The main power supply connector for a motherboard has either 20 or 24 separate pins.
Power supply testers offer a full range of diagnostics for each voltage normally supplied by computer power supplies and they do not require a computer. Testing for +12 volts, -12 volts, +5 volts, -5 volts (if present) and +3.3 volts can be accomplished with one simple device in a few minutes. Learn use these safe, efficient testing devices to troubleshoot and diagnose computer power supplies for basic functionality and the ability to supply power.
Instructions
1. Plug the large 20-pin or 24-pin motherboard power lead to the matching socket on the power supply tester, making sure to plug it in until the plastic retaining tab locks into place on the unit.
2. Connect any one of the large hard drive connectors into the matching socket on the tester.
3. Plug the power cord into the back of the power supply unit and then plug the cord into a wall outlet.
4. Read the LCD or LED display on the tester to determine whether the particular cable plugged into the tester is producing a reliable voltage. Refer to the user manual or manufacturer's website for particular instructions and directions for interpreting the results.
5. Disconnect the power cable from the wall and remove the cable being tested. Leave the main 20-pin or 24-pin motherboard power connector attached.
6. Connect a second peripheral power supply lead to the tester and repeat the testing cycle, powering down the unit after each test. Repeat this for each connector on the power supply.
Tags: power supply, volts volts, 20-pin 24-pin, 20-pin 24-pin motherboard, 24-pin motherboard