Schematic PDF of about 10 MB named th43e460d, which looks like a television model code, though the brand is not stated and should be confirmed in the document. Service schematics of this kind help a technician trace the power supply, backlight driver and main board signals, locate fuses and test points, and check for shorts. Open it with any PDF reader and compare the board numbers inside with the labels on the actual boards before relying on the voltages shown.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.