3V, +5V, and +12V rails; each should read within ten percent of their labeled values. Voltage spikes or drops under no load, or larger deviations when a load is applied, indicate a failing regulator stage.
Step-by-Step Troubleshooting for PC Power Supply Failure
Voltage spikes or drops under no load, or larger deviations when a load is applied, indicate a failing regulator stage. A swollen capacitor cannot filter voltage effectively, causing erratic behavior under varying loads.
When a PC fails to power on, the first component many technicians suspect is the power supply unit. If the readings fluctuate wildly under load, the internal transformer or regulation circuitry is likely degraded.
Troubleshoot PC Power Supply Failure Steps
Bent or broken retention pins can prevent proper contact, causing the system to behave as if power is absent. Replacing these capacitors can restore function, but requires careful soldering and adherence to safety protocols due to stored energy.
More About How to fix a power supply for pc
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