Schematic PDF for the Lenovo E390, around 1.5 MB. The name carries no board number, ODM or revision, so read the title block inside to identify the project before work begins. A searchable PDF diagram is handy for tracing the power path from the charger input through the standby and main rails, checking enable signals and reading component values for replacement. Compare the board code printed on your PCB with the schematic to avoid working from documents for a different revision or a related model.
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 @alischematics. 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.