PDF schematic named j701, 2.88 MB, with no brand recorded in the listing. The name is brief and does not confirm the exact device, so the content should be checked to identify the model and board it covers. Schematics like this let a technician trace power rails, follow charging and connector circuits, check signal paths between ICs and locate components on a shorted line. Any PDF viewer will open it. Compare the model and markings shown inside with those on the PCB before relying on component values or positions.
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.