A motherboard schematic is essential for "chip-level" repair. If your laptop is "dead" or not charging, the schematic helps you trace power rails:
Before searching for a schematic, confirm your specific laptop model and the secondary motherboard ID: ya-4a194v-0 motherboard schematic
: Start at the power input to ensure 19V is reaching the first MOSFETs. A motherboard schematic is essential for "chip-level" repair