Wistron schematic for project 18796, revision A00, where the SC suffix most likely stands for schematic. The name does not say which laptop brand or model uses this board, so check the cover page of the PDF for the platform and product details. Wistron designs boards for Dell, Lenovo, Acer and other brands, and its five-digit codes identify the project. Use the document to trace power rails and signals and to find parts by reference designator, after confirming the number printed on your PCB.
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 @vinafix_bios. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.