Schematic PDF, 2.09 MB, named only T61. The name states no brand, board number or revision, so read the document cover to confirm what board it describes. Several versions of a design can share a short name, so compare the title block with the markings on the motherboard. The drawings let a technician follow power rails, check sequencing signals and find component values for repairs such as no power, no charge or no display.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)