Datasheet-style PDF for the BQ24726, a Texas Instruments SMBus charge controller part number used in notebook power circuits, size 1.28 MB. It should list pin functions, the typical application schematic and charger register settings. Repair technicians use it to trace the adapter input path, check the ACDET and ACOK signals, measure gate drive to the power MOSFETs and decide whether a no-charge or no-power fault lies in the charger itself. Confirm the IC marking on the board matches before relying on 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 @laptopbios21. 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.