Wannien (often associated with Tenma and other rebranders) manufactures budget electronics. Unlike big names like Rigol or Tektronix, service manuals for these units are not typically hosted on public FTP servers or official websites.
If you are looking for a free schematic, your best bet is to look for clones. In the world of cheap electronics, the casing might change, but the internal PCB is often identical across several brands.
Look for an 8-pin DIP or SOT-23-6 chip near the MOSFET.
Without the schematic, repairing a switching power supply is like performing brain surgery blindfolded. The Wannien 101V0 is not a complex unit, but it contains specific components: wannien 101v0 power supply schematic free
Paid schematic services charge anywhere from $5 to $30 per diagram. For a power supply that might cost $15 new, that doesn’t make economic sense. Hence, the demand for a free schematic is huge among hobbyists, repair shop owners, and IT technicians.
Knowing the schematic is half the battle. Here is what usually breaks on this unit:
When you press "Power On" on the remote: Wannien (often associated with Tenma and other rebranders)
Use a free tool like Falstad’s Circuit Simulator or even pen and paper. Once drawn, you have your own "free" schematic.
Yes, absolutely. While you cannot get a branded "Wannien" official PDF for free (unless a previous owner scanned it and uploaded it to a forum), you can get the functional equivalent for free. The laws of physics are open source.
Your action plan:
Within 20 minutes, you will have reverse-engineered the schematic. This is not just "getting the schematic for free"—it is becoming the engineer who writes the schematic.
Disclaimer: This article is for educational and repair purposes. Always discharge high-voltage capacitors and use isolation transformers when repairing linear power supplies. If you are unsure about working with mains voltage, consult a professional.