Boardview for the ASUS X421FL laptop mainboard, revision 2.0 going by the R20 tag, supplied as a 172 KB zip. ASUS mainboards carry the model name and revision on the silkscreen, so compare them before relying on the layout. Open it in OpenBoardView, FlexBV or a compatible viewer to search for parts, highlight nets, find test points and work out which component is pulling a rail to ground. Pairing it with the matching schematic makes it much easier to trace power-on sequence faults and missing voltages.
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 @cynetitsolution. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.