Test the main switching MOSFET for a drain-to-source short circuit.
: Steps down a 12–15V DC input to a highly regulated 5V output using a dedicated IC voltage regulator.
Replace the shorted MOSFET or rectifier diodes, check surrounding gate-drive resistors, and install a fresh fuse of the exact same rating. Symptom 2: Completely Dead Board (Fuse is NOT Blown) wannien 101v0 power supply schematic exclusive
| Step | Action | |------|--------| | 1 | – Look for IC part numbers (e.g., “3842”, “LD7575”, “OB2269”). Search datasheet of that IC → application circuit is often 90% of the schematic. | | 2 | Search more broadly – Try: Wannien 101V0 circuit diagram , Wannien power supply schematic , or search by IC + “power supply schematic”. | | 3 | Use generic repair guides – For flyback supplies, schematics from similar-rated units (e.g., 12V 8A) are highly similar. Compare with your board layout. | | 4 | Check AliExpress/B2B listings – Sometimes sellers include wiring diagrams. Reverse image search the PCB photo. | | 5 | Trace manually – If you have the unit, draw the primary side: rectifier → bulk cap → switching transistor → transformer → output rectifier. Most follow standard AN-556 or AN-4137 application notes. |
Degraded primary startup resistors or dried out low-voltage auxiliary capacitors. Test the main switching MOSFET for a drain-to-source
| If you need this for... | Do this: | |------------------------|-----------| | | Identify failed components (blown fuse, shorted MOSFET, swollen cap) and replace without full schematic. | | Understanding | Study a generic flyback converter schematic (e.g., from Mean Well S-100-12). | | Reverse engineering | Take clear photos of top & bottom of PCB, post on electronics forums (EEVblog, Badcaps). Someone may trace it for you. |
Are there any you can see on the board?
Primarily serves as the power supply and inverter driver for LCD panels. Key Technical Sections
Interpreting a schematic labeled “exclusive” If you requested an “exclusive” schematic for a Wannien 101V0, manufacturers sometimes publish simplified block diagrams rather than full detailed schematics. A practical reconstruction would show: Symptom 2: Completely Dead Board (Fuse is NOT
In the UPS version of the board, an operational amplifier monitors the output current via low‑value sense resistors (0.1 Ω) and drives the main UPS controller. This demonstrates that the same PCB can be expanded with additional components for different applications, while the core power conversion section remains unchanged.
A high-frequency transformer provides safety-critical isolation between the "hot" AC side and the "cold" DC output side. Secondary Regulation: