Circuit diagram in PDF for an IBM-branded X201i, given in the name as X201I, roughly 1.62 MB. No board number or revision appears in the file name, so check the sheet headers against the silkscreen on your motherboard first. An i-suffixed variant may differ from the standard model, so confirm compatibility before using it. Technicians rely on such schematics to follow power sequencing, locate the charger and system regulators, and check where a shorted rail originates. A standard PDF reader with text search handles it well for net and part lookups.
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 @cyberlanelectonik. 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.