A network of precision resistors, capacitors, and helper ICs ensure stable triggering signals without voltage sagging. Step-by-Step Troubleshooting with the Verified Schematic
The isolated, low-voltage AC high-frequency pulses from the transformer must be processed back into usable DC.
A verified schematic for the 101V0 consistently shows the AC input flowing through a standard safety fuse (F1). Technicians verifying this section should check the schematic against the PCB for the presence of an NTC thermistor (TH1), used to limit inrush current.
Connect a high-power load or short the terminals through a reliable 10A ammeter. Turn the current knob up slightly and adjust the current calibration trimpot until the front panel display matches the external ammeter exactly.
Check the output pin of the voltage regulator to ensure a stable 5V is being produced. wannien 101v0 power supply schematic verified
Dried out or bulging secondary electrolytic filter capacitors.
This guide assumes you have basic electronics knowledge (reading schematics, using a multimeter, soldering). The Wannien 101V0 is a common found in many LED drivers, small appliance chargers, and industrial control units.
In the absence of a schematic, repair knowledge has been crowdsourced through the hard-won experience of technicians who have repaired these boards. The most commonly reported failures include:
The schematic heavily relies on standard dual or quad op-amps, most commonly the LM358 or UA741 . A network of precision resistors, capacitors, and helper
Troubleshooting the Wannien 101V0 Power Supply: A Quick Guide Finding a verified schematic for the Wannien 101V0 (often labeled as or associated with the
| Reference | Component | Value/Rating | Verification Notes | | :--- | :--- | :--- | :--- | | | Fuse | 5A / 250V (Slow Blow) | Verified by physical removal | | RV1 | Varistor | 14D471K | Confirmed clamping voltage | | IC1 | PWM Controller | LD7750R (SOP-8) | Pin 5 (GND), Pin 8 (HV) | | Q1 | MOSFET | SVD11N60T | Rds(on) 0.39 Ohm max | | T1 | Transformer | EE28-101V0 | Primary: 42T, Aux: 7T, Sec: 9T | | D8 | Output Diode | MBRF20100CT | Common cathode | | R17 | Current sense | 0.22 Ohm / 2W | Metal film, verified tolerance |
What is your power supply displaying? (e.g., completely dead, stuck at max voltage, clicking relays)
The board accepts an primary unconditioned voltage input (typically in the on generic versions, or standard AC grid voltages on full inverter board variants). Check the output pin of the voltage regulator
For search engines and repair techs using OCR, here is the critical schematic data for the Wannien 101v0. (Copy this to a text file or KiCad).
To explore sourcing physical replacement boards, check out the product listings on industrial equipment databases like Paragon Tech or review full circuit layouts on digital document archives such as Scribd's Wannien Schematic Page .
If a failed factory capacitor was rated for 16V, replace it with a 25V capacitor of identical capacitance, provided it physically fits on the circuit board layout.
Measure across to ensure you have a clean ~310V DC bus (on 230V AC mains). Measure the VCCcap V sub cap C cap C end-sub