PDF schematic in a 2.16 MB RAR archive for board 14238-1, a number following the Wistron pattern. No brand, model or revision letter is mentioned in the name, so the PCB marking is the only way to confirm a match. Technicians use such a schematic to trace power rails from the charger circuit to the CPU regulators, check signal paths between the chipset and peripherals and read resistor or capacitor values. Pair it with a boardview of the same number for physical part locations.
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 @cyberlanelectonik. 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.