Lac781p Schematic Top

+-----------------+ | | AC IN ~ | | | [Bridge Rectifier] | | | +-------+---------+ | C1 + (Large Electrolytic, e.g., 2200µF/25V) | +-----> Vin (LAC781P Pin 1) | GND ---+-----> GND (LAC781P Pin 2) | +-----> Common Ground Vout (LAC781P Pin 3) ---> +12V Output | C2 + (Electrolytic, 100µF/16V) | C3 + (Ceramic, 0.1µF) | GND

Some also include a reverse protection diode (1N4001) from Vout to Vin, and a small LED + resistor on the output as a power indicator. lac781p schematic top

Search for the exact device model this board came from (e.g., "LAC781P Dell monitor power supply" or the chassis number). The "top" block is standardized for flyback topologies, but component values vary. +-----------------+ | | AC IN ~ | |