RAR archive for the Asus P552LJ laptop with the RG suffix in the name, likely containing the mainboard schematic or a related service file. The meaning of RG is not stated, so open the 791 KB package and confirm the contents. Asus names its boards after the model, so check that the model and revision printed on the PCB match the document. A diagram of this kind helps a technician follow the adapter input, battery charger, CPU and memory rails, and locate the parts responsible for a short or missing voltage.
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 @cidschematicandboardviewofficial. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.