Laptop motherboard schematic, 4.19 MB PDF, for Wistron board number 14279-1; the name gives no model, platform or revision beyond that. Wistron is a Taiwanese ODM whose five-digit numbers with a dash suffix appear on many Dell notebook PCBs. Open the file in a PDF reader and search net names to follow power rails, trace charger and EC signals and locate components for testing. Check the cover page for the revision and make sure the board in hand carries the same number before using values.
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 @one5technology. 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.