Very large Lenovo ThinkPad schematic collection, about 2.20 GB in one numbered RAR archive. The name gives only the product line, not specific models or board numbers. ThinkPad mainboards are built by several ODMs, including Compal, Wistron and Quanta, and their schematics are the main reference for tracing power rails, checking the power-on sequence and finding the source of a short. Find the board number on the PCB and pick the matching revision from the extracted set."}
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 @videocard_notebook_resistance. 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.