Some multimeters may not offer a range, so you may need to choose the approximate voltage on a dial. If it doesn't then it's dead. Don't skimp on the power supply, as you may regret it later. To create this article, 13 people, some anonymous, worked to edit and improve it over time. You will be inserting the ends of the paperclip into the green pin there should be only one and a neighboring black pin. Power supplies that fail can damage other components in your computer, especially the motherboard. It should be noted that this check indicates the ability of the power supply unit to switch on.
If you can't hold the wires or terminals with the probes, use a stand or binder clip to secure them so you don't have to hold them with your hand. What if I can't see the power supply sticker? But there's an easier way: Use a power supply calculator. And as much as you don't want to believe it's the problem, testing your power supply should be part of your troubleshooting—it might be on the way out. In addition, the power supply may unit fail if an incorrect calculation was made when it had been selected for a particular computer configuration. Lastly, if you power down your computer, and take off your side panel, there's a good chance a sticker will be on the power supply unit itself that has more detailed info about it. The steps in doing so are listed in the additional information links listed in the next section of this page.
He is also an accomplished public speaker and PowerPoint presenter. Others will turn on automatically. All power supplies, like the one shown to the right, have a sticker that gives all important specifications. Before you blame the new power supply, determine if your motherboard input connector is 20 or 24 pin. Use a pin diagram to identify the different testing locations link in Resources.
Customers would return a new bulb and claim it was bad. The unit should provide adequate wattage for your needs. So will the sites for many stores selling the units. The upside is that the program is free and offers many more useful features other than just monitoring voltage. Remove the cord connected to the power supply on the back of the computer. Run these quick tests before you start swapping out expensive hardware.
It came with the nVidia GeForce 9100 graphics card built in the motherboard. Choosing a power supply for a computer, you need to be guided by its power, based on the number of consumers that will be connected to it. In case you do not see any problems with capacitors, it is recommended to remove all dust from the power unit, lubricate the fan and assemble the device back, and then try connecting it again. These are available online and from computer stores, and are not very expensive. The corroded connection limited the current.
It is necessary to pay attention to the capacitors. Figure A Make sure that the power supply is set to 115 volts. To create this article, 13 people, some anonymous, worked to edit and improve it over time. This connector is keyed to prevent it from being inserted backwards. Refer the unit to a qualified electrician, or better yet, recycle it and replace it with a new or refurbished one The cost of having a power supply repaired is often more than the cost of a replacement unit. With such a connection black contact will be considered grounding. If the power supply fails, the entire computer will not be able to operate.
The Answer SuperUser contributor Grant writes: Unplug the power supply from any of the components inside the computer or just remove it from the computer completely. Figure F Connect the red probe to a yellow wire and the black probe to a black wire. Your best bet to avoid electrocution is to attach the multimeter to an unplugged power strip and then plug the power strip into the wall outlet. Want to read more answers from other tech-savvy Stack Exchange users? The managers didn't like it because the managers though the inside of the computer was ugly and customer's didn't want to see it. About the Author James T Wood is a teacher, blogger and author. This tutorial will show you how. Power-supply problems can also cause lockups, unexpected reboots, and intermittent boot problems.
If you have to force too hard, try turning the connector around. A power supply tester lets you stay a bit more removed from the electricity than with a multimeter test. In this case the multimer shows the voltage to be just fine in an open circuit condition, but as soon as you draw any current, it drops to an absurdly low level. This will let you know that the power supply is at least working. Testing a power supply is a common troubleshooting step and can be done safely if you exercise common sense and follow directions exactly. So you need a multimeters to measure voltage, and a resistance as a linear load and an accurate estimate of the loading characterstics of the mobo in order to draw any conclusions.
Of course the cold turn off should never be done if it can be avouded. To learn more, see our. When replacing the P8 and P9 connectors back on the motherboard, remember that the two black ground wires should be next to each other. All power supplies are required by formerly known as Underwriters Laboratories to include a sticker with power ratings on it. Email your technology questions to me at , or post them to a community of helpful folks on the.
I tend to troubleshoot other hardware first and the power supply last. With a little careful shopping you can even find Have something to add to the explanation? If the power supply fails, the reason would be in its poor quality or in the constant fluctuations of voltage across the electric network. The main difference between the two is the number of connectors attached to the wires. It is very difficult to connect most Molex connectors improperly, but if you are determined and strong enough, it can be done. I replaced the supply and that fixed the problem.