Schematic in PDF for the ASUS K501LX, with RepairG in the name, a common tag for ASUS repair-guide style schematics, packed in a 1021 KB RAR.

Revision 1.2 schematic listed for the ASUS K40AA and K50AF laptops, a 1.28 MB PDF that appears to share its design with the K40AA and K50AB drawing.

Schematics shared by the ASUS K40IJ and K50IJ notebooks, revision R2.0, in a RAR archive of 1.27 MB.

ASUS schematic covering the K40IJ and K50IJ notebooks, which share one mainboard design, at revision 2.0.

ASUS motherboard schematic shared by the K40IJ and K50IJ notebooks, revision 2.0 according to the r20 marking, with 0309 most likely a date code from March 2009.

ASUS schematic covering the K40AA and K50AB models at revision 1.2, stored as a 1.28 MB PDF, suggesting the two laptops share one board design.

Second copy of the ASUS K40IJ and K50IJ schematic set, revision 2.0, shared between both models as a 2.68 MB PDF.

Shared schematic for the ASUS K40IJ and K50IJ notebooks, revision 1.1, in a 1.63 MB PDF.

Shared schematic for the ASUS K40IJ and K50IJ notebooks at revision 1.1, distributed as a PDF of about 1.63 MB.

PDF of about 1 MB filed under ASUS and titled N156B6-L0B, which is the model code of a 15.6-inch LCD panel rather than a laptop mainboard.