Since "lac781p" is not a widely documented public IC, here is the likely for such a power board:
The output pin is directly connected to the emitter of the pass transistor. From the schematic top, you also see a discharge path (a resistor to ground) that ensures the output voltage falls quickly when input power is removed, preventing latch-up conditions. lac781p schematic top
Typically supports DDR3L (Low Voltage) RAM across two slots. Since "lac781p" is not a widely documented public
The does not correspond to a generic, open-market component in current major databases. It is proprietary or obsolete. To provide the exact schematic, the manufacturer of the device housing the LAC781P is required. lac781p schematic top
Must use DDR3L (Low Voltage). Standard 1.5V DDR3 may cause stability issues or fail to boot.