
2 - ATA( IDE)-connector. Connects power to an ATA hard drive or optical drive. We leave one connector connected to the connector on the hard drive or drive (DVD / CD).
3 – SATA connector. Connects power to S ATA hard drive. Disable.
4 - ATX 12V connector (connects power to the processor). Disable.
5 – connector (main 8-pin and additional 6-pin) for powering PCI-E cards. Disable.
6 - 24-pin ATX connector (connects power to the motherboard). Disable.
7 - if there are other connectors - we also disable them.
To start the power supply we need 24 pin connectorATX(see picture).
Figure 3. 24-pin connector pinoutsATX
3. The connector that connected the motherboard and the power supply is equipped with pins PS-ON and GND. Where the PS-ON pin is on, it is the 16th pin of the connector, on which the wire is most often green (less often this wire is gray, since Chinese manufacturers confuse the English words green and gray). 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 selected correctly and starting the power supply will not damage the PSU 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. To start power supply occurred immediately after power was applied to it, the PS-ON and GND wires must remain connected. But it is better if there is a switch between these wires and when you turn on the power supply, you yourself will manage the power supply.
5. In the case when it is required to use the power supply for long-term operation, and not for testing purposes, it is necessary to take into account the fact that the power indicated on the PSU is peak. If you want to turn on the power supply for the purpose of its long-term operation, then you need to use the average power.
