PDF schematic named only j701, 2.88 MB, with no brand in the name. The token resembles a phone model code, but the file name alone does not confirm the manufacturer or exact model. Open it and read the title block on the first pages to confirm what it covers before relying on it. Once confirmed, the circuit sheets serve the usual tasks: following power rails, locating components and test points, and checking connections when diagnosing no power, charging or display faults.
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_mobiles. 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.