Test the main switching MOSFET pins (Drain to Source) for a dead short.
Alex was taken aback but decided to take Mr. Wannien up on his offer. Over the next few months, Alex learned the intricacies of power supply design, and Mr. Wannien shared with him the art of innovation and problem-solving.
If the power supply is completely dead with a blown main fuse, the switching MOSFET or the combined PWM/MOSFET IC has likely suffered a short circuit. When these components fail, they short the high-voltage DC rail directly to ground, immediately destroying the input fuse to prevent a fire. Failed Secondary Schottky Diodes wannien 101v0 power supply schematic free
If it reads open loop (OL), you have a short circuit downstream.
Because the Wannien 101V0 is a generic power board layout, exact factory replacement parts are not strictly necessary as long as specification parameters are met or exceeded: Test the main switching MOSFET pins (Drain to
Set your DMM back to Continuity mode. Place the black probe on a secondary ground pad (usually the metal shield of an output connector or a dedicated ground pin). Touch the red probe to the cathode (the side with the stripe) of each secondary rectifier diode.
Check the optocoupler and the TL431 regulator. If the feedback path is open, the controller will continuously ramp up the voltage until it hits its maximum threshold and shuts down safely. Component Care and Preventive Maintenance Over the next few months, Alex learned the
After the primary side is working, check the output.
Finding a free, high-resolution schematic for specific hardware like the (often associated with model E88653) can be challenging because these diagrams are frequently proprietary or internal engineering documents. However, understanding the core architecture of this power supply board is essential for repairing issues like "no power" or "no display" in devices like LCD monitors. Understanding the Wannien 101V0 Power Supply
: Features a fuse, thermistor (e.g., TH101), and EMI filters to prevent electrical noise from entering the mains. Rectification & PWM Stage