How to Manually Test a Power Supply With a Multimeter
How to Manually Test a Power Supply with a Multimeter Read Important PC Repair Safety Tips because of the dangers involved with the process. Manually testing a power supply Open your computer’s case. In short, this involves turning off the computer, removing . Mar 08, · Manually Test a (PSU) Power Supply With a Multimeter by BritecNOTE: This testing applies only to the standard ATX PSU, it does not apply to proprietary PSU's.
Thank you for supporting the work I put into this site! Power supply failure is one of the most common problems faced by PC users. A faulty power supply is not easy to detect because it cannot be monitored through any software and the fault can be diagnosed by testing only. It can get further difficult to detect the fault when the power supply is turning on but one of the voltage rails is not functioning properly and giving out improper voltages, which is quite dangerous and can cause damage to your internal components.
So, to help you out on this matter, here I will tell you how to test a power supply for any errors or failure to make sure sith your PSU is working properly or not. Hold the pin or pin connector in such a way that the connector clip is facing up and the pins toward you. Now count aith fourth and fifth pin from the top-left of the connector.
Here the fourth pin is the power on multimeeter sensor pin and the fifth pin is the ground pin. Insert a paper clip, solid copper wire, or small wire in the 4 th and the 5 th pin you have located. This still indicates suppl the PSU is functioning normally. Below is such a power supply jumper adapter and it supports both pin and pin connectors.
The jumper method can only tell you that the PSU is powering up but it does not tell you whether all the voltage rails are functioning properly and the connectors are outputting proper voltages. So, to test the voltage rails and connectors, you have to use the below-mentioned methods.
You can use a basic and inexpensive multimeter to check the PSU rails by measuring the voltages across various connectors of the power supply. It is also used to check the connectors of the PSU and whether they are outputting proper voltages. If the voltage levels are significantly lower or higher than the reference then it may fo damage to the components connected to the PSU. To test the various connectors and voltage rails, you have tets know the connector pinout diagram and how to perform a wedding ceremony color coding for eupply voltages to get the reading on the multimeter.
First, connect the Red lead of the multimeter to the Red wire pin of the Molex connector and Black wire to any ground wire of the Molex connector. If it is working fine then your multimeter will show a voltage at around 12V with a slight variation. Using the same principle or procedure, you can check other PSU connectors by following the Pinout diagrams of the connectors.
Below are the Pinout diagrams of various connectors of the PSU. The tp reading should not deviate too much from the reference or specified voltage output of the rail e. The same thing is applicable for other rails that include 5V and 3. The Intel Standard for different Voltage Rails are shown below:.
Generally, a power supply tester has a small LCD screen attached to it that shows you the voltage output on all the Rails. Generally, Power good values are often considered abnormal if detected lower than ms or higher than ms for the most power supply testers available in the market today. If you are looking for a power supply tester from a well-known and reputable brand then Supplyy Dr. Power II is what you should buy.
It is also of the best power supply testers available tst the market. If you are getting a 0 ms value, then it means the power supply is dead and supoly functioning. The device has built-in output connectors diagnostic system, low-voltage, high-voltage, no voltage, PG alarm systems to notify you of any errors, instability, or abnormal behavior with the power supply.
Buy Thermaltake Dr. A generic power supply tester with a metal body made of aluminum alloy. It comes with a 1. To use the device, just insert the pin or pin and P4, P6, or P8 plug mulyimeter the corresponding position of the power tester. If the values of each group do not flash, it indicates that the power input of what is t fal cookware power supply how to add sound to flash 8 normal.
If the voltage signal of a circuit is not detected such tto a pin or pin connector or the detected voltage exceeds the normal range, the powsr will send out hlw warning sound for a long time. If the corresponding voltage or PG value display multimete is flashing, it means that the power supply is at fault. If the light is not ON, it indicates that the interface line group is faulty.
You can download its free version from the link given below. Note: OCCT stress test tool puts a lot of stress on your components and if you are not sure on how to use it then it may cause ,ultimeter to your components and may fry them if they could not handle the stress over the running period of the test.
If you have queries regarding the power supply testing or troubleshooting then you can ask them in the comment section below. I have done M. Tech in How to test pc power supply with multimeter and B. Notify me by email sjpply the comment gets approved.
How To Guides. Related Posts. Leave a Reply Cancel reply Notify me by email when the comment gets approved.
20-Pin and 24-Pin Connector
10 hours ago · How to Test Power Supply of PC for faults and weakness. Power supply failure is one of the most common problems faced by PC users. If your power supply fails then your PC won’t turn on and it can hamper your work. A faulty power supply is not easy to detect because it cannot be monitored through any software and the fault can be diagnosed by testing only. Sep 21, · There are two basic methods to check if the computer power supply is working correctly. Check if PSU turns on or not (with a paper clip) Check the individual pins (with a testing unit like multimeter) Checking if PSU Powers On. This is an easy way .
Testing a power supply manually with a multimeter is one of two ways to test a power supply in a computer. A properly executed PSU test using a multimeter should confirm that the power supply is in good working order or if it should be replaced. These instructions apply to a standard ATX power supply. Almost all modern consumer power supplies are ATX power supplies.
Manually testing a power supply involves working closely with high voltage electricity. Don't skip this step! 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. Open your computer's case. In short, this involves turning off the computer, removing the power cable, and unplugging anything else connected to the outside of your computer. 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.
Unplug the power connectors from each and every internal device. An easy way to confirm that each power connector is unplugged is to work from the bundle of power cables coming from the power supply inside the PC. Each group of wires should terminate to one or more power connectors. 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.
Group all of the power cables and connectors together for easy testing. As you're organizing the power cables, we highly recommend rerouting them and pulling them as far away from the computer case as possible.
This will make it as easy as possible to test the power supply connections. Short out pins 15 and 16 on the pin motherboard power connector with a small piece of wire. Confirm that the power supply voltage switch located on the power supply is properly set for your country. Check the Foreign Outlet Guide for voltage settings in other countries. Plug the PSU into a live outlet and flip the switch on the back of the power supply.
Assuming that the power supply is at least minimally functional and that you've properly shorted the pins in Step 5, you should hear the fan begin to run. Some power supplies don't have a switch on the back of the unit.
If the PSU you're testing doesn't, the fan should begin to run immediately after plugging the unit into the wall. Just because the fan is running doesn't mean that your power supply is supplying power to your devices properly. You'll need to continue testing to confirm that. Test the 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. We recommend testing every pin on the pin connector that carries a voltage.
This will confirm that each line is supplying the proper voltage and that each pin is properly terminated. Document the number that the multimeter shows for each voltage tested and confirm that the reported voltage is within approved tolerance.
You can reference power supply voltage tolerances for a list of proper ranges for each voltage. Are any voltages outside the approved tolerance? If yes, replace the power supply. 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.
If you're not interested in testing your PSU further, skip to Step Turn off the switch on the back of the power supply and unplug it from the wall.
Reconnect all of your internal devices to power. Also, don't forget to remove the short you created in Step 5 before plugging back in the pin motherboard power connector. The biggest mistake made at this point is forgetting to plug everything back in. Aside from the main power connector to the motherboard, don't forget to provide power to your hard drive s , an optical drive s , and floppy drive.
Some motherboards require an additional 4, 6, or 8-pin power connector and some video cards need dedicated power, too. 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.
Your computer or motherboard manual should explain how to do this. Repeat Step 9 and Step 10, testing and documenting the voltages for other power connectors like the 4-pin peripheral power connector, the pin SATA power connector, and the 4-pin floppy power connector. Just as with the pin motherboard power connector, if any voltages fall too far outside the listed voltage, you should replace the power supply.
Once your testing is complete, turn off and unplug the PC and then put the cover back on the case. Did your power supply pass your tests but your computer still isn't turning on properly? There are several reasons a computer won't start other than a bad power supply.
Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile.
Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Tim Fisher. General Manager, VP, Lifewire. He writes troubleshooting content and is the General Manager of Lifewire. Facebook Twitter LinkedIn. Updated on February 24, Michael Barton Heine Jr. Lifewire Tech Review Board Member. Article reviewed on May 28, Tweet Share Email.
If the multimeter you're using doesn't have an auto-ranging feature, set the range to Was this page helpful? Thanks for letting us know! Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Tell us why! More from Lifewire. How to Install a Desktop Power Supply. Your Privacy Rights. To change or withdraw your consent choices for Lifewire. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page.
These choices will be signaled globally to our partners and will not affect browsing data. We and our partners process data to: Actively scan device characteristics for identification.
I Accept Show Purposes.