Wannien 101v0 Power Supply Schematic Verified Jun 2026

part number) is a common hurdle for monitor and electronics repair enthusiasts. This power supply board is frequently found in various LCD monitors and typically handles the AC-to-DC conversion and inverter duties for the display backlight. Common Issues and Symptoms

The (often identified as model Go to product viewer dialog for this item. wannien 101v0 power supply schematic verified

Electrolytic capacitors are the most frequent failure point in Wannien units. Look for bulging tops or leaking fluid. part number) is a common hurdle for monitor

| Symptom | Likely failure (from schematic) | Test point | |-----------------------------|-----------------------------------------------------|------------------------------------| | No output, fuse intact | Startup resistor open, or IC1 dead | Voltage at IC1 pin 7 (should rise) | | Output voltage jumps / unstable | TL431 divider resistors drifted, optocoupler weak | Output divider junction (~2.5V) | | Output low (e.g., 8V instead of 12V) | Secondary filter capacitor high ESR, or feedback loop broken | Check C2, C3 with ESR meter | | Squealing noise + no output | Transformer shorted turns, or output short circuit | Resistance across secondary winding | | Blows fuse immediately | Bridge rectifier shorted, MOSFET shorted D‑S, bulk capacitor shorted | Diode test on D1–D4, MOSFET | Electrolytic capacitors are the most frequent failure point

The Wannien 101V0 uses an to manage the two operating modes: Constant Voltage (CV) and Constant Current (CC).

the exact feedback loop parameters to ensure rock-solid voltage stability.