Wannien 101v0 Power Supply Schematic Jun 2026
It became a rite of passage for amateur fixers. If you could troubleshoot a 101V0—identifying the "death capacitor" or the blown Schottky diode—you could fix half the electronics in your house. Where is it now?
The power supply was completely dead, with no output voltage. When connected to a 220V mains supply, the primary side of the board was receiving the correct high voltage after initial repairs, but the secondary side remained at 0V, indicating a fault in the primary-side switching circuit or the secondary-side regulation components .
The 101V0 board generally operates through four primary stages to convert high-voltage AC into usable low-voltage DC: WEHO Electronics Input & Rectification: The circuit starts at the AC input terminals (Line and Neutral), protected by a and often a (Metal Oxide Varistor) for surge protection. A bridge rectifier converts the AC input into a high-voltage pulsating DC. Filtering: electrolytic capacitor wannien 101v0 power supply schematic
Use a multimeter to verify the main fuse and check the voltage across the primary filter capacitor.
Carefully probe the pins of the output wiring harness (look for markings on the board like GND , 5V , 12V ). It became a rite of passage for amateur fixers
The power supply is completely dead with no output.
: A network of X and Y-rated safety capacitors alongside a dual-winding common-mode choke suppresses high-frequency noise from feeding back into your main power grid. 2. High-Voltage Rectification and Filtering The power supply was completely dead, with no output voltage
Note: Many 101V0 variants simplify or omit items (e.g., no common‑mode choke, minimal surge protection, low‑grade electrolytics). Treat the above as a robust template rather than a guaranteed pin‑by‑pin match.
| Component | What to look for | Likely schematic family | | :--- | :--- | :--- | | | 8-pin DIP: UC3842, UC3843, OB2269 | Standard UC3842 Flyback | | Dual Op-Amp | 8-pin: LM358, LM393 (for voltage/current limit) | Battery charger or LED PSU | | Main Switcher | MOSFET: 4N60, 7N65, 8N60 | 150W-300W flyback | | Output Diode | TO-220: MBR20100, SBL2040 (Schottky) | Low voltage, high current |
+12V output ---[Resistor Divider]---(TL431 Shunt Regulator)---[LED side of PC817 Optocoupler]---(GND)
