PDF document of 3.33 MB labelled VST59SP89, apparently covering the VST59S universal LCD TV controller board series. The name gives no further detail on the panel or firmware version. Such documents are used to check pinouts, supply voltages, LVDS and backlight control lines, and the connector layout when fitting or repairing a universal board. It opens in any PDF viewer. Verify that the exact board marking printed on your PCB matches before applying settings or connection diagrams, since variants within this board family differ.
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 @datasheets1. 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.