The Microchip 24LCS21, an EEPROM made for the display data channel used to store monitor EDID, is covered by this 327 KB PDF; the index calls it a schematic, but it is a datasheet. Expect the pinout, DDC1 and DDC2 operating modes, timing and supply specifications. It helps when a monitor or display board reports wrong or missing identification and the EDID memory must be checked or rewritten. Verify whether the part on the board is this original version or the later A revision before programming.
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 @cyberlanelectonik. 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.