PDF schematic labelled SL410K, a model name that matches the Lenovo ThinkPad SL410 family, although no brand is stated in the file name. No board number or revision is given, so verify the PCB markings against the drawing's revision block before trusting values. Use it to trace power rails, follow the standby and charger circuitry, and find the components behind no-power or no-boot faults. Any PDF reader opens it, and searching net names speeds up finding test points and rails.
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.