PDF schematic, 1.45 MB, named only UX50, with no maker, board number or revision in the title. The diagram pages should still show the layout of power sequencing, charger and regulator stages, and the interconnects between the main chips. Technicians use such drawings to measure expected voltages, follow enable signals and identify parts near a failed rail. Read the cover page and title block to confirm the exact board and revision. Compare that with the markings on the motherboard before relying on any value.
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.