Check if the CPU is getting warm. If it stays ice cold, the VCORE PWM controller chip is not firing the gates of the MOSFETs. Check the enablement pin voltage on the PWM controller chip.
For example, if you look and see G31MXP printed on the board, you know you have the Intel variant. If you see a sticker that reads K8T890M2AA-RS2H , you have the AMD one. Once you have this actual model name, your search for the schematic becomes much more targeted. foxconn n15235 motherboard schematic
Do you see any like bulging capacitors or burn marks? Share public link Check if the CPU is getting warm
Engineers and hobbyists use these schematics to trace power rails and signal paths. Common points of interest in these older diagrams include: foxconn n15235 motherboard schematic