The LQV77 schematic will detail the charging IC (often a BQ-series chip). This section is vital if the laptop works on battery but won't charge, or if it won't power on via the AC adapter. Tips for Using Schematics Safely
If the power button is pressed but nothing happens, the schematic helps you trace the "Power On" signal from the button to the Super I/O chip. lqv77 laptop schematics
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. The LQV77 schematic will detail the charging IC