Samsung schematic in PDF form, 8.82 MB, named only after the website it came from, so the name identifies no phone model or board revision. Open it in any PDF reader and check the title block to learn which device it covers before using it. Mobile schematics like this help trace power-management IC outputs, battery and charging lines, and display and camera connectors, and locate components when chasing a short. Confirm that the model on the document matches your board.
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 @mobileshematic. 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.