How to Test a PC Power Supply | Jumper Wire, PSU Tester, and Multimeter
CompTIA A+ Hardware - 220-1101 Exam Prep
#powersupply #howto #comptia
In this video, I demonstrate how to test your computer power supply. I review three different options that you can use to test your PSU and explain each in detail.
Timestamps
Intro 00:00
Symptoms 00:53
Three Options 01:20
Jumper Bridge 02:02
Jumper Wire 02:42
PSU Tester 03:30
Multimeter 05:24
Conclusion 08:03
Power Supply Cables Explained - [ Ссылка ]
Power Supply Tester - [ Ссылка ]
****Additional Info****
Standard Advanced Technology eXtended (ATX) power supplies provide + 3.3 volts, +/- 5 volts, and +/- 12 volts of DC power. Most modern components require +12 volt output.
Each voltage output circuit is referred to as a rail and can power multiple devices.
Some computer manufacturers, such as Dell or HP, produce proprietary power supplies. These power supplies might have a unique shape or use different wiring schematics on connectors.
***Most power supplies for custom builds will have all black wires for each rail. However, if you have an older or proprietary power supply, it might have yellow, red or orange wires. These colors represent specific voltages:
Yellow - 12V
Red - 5V
Orange - 3.3V
Some power supplies have a voltage switch that toggles between two voltage settings. Depending on the country, typically you can toggle the voltage switch either between 115 and 230 volts, or between 110 and 220 volts.
115 volts is used in North America.
230 volts is used in Europe.
100 volts is used in Japan.
220 volts is used in most parts of Asia.
If you test the power supply using a multimeter or power supply tester, voltage levels should be within +/- 5% of normal. If they aren't, the power supply is bad or failing and you should replace it.
12 V rail should be between 11.4 and 12.6 volts.
5 V rail should be between 4.7 and 5.25 volts.
3.3 V rail should be between 3.1 and 3.4 volts.
****IMPORTANT****
Take proper safety precautions. Power supplies carry dangerous levels of electrical current. You should:
Never ground yourself when working on a power supply.
Never open or disassemble a power supply. Always replace the entire unit.
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