Verify the reference voltage pin of the TL431 (should read roughly 2.5V during operation).
The main filter capacitor on the primary side can hold up to 400V DC even after the power supply is unplugged. Always safely discharge this capacitor using a discharge tool or a high-wattage resistor before touching the board. Likely Cause Fix / Component to Test Completely Dead (No Output, No Lights) Blown Fuse or Shorted MOSFET
Most Wannien 101V0 boards utilize a Switched-Mode Power Supply (SMPS) flyback topology. This design efficiently steps down high-voltage AC mains power to low-voltage DC. The circuit is divided into two distinct sections separated by an isolation barrier. 1. The Primary Side (High Voltage) wannien 101v0 power supply schematic free
Look for high-value resistors (typically 100kΩ to 470kΩ) connected from the positive high-voltage DC rail to the VCCcap V sub cap C cap C end-sub
However, do not despair. This article will explain the likely internal architecture of the 101v0, provide a “free” alternative to the official schematic by helping you trace the circuit yourself, and point you to crowd-sourced resources where this elusive diagram has been shared. Verify the reference voltage pin of the TL431
High-current paths around the rectifier and MOSFET can burn away during a short circuit. Reinforce repaired PCB traces with solid copper wire if the trace material has delaminated.
A compact, robust power supply for hobby PCBs: Likely Cause Fix / Component to Test Completely
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Typically universal AC input (90V – 264V AC, 50/60Hz)