Wannien 101v0 Power Supply Schematic Verified Jun 2026

A shorted MOSFET or rectifier draws massive current, instantly blowing the main fuse. Secondary Diode, Output Capacitors

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Low-ESR (Equivalent Series Resistance) electrolytic capacitors that smooth out the high-frequency square waves into clean DC outputs.

Works in tandem with the capacitors to eliminate residual switching ripple. Stage 5: The Feedback and Isolation Circuit A shorted MOSFET or rectifier draws massive current,

Usually mounted on a heatsink. Check for shorts between the Drain and Source pins.

Because these boards are heavily used in industrial or enclosed display frames, look closely at interconnect pins under magnification. Oxidized connectors can mimic power supply failure by dropping voltages under load. Check for shorts between the Drain and Source pins

Wannien 101V0 Power Supply: Verified Schematic and Repair Guide

| Reference | Component | Function | |-----------|------------------------|----------------------------------------| | F1 | Fuse (slow‑blow) | Overcurrent protection | | RV1 | Varistor (7D471) | Surge / overvoltage protection | | CX1 | X‑capacitor (0.1–0.33µF) | EMI filtering across L/N | | L1, L2 | Common‑mode choke | Suppresses conducted EMI | | D1–D4 | 1N4007 or similar | Bridge rectifier | | C1 | 47–100µF, 400V | Bulk DC link capacitor | | IC1 | PWM controller | UC3842/3843, OB2263, etc. | | Q1 | MOSFET (600V, e.g., 2N60) | Switching transistor | | T1 | Flyback transformer | Galvanic isolation & voltage conversion| | D5 | Fast recovery diode (e.g., UF4007) | Secondary rectification | | C2, C3 | Low‑ESR electrolytic (e.g., 1000µF, 25V) | Output filtering | | IC2 | Optocoupler (PC817) | Feedback isolation | | IC3 | Voltage reference (TL431) | Sets output voltage via divider |

Pre-regulation / heat distribution