In laptop schematics, abbreviations like "APW" typically designate specialized power ICs, dual MOSFETs, or linear regulators often manufactured by Anpec Electronics (APW series) or used as layout designators for Advanced Power Waveforms. Primary Power Rail Breakdown
If a low-resistance short to ground is detected on the output rail of the APW70: apw70 lac391p schematic portable
Schematic and Boardview files (usually in .pdf or .brd format) are essential for tracing signals like PWR_SW# or AD+ . You can often find them on specialized technician forums: In laptop schematics