STV8102 datasheet in PDF format, 598 KB, with 1_2 in the name likely marking a document version. The name gives the part number only, so consult the first page for the device function, package and pinout. Semiconductor datasheets like this are used to identify pins on the board, check supply and reference voltages, compare measured signals with typical application circuits, and find replacements. Confirm the full marking and package on the chip match the ordering information inside before trusting pin numbers.
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 @acodis_lcd_datasheets_EDID. 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.