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 efficiency of cathode lamps or new coolers.
Why such difficulties?
It is simply necessary to turn on the power supply without a computer if it is being repaired, because if you constantly turn off and turn on the computer, this will negatively affect the components of the PC, due to premature battery failure. In addition, any experiments with the computer may lead to unstable operation of the operating system.First start
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ATX devices can produce the following voltages: 3.3, 12 and 5 V. In addition, they have good power (from 250 to 350 watts). But the question is: “How to turn on the computer power supply?” Above, we have already, so to speak, outlined the procedure in a nutshell, and now let's try to understand in more detail.
In the old days it was easier
It is curious that old blocks that 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 small wiring that needs to be connected in a certain way. We already described how to turn on the power supply without a computer, however, we ask you to disconnect all the wires going to the motherboard, hard disks, drives and other accessories. Better yet, remove the element we need from the system unit and work away from it., : . . . . , . , . . , .
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First, check the presence of primary power supply ~ 220V at the input of the power supply. Among the reasons for the absence can be called a malfunction of the power filter, sockets, plugs, cable break. Also, the problem may lie in the uninterruptible power supply. On the back side of many units is a power switch - it may also be faulty or turned off.In case of primary power supply, even if the computer is turned off, there is + 5V voltage at the PSU output (if everything is working properly). This can be checked by testing the contacts of the PSU connector with a tester. We are interested in pin 9, which has a purple wire (+ 5VSB).
Often, the motherboard has a standby voltage LED. If it is active, there is both a standby and primary nutrition.
If the computer still does not turn on, look for other sources of the problem. The most common causes we will consider below.
1. Open circuit in the power button. To check this, use tweezers to close the contacts responsible for turning on the power on your motherboard, or start the PSU 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 remove all adapters temporarily from the slots. In addition, disconnect all USB devices. You can also deactivate the 4-8-pin power connector for the Power Connector + 12V processor.3. . , , , . "", , , , . , , . – .