Schematic PDF of 2.88 MB whose name gives only j701, with no brand stated in the record; it likely relates to a J7 series handset, but the exact device should be confirmed by opening the document. A phone schematic of this kind is used to trace power rails, follow charging and USB lines, read connector pinouts and identify components on a shorted rail. It opens in any PDF viewer. Compare the model code on the device and the board markings with the drawing before relying on component references.
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 @Schematics_Mobile. 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.