Schematic document for the Huawei Honor 4x smartphone, provided as a 1.16 MB PDF; the name gives no board number or hardware revision. Typical uses include tracing supply rails from the power management IC, checking charging and battery circuits, and confirming connector pinouts for the LCD, cameras and USB port. Any standard PDF viewer opens it. Since the Honor 4x was sold in several regional variants, confirm that the board in hand matches the drawings before measuring against stated values.
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.