Measure the voltage across the main bulk capacitor. It should read around 310V-340V DC. If 0V, check the AC cord, line filter, and thermistor/resistor in series with the AC line.
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Wannien 101V0 Power Supply Schematic Exclusive: Complete Circuit Analysis and Repair Guide
Switching transistors may fail "open" or "shorted," preventing the supply from oscillating. wannien 101v0 power supply schematic exclusive
The following component values and observations have been confirmed by repair technicians and are the closest thing to a "schematic" currently available for the Wannien 101V0:
Once the failure point is identified, repairing the Wannien 101V0 is straightforward:
What makes the Wannien 101v0 distinct is its : Outputs Controlled : Labeled as Out1, Out2, Out3, and Out4 . Measure the voltage across the main bulk capacitor
The board typically features a dynamic sub-regulation layout:
Commonly features a dual or triple rail configuration (e.g., +5V DC for logic, +12V or +24V DC for backlights/inverters/motors) Cooling: Passive convection cooling 2. Structural Breakdown of the Schematic
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Standard silicon diodes cannot handle 100kHz switching frequencies. The Wannien 101V0 uses ultra-fast Schottky barrier rectifiers (dual-diode common cathode packages are common here) to rectify the secondary AC pulses back into DC.
Wannien 101V0 Power Supply Schematic Exclusive: Complete Circuit Analysis and Repair Guide
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pin of U1. If it is 0V, check the high-value startup resistors (R1, R2) as they frequently go open-circuit. Overload / Hiccup Mode
| Step | Action | |------|--------| | 1 | – Look for IC part numbers (e.g., “3842”, “LD7575”, “OB2269”). Search datasheet of that IC → application circuit is often 90% of the schematic. | | 2 | Search more broadly – Try: Wannien 101V0 circuit diagram , Wannien power supply schematic , or search by IC + “power supply schematic”. | | 3 | Use generic repair guides – For flyback supplies, schematics from similar-rated units (e.g., 12V 8A) are highly similar. Compare with your board layout. | | 4 | Check AliExpress/B2B listings – Sometimes sellers include wiring diagrams. Reverse image search the PCB photo. | | 5 | Trace manually – If you have the unit, draw the primary side: rectifier → bulk cap → switching transistor → transformer → output rectifier. Most follow standard AN-556 or AN-4137 application notes. |