Archive labelled J610FN, 11.7 MB in RAR form; the name gives only a model code and no brand or content description. Open it to see whether it holds schematics, layouts or a service manual. Such documentation is used to trace power rails, check charging and display circuits and locate parts around a fault. Before using measurements or part references, confirm that the model code printed on the device label is exactly J610FN, since related variants may differ in hardware.
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 @SMART_PHONE_SCHEMATICS. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.