Some old electronics repair websites from the 2000s have closed down, but their schematic PDFs live on at archive.org. Try searching: "Wannien 101V0" filetype:pdf.
If you are probing inside a power supply, remember that switching power supplies contain mains voltage.
A 15V or 18V zener diode across the VCC pin of the PWM IC can short. On the schematic, it is often labelled "ZD1." wannien 101v0 power supply schematic free
Since you likely won't find a PDF schematic, use this failure guide to identify components visually:
Switching power supplies use bleed resistors. If one of these has gone open circuit (high resistance), the supply may fail to start or produce incorrect readings. Some old electronics repair websites from the 2000s
Let’s get straight to the point. This schematic is not readily available on official Wannien websites (they rarely publish them). However, the DIY repair community has preserved it. Here are the top sources to download it for free:
Note: I could not verify an exact product named “Wannien 101V0”; I’ll assume you mean a small PCB/system using a 5–12 V DC input (common for hobby boards). Below is a general, safe, and practical power‑supply schematic and explanation you can adapt for a small electronics board labeled “101V0.” Treat this as a template — verify component ratings and pinouts against your actual board. A 15V or 18V zener diode across the
Before diving into the technical details, it is important to address the request for a "free schematic."
The Wannian (万年) brand is typically a Chinese OEM (Original Equipment Manufacturer) that produces budget electronics, often rebranded or sold as generic LED TV mainboards. Unlike major brands (Samsung, Sony, LG), these manufacturers do not publicly release service manuals. Finding a 100% accurate, factory-issued schematic diagram for free on the internet for a specific revision like "101V0" is highly unlikely.
However, you do not need a specific factory schematic to repair this board. These power supplies are built using standard topologies. If you understand the generic "LED TV Power Supply Architecture," you can read the board without a diagram.