The raw input voltage from the DC jack or battery.
If possible, find the "Boardview" file that matches the LQV77 schematic. While the schematic shows the logic, the Boardview shows you exactly where the components are physically located on the motherboard. lqv77 laptop schematics
An LQV77 schematic is a technical diagram illustrating the motherboard's circuit design. It maps out how components (resistors, capacitors, ICs, transistors) are interconnected, showing signal paths, power rails, and voltage levels. The raw input voltage from the DC jack or battery