Check the optocoupler and the TL431 regulator. If the feedback path is open, the controller will continuously ramp up the voltage until it hits its maximum threshold and shuts down safely. Component Care and Preventive Maintenance
A technician on EletrônicaBR repaired a Wannien 101V0 board inside an ASUS EXA1202YH charger. The board was completely dead. This is what he found and fixed:
: Often the best source for high-quality photos of the board, which can be used for "visual tracing" of the circuit paths. Cautionary Note
The large 400V capacitor can hold a dangerous charge long after the device is unplugged. Use a high-wattage resistor (e.g., 2k ohms, 5W) to safely discharge it. Verify zero voltage with a multimeter before touching the board.
You can find surplus or refurbished units through specialized industrial sellers like Aeliya Marine Tech or via eBay Listings .
Ensure that any thermal interface material (silicone pads or thermal paste) between the power MOSFET/Schottky diode and their respective heatsinks is fresh and properly applied. Excessive heat is the primary catalyst for component degradation.
Finding a "wannien 101v0 power supply schematic free" is a real challenge, but it's not impossible. The official document is not publicly available, but a generous member of the Badcaps.net community has offered to share their own meticulously redrawn version.
Uses an optocoupler and a reference voltage regulator (such as a TL431) to monitor output voltage and signal the PWM controller to adjust its timing if the voltage drifts. Common Failure Points and Troubleshooting
The Wannien 101V0 utilizes a standardized multi-stage conversion topology to step down dangerous household AC voltages into stable, regulated DC rails (typically 12V, 5V, or 3.3V).
These units usually use a TL431 shunt regulator for voltage control. If the output voltage is stuck at maximum (30V+) and the knob does nothing, the feedback loop is broken.
Monitors the output voltage and tells the optocoupler to signal the PWM IC to adjust its pulse width if the voltage drops or rises. Common Failure Points and Troubleshooting
Grounding and layout: