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What the board is showing (e.g., completely dead, blinking LED, clicking noise)? The exact output voltages printed on the PCB silk screen?
AC Input (110/220V) → EMI Filter → Bridge Rectifier → Bulk Capacitor (150V/330V) ↓ TL494 Switching Regulator ↓ High-Frequency Transformer → Fast Recovery Diodes ↓ Control Board (LM324 Op-Amps) ←←← Output Filtering ↓ Pass Transistor (2N3055 / TIP35C) ↓ Output Terminals (0-30V, 0-5A)
A PWM (Pulse Width Modulation) controller chip drives a MOSFET to "switch" the DC voltage across a transformer at high frequencies.
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. wannien 101v0 power supply schematic verified
: It converts AC mains voltage into various DC rails, typically providing outputs like +5V for logic and +12V or +24V for the inverter stage.
The PWM IC rapidly switches the MOSFET on and off, collapsing and expanding the magnetic field inside the high-frequency transformer. This induces a voltage in the secondary windings. High-speed Schottky diodes rectify this high-frequency AC back into DC, which is then smoothed by low-ESR (Equivalent Series Resistance) electrolytic capacitors and small toroidal inductors (Pi-filters). Feedback and Regulation Loop
Look for bloated or leaked capacitors. Measure the input to the 5V regulator. Backlight Flashes and Dies: What the board is showing (e
This section controls the energy transfer across the isolation barrier.
At 4:30 AM, he plugged in a spare hard drive as a dummy load.
A verified schematic for the 101V0 consistently shows the AC input flowing through a standard safety fuse (F1). Technicians verifying this section should check the schematic against the PCB for the presence of an NTC thermistor (TH1), used to limit inrush current. This public link is valid for 7 days
: A defining layout feature of the verified Wannien 101v0 circuit diagram is its four independent transistor switch channels (designated as OUT1 through OUT4 ).
Incorrect schematics show a 1.5M or 2M resistor from bulk capacitor to IC pin 8. 4.7M Ohms (Yellow, Purple, Green, Gold). Why it matters: Using a 2M resistor will overheat the LD7750R at 240VAC. Using a 10M will fail to start below 100VAC.
When troubleshooting, the allows you to trace the voltage from the input to the output, identifying where the signal breaks.
The cornerstone of the 101v0 board is its buck-regulation circuit. The schematic details an architectural flow that takes a and steps it down using an Integrated Circuit (IC) voltage regulator to a highly stable 5V output rail . This 5V line acts as the lifeblood for the microprocessor and digital processing elements of the connected device. 2. Multi-Channel Transistor Switching Matrix
