Schematic for the TCL Q510 mobile phone, supplied as a 674 KB PDF. The name gives no board number or revision, so compare the title block with the markings on the phone's PCB. A circuit diagram like this helps technicians trace battery and charging paths, check the power management section, follow signal lines to the display, camera and SIM connectors, and identify which parts sit on a shorted rail. Any common PDF reader can open it for searching net and component names.
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.