Fly SL500I schematic, provided as a 753 KB PDF. The diagrams let a repair technician follow the battery and charger circuitry, regulator outputs and the lines between the baseband and the display, camera, speaker and SIM connectors. Typical uses include checking for a short on a supply rail, finding the correct test point and identifying a replacement part by its reference designator. Open it in a standard PDF reader, and check that the board identification on the PCB agrees with the drawing first.
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.