If you’ve landed here, you are likely staring at a dead power supply. Maybe it’s from a LED sign, a CCTV camera bank, or a 3D printer. The bad news? Official schematics for the "Wannien" brand are almost impossible to find. The good news? The 101V0 is almost certainly a clone of a very common topology.
If it just has bulging caps or a blown fuse: Use the TL494 reference design from the Texas Instruments datasheet as your schematic. Every pin on that IC will match your Wannien board. wannien 101v0 power supply schematic
Drop it in the comments. If you show me the top and bottom of the PCB, I can point you to the exact resistor values. If you’ve landed here, you are likely staring