, the most common failure points on this specific schematic involve the secondary filter capacitors blown fuses
The large 400V+ capacitor on the primary side can hold a lethal charge long after the AC cord is unplugged. Always use a high-wattage power resistor (e.g.,
the board was pulled from (e.g., specific older Acer or ViewSonic models) rather than just the board number. Reputable sources for these documents include: Wan Nien 101V0 Power Supply Schematic - Expert Q&A
While many guessed it used a UC3842, the exclusive schematic reveals a (identical to TL494). This is a pulse-width modulation controller running in push-pull mode.
100V – 240V AC (Universal Wide-Input) Input Frequency: 50Hz / 60Hz wannien 101v0 power supply schematic exclusive
| | Known Value / Observation | Source | |---|---|---| | Fuse | T3.15A 5A | ASUS EXA1202YH repair | | X2 Capacitor | 0.33 µF | ASUS EXA1202YH repair | | Main Electrolytic Capacitor | 120 µF 450 V (replacement stable at 122 µF) | ASUS EXA1202YH repair | | Output Diodes | PK MUR 460 | Russian repair log | | SMD resistor R13 (UPS version) | 01C = 10 kΩ | LYONN UPS repair | | Sense resistors R89, R80 (UPS version) | 0.1 Ω, 3 W | LYONN UPS repair | | Load sensing op‑amp (UPS) | LM324 | LYONN UPS repair | | Board flame‑retardancy rating | 94V0 | PS2 Slim power supply |
Let me know which would be most helpful for your project.
Replace any open startup resistors. If VCC is present at the IC but no switching occurs, replace the PWM IC. Symptom 3: Ticking, Clicking, or Hiccup Mode
The control circuit regulates the output voltage by monitoring the output voltage and adjusting the switching frequency of the power MOSFET (Q1). The error amplifier (U2) and PWM circuit work together to ensure a stable output voltage. , the most common failure points on this
To help you pinpoint specific issues with your board, what is your Wannien 101V0 displaying right now (e.g., completely dead, blinking light, or incorrect output voltage)? Alternatively, Share public link
Power supplies are the unsung heroes of electronic devices. When a specialized piece of equipment fails, the culprit is almost always the power supply unit (PSU). Among various proprietary bench and industrial power supplies, the is highly regarded for its efficiency, but notoriously difficult to service without proper documentation .
What or multi-meter measurements are you currently getting?
The Wannier 101v0 power supply operates on the principles of switching power supplies. The power supply uses a high-frequency switching circuit to convert the input voltage to a high-frequency AC voltage. The AC voltage is then transformed, rectified, and filtered to produce a stable DC output voltage. This is a pulse-width modulation controller running in
Once filtered, the AC voltage must be converted into high-voltage DC.
typically operates as a , converting AC input into regulated DC outputs. Key Circuit Sections : Power Supply Board : Handles primary AC-to-DC conversion.
The stock unit uses a 12V fan connected directly to the 24V rail via a dropping resistor (R60, 150 ohms). This burns out the fan quickly.
[Insert actual schematic diagram here, or describe it]
If you are using the schematic to troubleshoot a "no power" or "flickering" issue, prioritize these areas: Capacitor Failure:
