Schematic for the Samsung Galaxy J1 handset with model code SM-J120F, provided as a 2.39 MB PDF. It shows the circuit diagrams that phone technicians use to trace power rails from the battery and charger, follow display and touch connections, and check the PMIC, SIM and audio sections. Any PDF reader opens it, and searching for net or part names speeds up fault finding. Confirm the model code on the device label is SM-J120F before relying on component values, since other regional versions may use different parts.
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 @Schematic_ir20. 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.