PDF document of about 1 MB filed as a schematic under the name e280-le1_e, with no brand, board number or revision clearly stated. The short code alone does not identify the device for certain, so open the file and read the title block to confirm which product and board it covers. Once matched, a schematic serves to trace power rails, follow signal paths and find components and test points during a repair. Check the markings on your PCB against the document before relying on any 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 @smschematics. 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.