Lenovo E40 laptop schematic produced by Quanta, marked LD-NOTE UMA under the project name Diamond-3, in a compact 975 KB PDF. UMA means the integrated-graphics version, so boards with a discrete GPU will differ in the video section. Quanta builds this board for Lenovo, so the ODM code on the PCB is the reliable identifier. The drawing is used to trace charging, system rails and CPU power, find test points and check for shorted parts. Confirm the board matches before relying on it, and open it with any PDF reader.
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 @afsschematicfree. 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.