If you are looking to repair or understand this board, here is the breakdown of what makes it "interesting" from a hobbyist perspective: Integrated Design : This board is a "combo" unit, meaning it houses both the AC-to-DC power supply high-voltage inverter
(frequently rated around 450V) smooths the pulsating DC before it enters the high-frequency switching stage. Switching & Transformer: PWM controller chip Power MOSFET drive the primary side of a high-frequency transformer
Through the collective knowledge of online communities, we can identify this board and many of its common failure points, as it is widely found in:
However, here’s a practical guide to help you proceed: wannien 101v0 power supply schematic
: Typically mounted on a heatsink near the main transformer. Schottky Diodes : Located on the secondary (output) side. 2. Common Failure Points on the 101V0
: Each individual switch block relies on a dedicated trigger circuit. When a signal hits the base of the transistor, it saturates the component to activate its corresponding output line.
Power supply boards like the Wannien 101V0 contain high-voltage circuits that can be lethal. The large capacitor on the primary side can store a dangerous charge (up to 340V DC) for a long time, even after the device is unplugged. If you are looking to repair or understand
: The "101V0" designation often refers to the 94V-0 flame-retardant rating of the PCB material rather than the model number itself. Double-check the board for other labels like "PWI" or "ILPI" which might yield better search results.
. This stage high-frequency "chops" the DC to transfer energy across the isolation barrier. Output Regulation: On the secondary side, Schottky diodes filter capacitors rectify and smooth the output into standard rails (commonly JustAnswer Key Component Specifications Common Values/Types PWM Controller Regulates switching frequency Various (e.g., LD75xx series or similar) Main Filter Cap High-voltage reservoir ~100-150µF / 400-450V Secondary Caps Output ripple reduction 1000µF / 16-25V Switching MOSFET High-speed power gate Standard N-Channel Power MOSFET Common Troubleshooting & Repair
Based on repairing dozens of generic 101v0-style units, here’s what fails without needing a diagram : Power supply boards like the Wannien 101V0 contain
: Widely used in industrial automation, LCD monitor repairs, and laboratory experiments where stable, adjustable voltage is required. Typical Circuit Architecture
A: Audible noise usually indicates a failing output filter capacitor or a saturated transformer. Replace the large secondary capacitors first. If the whine persists, check the small ceramic capacitor (often 102/1nF) across the primary side snubber (RCD network).
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When repairing the Wannien 101V0, use this general component reference table for selecting replacements. Always verify the physical markings on your specific revision of the board before ordering parts. Circuit Identifier Component Type Typical Value / Spec Ceramic Fuse 2A to 3.15A / 250V (Slow-Blow) Overcurrent protection C1 Bulk Capacitor 68µF to 120µF / 400V–450V Primary DC smoothing Q1 Power MOSFET N-Channel (e.g., 7N60, 4N60) High-speed switching IC1 PWM Controller 8-pin DIP or SOP (e.g., UC3842, OB2263) Switch timing control PC1 Optocoupler PC817 / EL817 Feedback loop isolation IC2 Shunt Regulator TL431 / AZ431 (TO-92 package) Output voltage reference C_out Secondary Caps 470µF to 1000µF / 16V–25V Low-ESR output smoothing
The Wannien 101v0 power supply schematic included several key features: