RAR archive for the LG 49UJ750 television with the UD71P identifier in its name. The file name does not state what is inside, so it could be a firmware dump, a service file or a board-related document for this TV, and you should check the contents after extracting. With TV dumps, match the main board part number and the memory chip type (eMMC or SPI) before writing anything. Always save a read of the original chip first, because panel and region data are often stored alongside the software.
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 @pdf_servicemanual. 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.