Dell Latitude 5300 laptop boardview identified by board number 18828-1, a pattern matching Wistron, which builds many Dell business notebooks. The file is a .cad layout of about 3.87 MB, openable in boardview software such as FlexBV, OpenBoardView or Boardviewer. It lets a technician find components, see which nets connect to each pin and locate test points when diagnosing no-power, charging or short-circuit faults. Check that the number printed on the motherboard is 18828-1 before working from this file.
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 @boardviews. Enginerys does not host this file.
How to open a .cad file
GenCAD text export, the usual format for Compal, Quanta, Wistron and Dell / HP / Lenovo laptop boards.