If you cannot find the exact board schematic, look at the part numbers of the PWM Controller IC (e.g., UC3842, NCP1200, or TOP244). Look up the "Application Note" or "Datasheet Reference Design" for that specific IC. Manufacturers like Wannien closely follow these reference designs, meaning the schematic in the IC datasheet will be functionally identical to your board.
The board is fundamentally split into two main sections, clearly demarcated by a thick white line (the isolation barrier) printed on the circuit board: 1. The Primary (Hot) Side
Working on switch-mode power supplies carries inherent risks of severe electrical shock.
| Variant Name | Found In / Part Numbers | Key Details | | :--- | :--- | :--- | | | ASUS EXA1202YH laptop charger | Board code: ADA19470YB10 | | WANNIEN 101VO (94VO) | Lenovo M series PC power supply | Manufacturer: LITEON / Model: PS-5241-01VA | | WAN NIEN 101V0 | LYONN DESIRE-500 UPS | Board used for charge sensing circuit | | Wannen Delta 101v0 (94v0) | Generic laptop power supply | Often associated with Delta Electronics |
Because these boards follow reference designs, searching for the schematic of the primary PWM IC (e.g., "SG6841 schematic pdf" or "LD7575 repair manual") will often give you a circuit diagram that is 95% identical to the Wannien layout. wannien 101v0 power supply schematic free
Scorched areas or discoloration on the PCB around the MOSFET, diodes, and power resistors.
If you are reading this, you likely have a dusty Wannien 101v0 bench power supply sitting on your workbench—either non-functional or in the middle of a repair project. Alternatively, you might be a hobbyist looking to reverse-engineer this classic, budget-friendly linear power supply for a custom build.
When the 101V0 board fails, it usually results in a "no power" or "no display" (dark screen) symptom. Wan Nien 101V0 Power Supply Schematic - Expert Q&A
Spray electronic contact cleaner into the voltage/current adjustment potentiometers and rotate them repeatedly. Inspect filter capacitors for bulging tops. Crucial Safety Precautions If you cannot find the exact board schematic,
Check the main fuse near the AC input. If it’s blown, test the bridge rectifier and the switching MOSFET for shorts. "Two Seconds to Black" (Backlight Issue):
Comprehensive Troubleshooting Guide and Schematic Analysis for the Wannien 101V0 Power Supply
: This is your best bet. Create a free account on Badcaps.net . After your account is active, go to the user profile of "pronet". You can find them here: https://www.badcaps.net/member/57069-pronet . Send them a polite, clear email (as requested in their profile) explaining that you are working on a Wannien 101v0 power supply and would be very grateful if they could share the PDF schematic they created.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. The board is fundamentally split into two main
Secondary regulator (3.3 V):
The Wannien 101V0 is a standard switched-mode power supply (SMPS). It converts high-voltage alternating current (AC) from a wall outlet into stable, low-voltage direct current (DC) required by sensitive digital logic circuits. The board is divided into two distinct regions separated by an isolation barrier: the primary (hot) side and the secondary (cold) side. 1. AC Input and EMI Filtering (Hot Side)
This is the most common issue in Wannien boards that have been in service for several years.
The Wannien 101V0 power supply is a high-reliability, high-performance unit designed to provide a stable output voltage. Its features may include:
