A fuse and a Metal Oxide Varistor (MOV) protect the circuit against over-current and voltage surges.

The power supply is entering "hiccup mode" to protect itself. Check the secondary Schottky diodes for a short circuit. Dried-out Electrolytic Capacitors

If the bulb glows at full, brilliant brightness continuously, a short circuit still exists on the primary side. Unplug the board immediately and recheck your work.

What is the on the primary side?

Locate the main integrated circuits (usually 8-pin or 14-pin DIP chips).

Discolored PCB fiberglass around diodes and resistors, indicating chronic overheating.

Even without the Wannien 101V0 schematic, dozens of free resources can teach you everything you need:

To help narrow down the exact schematic variation for your repair project, could you share a bit more context? Please let me know: What is your power supply experiencing?

Voltage spikes or overheating can cause the gate, drain, and source pins of the MOSFET to short-circuit.

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The search for the is more common than you think. Unfortunately, Wannien (a lesser-known brand in the sea of Chinese OEM power supplies) is notorious for poor documentation. Official manuals are nearly impossible to find, and the original manufacturer often treats schematics as trade secrets.

A high-voltage electrolytic capacitor (usually rated at 400V or 450V). It smooths the pulsating DC into a stable high-voltage DC bus (approximately 310V DC for a 220V AC input, or 160V DC for a 110V AC input). 3. PWM Control and High-Frequency Switching

The keyword "free" in the search is the most legally and ethically complex part. Many schematics, including those for Wannien products, are considered copyrighted technical data. Distributing them without permission from the copyright holder (often the manufacturer or a licensed service center) may violate intellectual property laws. While some manufacturers openly release schematics for older or open-source hardware, most do not. Free schematics found on obscure forums, file-sharing sites, or personal blogs may be shared without authorization. Using them could expose a technician to legal liability, though enforcement against individuals for a single schematic is rare. More critically, free schematics found online are often incomplete, scanned poorly, or deliberately altered. A missing component value or mislabeled pin can lead to incorrect repairs, causing further damage to the power supply or even creating a fire hazard.