After repairs, always use a (40W-100W incandescent) in series with the AC line. If the bulb stays bright, you still have a short.
Troubleshooting a dead or unstable Wannien 101V0 power supply board should be done in systematic stages to narrow down the problem safely. Step 1: The Visual Inspection
Ensure all connectors are secure and free from corrosion 1.2.2. 3. Accessing the Schematic Diagram wannien 101v0 power supply schematic
Primary switching stage
: Converts alternating current into raw, pulsating DC voltage. After repairs, always use a (40W-100W incandescent) in
You don’t need the original. Grab a multimeter and a notebook. Follow this order:
: Locate the main entry point on the circuit board. Trace the lines through the fuse and input inductors. If the fuse is clear, move down the circuit. Step 1: The Visual Inspection Ensure all connectors
When navigating the Wannien 101V0 circuit board without a factory-printed paper manual, matching the components to standard values found across similar Wan Nien E88653 platform iterations is vital: Component Reference Typical Part Type / Role Common Failure State Ceramic Fuse (2.5A - 5A / 250V) Open circuit due to shorted MOSFET Primary Caps 100µF to 220µF (400V/450V) High ESR, bulging, leaking electrolyte Secondary Caps Low-ESR Electrolytics (10V - 25V) Volumetric bloating, ripple voltage leak Q1 / MOSFET N-Channel Power MOSFET Gate-to-Drain dead short circuit R104 / Start-up Flameproof Resistor (1kΩ - 2.2kΩ) Burned open, halting PWM initialization Optocoupler PC817 or equivalent Degradation of current transfer ratio (CTR) Diagnostic Step-by-Step for the 101V0 Platform
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Do not just replace the fuse. If it blew, a short circuit caused it. Switch your DMM to Diode Test mode and check the four legs of the bridge rectifier. If any diode reads 0.00V in both directions, it is shorted.
Unscrew the Wannien 101V0 board and inspect it under good lighting.