Large 28.2 MB PDF schematic for the Samsung GT-I9505, the Galaxy S4 LTE version. The name gives no revision. The size suggests a detailed document, likely with many pages covering power, baseband, RF and peripheral sections. Technicians use it to trace PMIC rails, check charging and USB circuitry, follow display and camera signals and locate test points for short diagnosis. Open it in any PDF reader; be aware that other S4 variants use different boards, so confirm the model and PCB revision before relying on it.
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 @tamirat_moobile. 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.