Repositories like the LQV77 archives and community forums are the primary sources for these documents, as manufacturers rarely release them to the general public. They are typically distributed in PDF format for easy searching of component numbers (e.g., "PU401" or "PL1").
The term is widely recognized in the tech community as a hub for advanced chip-level laptop repair training and resources.
The LQV77 board relies on specific voltage rails (like 3.3V, 5V, and CPU_CORE). The schematic tells you exactly where these voltages should be present.