Large 356 MB RAR archive named DDBTVVKV40FH18X, a code that does not clearly identify the device. A size this large suggests full firmware images or software packages rather than schematics, but its contents must be checked after extraction. Such archives are used to reload firmware to a TV main board through USB or a programmer, or to restore a corrupted eMMC or flash. Confirm the model, mainboard and panel codes before writing anything, and keep a backup of the existing memory contents.
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 @gunvantrathore. 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.