Short PDF document of 370 KB for a board marked 715G4989, with the FA prefix in the name. 715G numbers are the part code style used by TPV, the maker of AOC and Philips monitors and TVs, often for power or main boards. The document likely shows a single board circuit, useful for checking component values, tracing the supply rails and locating faulty parts when a monitor or TV fails to power up. The device model is not named, so confirm the board number printed on the PCB before comparing 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 @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.