Step 6 / 14
How does a PC power supply (ATX) work?
Even with the PC off, a small part of the supply runs: 5VSB. Switch to "On" at the top right and watch which sections wake up when you press the power button. Then use "Find the fault" to track down the commonest faults by measuring.
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⚠ Safety: Everything in the red area is at mains voltage, and the bulk capacitor can stay at high voltage after unplugging. Before opening the case, unplug, wait a few minutes and discharge the capacitor.
Next step: Step 7How does a UPS (uninterruptible power supply) work?→