Schematic PDF of 1.14 MB named for J250F, with no brand or board revision in the name; SM-J250F follows Samsung's Galaxy J2 Pro style numbering. The diagrams are used to trace power rails from the PMIC, follow charging circuitry, and find parts connected to a shorted line. Any PDF reader opens it. Since the name gives only a short code, confirm the full model number on the handset and compare board markings before relying on component locations.
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 @uzb4422. 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)