Circuit diagram set for the Lenovo ThinkPad E390, delivered as a 1.49 MB PDF. No board number or revision appears in the name, so check the title block inside against the markings on the motherboard before working from it. The diagrams are useful for following the main power rails, checking MOSFETs and protection parts around the charger stage, and tracing USB, display and keyboard connectors. Open it in any PDF reader and search by net name or reference designator to move between sheets.
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 @cyberlanelectonik. 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.