Instead of a schematic, you may find a file for the N15235. This is a visual layout showing each component’s exact location, net name, and test point. Use OpenBoardView (free software) to open these files. Many technicians prefer a Boardview over a schematic for physical tracing.
The alphanumeric code "N15235" indicates that the motherboard meets certain Regulatory Compliance foxconn n15235 motherboard schematic
Check the 32.768 kHz crystal (Y1 near the PCH). Use an oscilloscope (or test voltage: one pin ~0.4V, other ~0.7V). If dead, replace it or the PCH is gone. Instead of a schematic, you may find a file for the N15235