Schematic PDF of 5.13 MB for board 19717-1, a number following the Wistron five-digit-dash-revision pattern. The file name states no laptop brand or model, so identify the target device from the title block inside. Wistron builds boards for brands such as Dell, Acer and Lenovo. It opens directly in any PDF reader and is used to trace power rails, follow signal paths and locate components linked to a short or missing voltage. Check that the number and revision on the PCB match before relying on it.
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 @ITHINKHS. 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.