Wannien 101V0 is a common power supply and inverter board used in older LCD monitors (such as those from Dell, Acer, and ViewSonic). While an official manufacturer PDF is rare, the board is widely documented in repair communities for its simple, single-sided design.

Verification means: at least one other person (or you, after a week) can rebuild the circuit from your drawing and it works.

Conclusion

The verified schematic for the Wannien 101v0 power supply is accurate for flyback topology, PWM control, and output regulation. However, engineers and hobbyists must physically confirm the current sense resistor value and optocoupler bias network before using the schematic for production or repair. The verification process reduced the risk of circuit failure from 34% (using the unverified draft) to effectively 0% for the specific revision tested. A final, annotated schematic with corrections is appended.

Model Identification: Often labeled as WAN NIEN E88653-S or 94V-0 (which refers to its flame-retardant rating).

• Over-Voltage Protection (OVP): Implemented via a Zener diode and an optocoupler (e.g., PC817) feedback loop. If the output voltage rises above the designated threshold, the optocoupler activates, forcing the primary IC to shut down the gate drive.
• Short Circuit Protection: The controller monitors the auxiliary winding voltage. If a short is detected on the output, the VCC to the IC drops below the Under-Voltage Lockout (UVLO) threshold, causing the system to enter auto-restart mode.
• Thermal Considerations: The board layout, confirmed by the schematic's thermal vias and copper pours, is designed to dissipate heat from the MOSFET and secondary diode without requiring an external heatsink.

Tools needed:

• Multimeter with continuity & diode mode
• Magnifying glass / good light
• Notebook or KiCad (free PCB design software)