Wannien 101v0 Power Supply Schematic Verified Repack 🆕 ⏰

| 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 |

Let’s dissect the critical nodes of the circuit. Use this as a roadmap when probing your dead unit. wannien 101v0 power supply schematic verified

If you have power but no backlight, check the inverter section for failed transistors or transformers. Step-by-Step Troubleshooting Safety First: | Symptom | Likely failure (from schematic) |

. It is a DIN-rail mountable or internal switching mode power supply (SMPS) commonly found in older monitor models. Visual Reference : High-resolution photos and unit descriptions available on Step-by-Step Troubleshooting Safety First:

Measure between pin 4 (GND) and pin 7 (Vcc) of the LM324. You should see between 10V and 15V DC. If this voltage is missing or oscillating, nothing else will work.

If your device is experiencing "no power" or "no display," the Wannien board is likely the culprit. Common failure points include: Blown Fuses:

If you have drawn your own schematic from a broken Wannien 101v0, use these from our verified board.