Wx-dc12003 Schematic

VOUT+ --- R1 (3.3kΩ) --- FB (pin4) FB (pin4) --- R2 (1kΩ) --- GND

Usually caused by a shorted bridge rectifier or a failed switching MOSFET. wx-dc12003 schematic

Node 7-B was a small capacitor loop, drawn incorrectly on the official schematic. Someone had fixed it in pencil — then erased it. VOUT+ --- R1 (3