To protect yourself, always disconnect the AC power cable from the wall outlet before opening the case or touching any internal wires. To do this safely, you can either probe the wires coming out of the supply while it is plugged in and turned on, or disconnect the unit and test the cables individually.
How to Test a Power Supply Without a Multimeter: Safe Methods
You will need to set the device to the direct current voltage (DCV) setting. This bridges the circuit that tells the supply to activate.
Refer to the chart on the power supply label to identify the voltage for each wire color. Additionally, ensure that the ventilation grilles are not clogged with debris.
Test Power Supply Without Multimeter: Safe Methods and Steps
A failing power unit can cause unexpected shutdowns, data loss, and even damage to other components. If you are testing a desktop computer, place the case on a non-conductive surface like a wooden table to avoid accidental shorts.
More About How to test my power supply
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