Wannien 101v0 Power — Supply Schematic

A: Audible noise usually indicates a failing output filter capacitor or a saturated transformer. Replace the large secondary capacitors first. If the whine persists, check the small ceramic capacitor (often 102/1nF) across the primary side snubber (RCD network).

: An integrated circuit (IC) pulse-width modulation (PWM) controller regulates the switching frequency of a primary power MOSFET. This components pulses the high-voltage DC across the primary windings of the central isolation transformer. wannien 101v0 power supply schematic

This usually takes 30–60 minutes and yields a reliable schematic. A: Audible noise usually indicates a failing output

Unscrew the Wannien 101V0 board and inspect it under good lighting. : An integrated circuit (IC) pulse-width modulation (PWM)

Power supply boards like the Wannien 101V0 contain high-voltage circuits that can be lethal. The large capacitor on the primary side can store a dangerous charge (up to 340V DC) for a long time, even after the device is unplugged.