Lenovo ThinkPad schematic for board NM-A151 in PDF form, 1.79 MB. The NM- numbering belongs to LCFC, the Lenovo ODM behind many ThinkPad boards. Technicians open it in any PDF viewer to follow power rails from the adapter input through the charger and regulators, check sequencing signals and identify parts near a short. Text search, where available, speeds up locating nets. Verify that the board number and revision on the PCB correspond before relying on component values.
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 @pkbiosbdv. 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.