Usually powered by operational amplifiers (such as the LM741, TL082, or LM324).
What are you currently seeing on the board? Are any components visibly burned or damaged ?
The best place to find help is on electronics repair forums. Websites like Badcaps.net , Rom.by , Eletronicabr.com , and Plcforum.it have discussions related to this board.
Check for ~310V DC (on 220V AC input). If voltage is missing, trace the circuit between the AC input and the capacitor to find an open trace, bad NTC thermistor, or failed bridge rectifier.
In the heart of a bustling city, there was a small, mysterious shop known as "Wannien's Workshop." The store was famous for its enigmatic owner, Mr. Wannien, who was a genius in crafting innovative electronic devices. Among his creations was a highly sought-after power supply unit known as the "Wannien 101V0." wannien 101v0 power supply schematic free
The 101V0 is recognized for its robust, albeit dated, construction. It utilizes a PCB, which is a standard requirement for safety in industrial environments to prevent fire spread in case of component failure.
Typically dual or triple output (e.g., 5V DC for logic boards, 12V or 24V DC for backlights/amplifiers)
Always replace secondary filtering capacitors with Low-ESR variants rated for 105°C. Standard capacitors will fail prematurely due to high-frequency stress.
: Usually includes glass or ceramic fuses (e.g., T3.15A) and transient suppressors. JustAnswer Common Issues & Troubleshooting Usually powered by operational amplifiers (such as the
If your device is dead, blinking, or making a clicking sound, follow these step-by-step diagnostic procedures.
If you have a damaged board, you can draft your own schematic fragment:
The Wannien 101v0 is not a unique design. It is a clone of a very famous topology. 90% of these Chinese linear supplies are derivatives of the Kepco or HP (Hewlett Packard) designs from the 1970s, filtered through the LM723 application note.
[AC Input] ──> [EMI Filter] ──> [Bridge Rectifier] ──> [PWM Controller & MOSFET] │ [DC Output] <── [Rectifier & Filter] <── [Transformer] <───────┘ │ │ └──> [Optocoupler Feedback Loop] ─────────┘ The Primary (Hot) Side The best place to find help is on electronics repair forums
Use a free tool like or even pen and paper. Once drawn, you have your own "free" schematic.
Use specific search strings on these platforms:
When a MOSFET shorts, it often destroys the current-sense resistor connected to its source, and sends a voltage spike back into the gate pin, destroying the PWM controller IC. 2. Bad Electrolytic Capacitors ("Bad Caps")