Wannien 101v0 Power Supply Schematic Repack !!top!! Review

: Look for burnt resistors, leaking electrolyte, or cold solder joints.

This board comes with various letter suffix revisions, with “101v0” being the most common and widely produced. The power supply is known for being robust, easily repairable, and a standard component in the construction of electronics from the 2010s.

Because the Wannien 101V0 is a generic board, a failure in one device can offer clues for another. For instance, a technician repairing a UPS found that the feedback circuit resistors (R13, R89, R80) were burnt. After failing to find a schematic online, they disassembled a different but similarly sized UPS from the same brand. They found the identical Wannien 101V0 board. By comparing the components, they discovered that the burnt SMD resistor, R13, had a marking of "01C", which identified it as a 10k Ohm resistor. wannien 101v0 power supply schematic repack

Isolated design ensures safety, separating the high-voltage mains from the low-voltage output. Size: Extremely compact footprint, often around

: Measure the voltage across the ground and the output pins of the primary IC regulator. If it reads 0V despite getting input voltage, the regulator IC has suffered a hard failure and must be desoldered. Symptom: Blinking Standby Light or "No Display" : Look for burnt resistors, leaking electrolyte, or

Remember: Safety first. The 340V DC bus on the primary capacitor can hold a lethal charge for hours. Always discharge C4 with a 10kΩ 5W resistor before probing.

: Usually caused by a short in the bridge rectifier or switching MOSFET. Solder Joint Fatigue Because the Wannien 101V0 is a generic board,

Often points to faulty electrolytic capacitors on the 101V0 board.

| Section | Components | Function | | :--- | :--- | :--- | | | L1 (Common mode choke), C1, C2 | Suppresses noise back to the mains. | | Rectification | D1-D4 (GBU806) or equivalent bridge rectifier | Converts 110-240V AC to 300-340V DC. | | Primary Switching | Q1 (MOSFET – often 10N60), U1 (PWM IC) | Converts DC to high-frequency AC (40-100 kHz). | | Transformer | T1 (EFD30 or EQ30 core) | Isolates primary from secondary. | | Secondary Rect. | D5 (24V Schottky), D6 (5V Schottky) | Converts HF AC back to DC. | | Feedback | U2 (TL431), U3 (PC817 optocoupler) | Regulates the output voltage. |

If your custom setup or repack does not actively use a split-rail voltage reference or a manual 115V/230V voltage selector circuit, leaving this node floating or miswiring it directly to chassis ground will distort the primary switching balance, causing clicking noises or triggering overcurrent protection under heavy loads. Critical Component Matching for the Repack