Boardview for a Quanta motherboard numbered DABY3CMB8E0, pointing to the BY3 project family under Quanta naming, supplied as a 1.06 MB RAR archive. The name states no brand or laptop model. Quanta prints this DA-style number on the PCB, so match it exactly, including the trailing revision characters. Once extracted the file opens in a boardview viewer, where you can search designators, follow nets pin by pin and locate test points while chasing missing voltages or shorts.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @alischematics. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.