If you only need the controller:
If you have the schematic (PDF, image, or paper copy), here’s how to approach for a board like the BDL51 / LAD711P Rev 30: bdl51 lad711p rev 30 schematic work
The standby IC (often RT8243A ) generates always-on voltages like +3VLP and +5V LDO . If you only need the controller: If you