Check the sequence timing diagram in the schematic document. Ensure that after SYSON triggers, the
When the power button is pressed, the signal PBTN_OUT# drops low momentarily and feeds into the AMD Processor/Southbridge block. gs44b gs54b nm-c561 schematic
Before injecting voltage or scraping traces, check the board under a microscope for liquid corrosion, burned MOSFETs, or cracked ceramic capacitors (MLCCs). Check the sequence timing diagram in the schematic document