Archive for the TCL 39T3520 LED TV, 3.18 MB, in RAR format. The name identifies the model but not the contents, so it is unknown whether this is a flash dump, a service manual or a board diagram. For TV repair, such packages are typically used to restore corrupted software on the main board SPI flash. Extract it and check the file names and sizes. Back up the existing chip with a programmer before writing, and match the main board number, since one model can use several chassis.
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.