Schematic for the Lenovo ThinkPad T430u packed in a 1.64 MB RAR archive. The file name gives no board number or revision, so check the documents inside against the markings on your motherboard. Extract it with 7-Zip or WinRAR, then open the diagrams to follow power rails, check the charging and standby circuits, and trace the signals involved in no-power or no-display faults. Schematics also help you identify part values when replacing burnt components near the DC jack or the voltage regulators.
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 @fixtronix. 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.