Samsung Q20 schematic, a 5.24 MB PDF whose name lists the model and a website tag but no board number or revision. The larger size may indicate scanned pages, so zoom and readability can vary. Use it for tracing power rails, finding the regulators and MOSFETs behind a missing voltage, and checking which components share a shorted net. Look at the title block to confirm the Samsung project name and revision, and compare it with the markings on the motherboard before relying on the drawing.
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.