Wannien 101v0 Power Supply Schematic Free ((hot)) -
: Frequently found in LCD monitors (like the Wan Nien 101VO series), industrial DIN rail systems, and some ATX power supply platforms.
The heart of the 101v0 is almost certainly the voltage regulator IC. Download the official Texas Instruments LM723 datasheet (free). Look for the "High Voltage, High Current Power Supply" or "Low Voltage, High Current" application circuit.
If you find a shorted MOSFET, replace it along with the driving PWM controller, as a failed MOSFET almost always sends a high-voltage spike back into the PWM control pin, destroying the chip internally. Step 3: Measuring the Primary DC Voltage
It utilizes four distinct transistor switch circuits (often labeled out1 through out4 ) to control output loads. wannien 101v0 power supply schematic free
If you cannot find a schematic for "Wannien," search for or "Zhaoxin PS-305D schematic" . You will likely find that the transformer pinouts, voltage regulation chips, and capacitor placements are identical.
A failing optocoupler breaks the communication loop, causing the PWM controller to output incorrect or unstable voltages.
Once started, the PWM IC relies on an auxiliary winding on the transformer for continuous power. Check the diode and small electrolytic capacitor connected to this winding. Symptom 3: Output Voltage Fluctuating or "Hiccup Mode" : Frequently found in LCD monitors (like the
If you are tracing the circuit without a full schematic, focus on these critical components usually found on the 101V0 board: PWM Controller: Often an IC like the or similar, which drives the switching MOSFET. Filter Capacitors:
Disclaimer: This article is for educational and repair purposes. Always discharge high-voltage capacitors and use isolation transformers when repairing linear power supplies. If you are unsure about working with mains voltage, consult a professional.
Check for a short circuit between the Drain (D) and Source (S) pins. A shorted MOSFET is the most common reason for a blown main fuse. Look for the "High Voltage, High Current Power
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The Wannien 101V0 is a Switch-Mode Power Supply (SMPS). Unlike older, heavy linear power supplies that use massive transformers to step down voltage, an SMPS utilizes high-frequency switching to achieve high efficiency in a compact, lightweight form factor.