Schematic PDF named LA46-Dis, with no brand, model or full board number stated, so the exact target is unclear. The Dis part plausibly refers to a discrete graphics version, but this cannot be confirmed from the name alone. At 1.59 MB it should contain a full set of circuit pages. Use it to trace rails, check signals and locate components only after comparing codes and chip markings on the board with those in the drawing title blocks, since an uninformative name makes mismatches easy.
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 @schematicslaptop. 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.