RAR archive of 2.31 MB named leo4000f, which gives no brand or file type. The name may refer to a TV or board model, but that cannot be confirmed from the title, so open the archive to see what it holds. If it contains a firmware dump, write it to the matching flash chip with an SPI programmer only after backing up the original. If it holds documentation, use it to trace power rails and locate test points. Always confirm the board marking before relying on it.
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 @hashmielecom. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)