Schematic PDF, 518 KB, named U56E_RG. U56E is the model or board code, and the RG suffix is not explained in the name, so check the title pages to understand it. The fairly small size may mean the document covers only part of the design. Open it in any PDF reader and look for power rail diagrams, regulator stages and connector pinouts useful for diagnosis. Compare revision information with the motherboard markings 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 @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)