ZIP archive called LB56A, 3.89 MB, whose name does not say what it contains. The code may be a chassis or board designation used by a TV or monitor maker, but that cannot be confirmed from the name alone, so unpack it and identify the schematics, firmware or boardview inside. Once known, the material can support power rail tracing, component location or firmware recovery. Compare part numbers on the actual board with the documents before using them in a repair.
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 .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip