1. Also, don't forget to remove the short you created in Step 5 before plugging back in the 24-pin motherboard power connector. Turn off the switch on the back of the power supply and unplug it from the wall. Next, attach the leads of your DMM to the input lines. Plug in your power supply, flip the switch on the back if you have one, and then turn on your computer as you normally do with the power switch on the front of the PC.Yes, you’ll be running your computer with the case cover removed, which is perfectly safe as long as you’re careful.It’s not common, but if your PC doesn’t turn on with the cover removed, you may have to move the appropriate jumper on the motherboard to allow this. (adsbygoogle = window.adsbygoogle || []).push({}); link to The Best Commodore Amiga Demos - A Top 100 List. If the measurement is less than 80% of the expected voltage, your problem could be with the transformer or the circuitry providing the primary power. Plug in your power supply, flip the switch on the back if you have one, and then turn on your computer as you normally do with the power switch on the front of the PC. Verbinde die Negativ-Sonde des Multimeter mit einem Masse- (Schwarz) Pin des Steckers. Switch on your multimeter and set its dial to DC volts. Make sure that all pins are terminated as required. If the power supply fan is spinning, there is no need to go to this length and perform this test. How to Test a Computer Power Supply. There is no need to remove the actual power supply unit from the computer nor is there any reason to disconnect any data cables or other cables not originating from the power supply. Test the 24-pin motherboard power connector: Connect the negative probe on the multimeter (black) to any ground wired pin and connect the positive probe (red) to the first power line you want to test. If the multimeter you're using doesn't have an auto-ranging feature, set the range to 10.00V. As one of the two ways to test the computer power supply, using a multimeter is easy and quick. Are any voltages outside the approved tolerance? Connect the GREEN wire with the adjacent BLACK wire. Some motherboards require an additional 4, 6, or 8-pin power connector and some video cards need dedicated power, too. If the PSU you're testing doesn't, the fan should begin to run immediately after plugging the unit into the wall. If you have a negative polarity power supply, then you will get a negative reading. As you're organizing the power cables, we highly recommend rerouting them and pulling them as far away from the computer case as possible. 3. How to Connect an Oscilloscope to a Circuit – A Guide for Beginners. Plug the PSU into a live outlet and flip the switch on the back of the power supply. But that's like saying a car that is up on blocks can drive to the store because the engine starts up. Read Important PC Repair Safety Tips because of the dangers involved with the process. Check the Foreign Outlet Guide for voltage settings in other countries. Test the 24-pin motherboard power connector:Connect the negative probe on the multimeter (black) to any ground wired pin and connect the positive probe (red) to the first power line you want to test. See our How to Troubleshoot a Computer That Won't Turn On guide for more help. Please note, however, that the former – the multimeter test – should only be performed very carefully and usually only when you have previous experience with electrical devices and tests. This video will show you my current progress and the comments will identify the net result Some motherboards require an additional 4, 6, or 8-pin power connector and some video cards need dedicated power, too. There are several reasons a computer won’t start other than a bad power supply. Here are two to look out for: 1. Reconnect all of your internal devices to power. He writes troubleshooting content and is the General Manager of Lifewire. Plug the power supply into the wall. Unplug the power connectors from each and every internal device. Test the 24-pin motherboard power connector: Connect the negative probe on the multimeter (black) to any ground wired pin and connect the positive probe (red) to the first power line you want to test. Document the number that the multimeter shows for each voltage tested and confirm that the reported voltage is within approved tolerance. The biggest mistake made at this point is forgetting to plug everything back in. To get accustomed to using a multimeter, test it on a battery. This will make it as easy as possible to test the power supply connections. Did your power supply pass your tests but your computer still isn’t turning on properly? Once your testing is complete, turn off and unplug the PC and then put the cover back on the case. Turn on your multimeter and set it to read DC voltage. Repeat Step 9 and Step 10, testing and documenting the voltages for other power connectors like the 4-pin peripheral power connector, the 15-pin SATA power connector, and the 4-pin floppy power connector. To measure the secondary output, … Step 5: Examine data This is how you do it: Connect any external resistance device – drive, hard drive, coolers – to the power supply unit; Now take the multimeter set to measure the voltage, and connect the negative wire of the diagnostic tool to the black contact wire of the 20/24-pin power supply … Once your testing is complete, turn off and unplug the PC and then put the cover back on the case. Check the Foreign Outlet Guide for voltage settings in other countries. Plug the paperclip into the green pin (pin 15) and into one of the neighboring black pins. We recommend testing every pin on the 24-pin connector that carries a voltage. I'm Mark Baxman, the guy behind retrotechlab.com. If yes, replace the power supply. To make testing your power supply easier, you should also move your disconnected and open computer case somewhere easy to work like on a table or other flat, non-static surface. This will confirm that each line is supplying the proper voltage and that each pin is properly terminated. If all voltages are within tolerance, your power supply isn’t defective.If your power supply passes your tests, it’s highly recommended that you continue testing to confirm that it can operate properly under a load. Power supply multimeter test guide. You can use a multimeter to test your PC’s power switch. … If your power supply passes your tests, it's highly recommended that you continue testing to confirm that it can operate properly under a load. Just as with the 24-pin motherboard power connector, if any voltages fall too far outside the listed voltage, you should replace the power supply. You will need a paper clip or a PSU jumper to perform this test. When a component is failing, sometimes you’ll see some warning signs in advance. Safety should be your primary concern during a power supply test and there are several points you should be aware of before starting this process. If there is an adequate electrical connection, the multimeter will beep. Confirm that the power supply voltage switch located on the power supply is properly set for your country. Yes, you'll be running your computer with the case cover removed, which is perfectly safe as long as you're careful. Test for a potential open circuit by using one multimeter lead to touch one of the prongs on the AC side of power cord. Also, don’t forget to remove the short you created in Step 5 before plugging back in the 24-pin motherboard power connector.The biggest mistake made at this point is forgetting to plug everything back in. Edit: because a lot of folks have brought them up, I'll go ahead and address multimeters. The multimeter’s display will change as the current flows through it. How to Test a Power Supply Using a Multimeter. One of the simplest ways to do it is by using a multimeter.This is the manual method of testing a PSU as opposed to purchasing a power supply tester that can automatically detect problems. Short out pins 15 and 16 on the 24-pin motherboard power connector with a small piece of wire.You’ll probably need to take a look at the ATX 24-pin 12V Power Supply Pinout table to determine the locations of these two pins. The 24-pin main power connector has +3.3 VDC, +5 VDC, -5 VDC (optional), +12 VDC, and -12 VDC lines across multiple pins. This is the site where I share everything I've learned. You'll need to continue testing to confirm that. Plug your power supply into an AC outlet. Assuming your power supply tested good or you've replaced your power supply with a new one, you can now turn your computer back on and/or continue troubleshooting the problem you're having. 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