Second copy of the THL32C3D TV service document, a 16.2 MB PDF with a -1 suffix and the same size as the unsuffixed file, so it is most likely a duplicate. A standard PDF reader opens it. Technicians use these pages for tracing the power board, main board and backlight circuits, measuring test points and identifying failed components. If both copies are identical, keep one; either way, verify the model label and board numbers of the set before working from 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 @datasheets1. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)