Schematic PDF for the Samsung SM-J120F, the Galaxy J1 2016 model, 2.39 MB in size. The name states no board revision. Technicians use these pages to follow power rails from the PMIC, check the charging circuit and USB connector, trace display, backlight and key signals and locate the parts involved in no-power faults. Open it in a PDF reader and use text search for nets and references. Confirm that the revision printed on your mainboard matches the drawing before replacing parts from 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 @tamirat_moobile. 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.