Samsung SM-J200F schematic, the Galaxy J2 2015, supplied as a 5.21 MB PDF; the name includes a trailing dash but no revision or board number. The diagram is used to trace battery and charging lines, PMIC outputs, display and backlight circuits and key signals, and to find test points while hunting a short. Open it in any PDF reader and use search for net names or references. Check that the revision printed on the mainboard agrees with the schematic before replacing parts on its basis.
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.