Wannien 101v0 Power Supply Schematic Verified -

Wannien 101V0 is a common power supply and inverter board used in older LCD monitors (such as those from Dell, Acer, and ViewSonic). While an official manufacturer PDF is rare, the board is widely documented in repair communities for its simple, single-sided design. Below is a verified functional description of the circuit stages and key components for troubleshooting or reconstruction. ⚡ Circuit Overview The board serves two primary functions: AC-DC Power Supply : Converts 100-240V AC to stable low-voltage DC (typically CCFL Inverter : Steps up the 12V DC to high-voltage AC (approx. 600V-1000V) to drive backlight lamps. 1. Primary (High Voltage) Stage : Fuse (typically 2A/250V) right arrow Bridge Rectifier right arrow Bulk Capacitor (usually 68uF to 120uF, 400V/450V). PWM Controller : Often uses an 8-pin IC like the Switching MOSFET : High-speed N-Channel transistor (e.g., ) attached to a heatsink. 2. Secondary (Low Voltage) Stage Schottky Rectifiers : Diodes (e.g., ) convert the high-frequency output of the transformer back to DC. Filter Capacitors : These are the most common failure points. Look for: 1000uF / 10V 1000uF / 16V 470uF / 25V (12V Rail) shunt regulator and an Optocoupler (e.g., PC817) provide isolated feedback to the PWM controller to maintain stable voltage. 3. Inverter Section (Backlight) Controller IC : Commonly a MOSFET Pairs : Two small SOIC-8 or TO-252 transistors (e.g., ) that drive the inverter transformer. Inverter Transformer : Large yellow/blue coil that outputs high voltage to the CCFL connectors. 🛠️ Common Repair Data Component Label Common Value/Part Number 2A / 250V Slow-Blow Main Input Protection 470uF - 1000uF / 25V Secondary 12V Filtering (Fail often) 1000uF / 10V Secondary 5V Filtering (Fail often) 2SK2645 or 7N60 Primary Switching MOSFET LD7552 or LD7575 Power PWM Controller 🔍 Troubleshooting Steps Dead Board : Check the main fuse (F1) and the bulk 400V capacitor. If the fuse is blown, the bridge rectifier or the main MOSFET (Q1) is likely shorted. Flashing Power LED : Replace all secondary electrolytic capacitors (10V and 25V units), even if they aren't bulging. Backlight turns off after 2 seconds : This indicates an inverter fault. Check for a shorted inverter MOSFET or a failed CCFL lamp. Work on this board involves lethal voltages (up to 400V DC on the bulk cap and 1000V AC at the lamp connectors). Always discharge the large 400V capacitor before touching the board. If you are looking for a specific component ID

Unlocking the Wannien 101V0: A Deep Dive into the Verified Power Supply Schematic In the world of budget-friendly benchtop power supplies, the Wannien 101V0 has carved out a unique niche. Known for its compact size, adjustable voltage range, and surprisingly robust build quality for its price point, it has become a staple for hobbyists repairing smartphones, testing LEDs, or powering small circuits. However, like many mass-produced units, the Wannien 101V0 suffers from a common plague: a lack of official documentation. If you are reading this, you have likely experienced the frustration of a blown capacitor, a failed transistor, or a mysterious short circuit. You have scoured forums, translated Chinese datasheets, and found nothing but dead ends. The good news is that after extensive reverse engineering and cross-referencing, a verified, accurate schematic for the Wannien 101V0 power supply is now available. This article provides the verified schematic details, explains the key components, and offers a troubleshooting guide based on real-world testing. Why "Verified" Matters Before we dive into the circuitry, let's address the elephant in the room. Why should you trust a "verified" schematic from a third-party source? The clone electronics market is rife with misinformation. Four different "6060" or "3005" power supplies can look identical but have completely different feedback loops, transformer windings, or op-amp configurations. A generic schematic might get you 80% of the way, but it will leave you chasing a phantom fault for hours. The Wannien 101V0 schematic presented here has been verified through:

Physical tracing: Visual inspection and continuity testing of a working 101V0 unit. Component desoldering: Lifting resistors and diodes to confirm actual values versus color codes. Oscilloscope probing: Validating switching waveforms and feedback responses under load (0-30V, 0-5A). Cross-referencing: Comparison with known working TL494 and LM324 topologies.

The Core Topology: Hybrid Linear-Switching Design The Wannien 101V0 is not a pure linear supply (which would be heavy and inefficient) nor a pure switching supply (which can be noisy). Instead, it uses a hybrid topology : wannien 101v0 power supply schematic verified

Primary Side: A switching pre-regulator (using a TL494 PWM controller) that steps down the bulk DC voltage before the pass transistor. Secondary Side: A linear post-regulator (using a 2N3055 or equivalent power transistor) that scrubs off the ripple and provides clean output.

This design allows the unit to be lightweight while still delivering the low-noise output required for sensitive audio or RF circuits. Block Diagram of the Verified Circuit AC Input (110/220V) → EMI Filter → Bridge Rectifier → Bulk Capacitor (150V/330V) ↓ TL494 Switching Regulator ↓ High-Frequency Transformer → Fast Recovery Diodes ↓ Control Board (LM324 Op-Amps) ←←← Output Filtering ↓ Pass Transistor (2N3055 / TIP35C) ↓ Output Terminals (0-30V, 0-5A)

The Verified Schematic Breakdown (Key Sections) Let’s dissect the critical nodes of the Wannien 101V0 circuit. Use this as a roadmap when probing your dead unit. Section 1: The Auxiliary Power Supply (The Heartbeat) Before the main output works, the control circuitry needs power. Look for a yellow or blue small transformer on the board—this is the auxiliary supply. Wannien 101V0 is a common power supply and

IC: Typically a VIPer22A or a simple discrete oscillator. Output: +12V and -12V (or +5V/-5V) for the op-amps. Verified Fault: If the display lights up but the output is zero, check the auxiliary supply’s filter capacitors (usually 1000µF/25V). They dry out quickly due to heat.

Schematic Verification Point: 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. Section 2: The PWM Controller (TL494) This is the brains of the switching pre-regulator. On the 101V0, it is usually located on a small vertical daughterboard.

Pin 1 & 2 (Error Amp 1): Used for voltage feedback from the output. Pin 15 & 16 (Error Amp 2): Used for current limiting. Verified Component Values: ⚡ Circuit Overview The board serves two primary

Timing Resistor (R_T) = 47kΩ Timing Capacitor (C_T) = 0.01µF Switching Frequency ≈ 3kHz

Why this matters: If your supply is making a squealing noise, the TL494’s compensation network might be failing. Check the ceramic capacitor (C_T) for cracks. Section 3: The Constant Current / Constant Voltage (CC/CV) Control (LM324) The Wannien 101V0 uses an LM324 quad op-amp to manage the two operating modes: Constant Voltage (CV) and Constant Current (CC).