Buzzing noise from transformer, intermittent shut-downs, 5V rail at 4.2V. The Fix: Replace C4 (Primary side 150µF/450V) and all secondary side low-voltage caps (1000µF/35V). Do not skip the small 47µF/50V cap near the PWM IC; it runs the VCC.
Searches indicate the schematic is available in documents listed under "95656452-c2bd-413d-a9f9-aacc00c1cc34-drvpowersupplyschematic".
The schematic for the Wannien 101V0 is frequently sought through electronic repair forums and document repositories.
Remove the four corner screws. Lift the PCB. Look for: wannien 101v0 power supply schematic repack
Original components from the board’s production era may be obsolete, but you can find vintage replacements or drop-in pulls through platforms like eBay.
If you are working from a schematic repack, focus your multimeter testing on these high-probability failure areas: Visual Inspection
Disclaimer: Working with AC mains voltage is dangerous. Ensure you are familiar with electrical safety guidelines before designing or repairing power supply circuits. If you'd like, I can: Searches indicate the schematic is available in documents
A: Yes, but pinout varies. The Mean Well RD-125A has a similar 24V/5V output. You will need to repack (re-wire) the terminal block adapter.
These boards have also been found as the driving engine in generic switching power supplies intended for general electronics repair, robotics, and embedded systems.
Weeks later he found the stamped envelope on the archive shelf, half-buried among datasheets and obsolete manuals. Someone had cataloged it as “modified.” The entry included Leroux's original mark and his own, layered like palimpsest ink. The archivist, a woman with an amused habit of tightening glasses more than necessary, shrugged at his annotation and said, “People fix things. We keep the evidence.” Lift the PCB
: Look for the main switching transistor (Q01) and the PWM controller IC. Inverter Section
If your monitor exhibits these symptoms, the 101V0 power supply is a likely culprit:
: The base voltage must transition cleanly between low (0V) and high (typically 3.3V or 5V) states. If the trigger signal arrives but the corresponding output pin ( out1 - out4 ) fails to drop or raise its load voltage, the transistor is open or shorted. The "Repack" Strategy: Upgrading and Recapping the Board
): These can fail if the supply overheats. Check the output pins for 12V12 cap V 15V15 cap V 4. Upgrading the Wannien 101V0 (Mods) A "repack" isn't just for repair; it's for improvement.