Schematic in PDF format, 882 KB, for an A780 handset at board revision A2, carrying an smdmobile.ir watermark. The name does not state the brand, so confirm the model on the device label. A phone schematic shows the power management IC, battery and charging lines, RF section and peripheral connections. That lets you trace a dead rail or a shorted capacitor to its source. Check that the A2 revision matches your PCB, as a later revision may move or change components.
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 @mobileshematic. 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.