You have read the masterclass. Now it is time to download the Desktop Motherboard Power Sequence – Exclusive Technical PDF.
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Even when your computer is "off" (plugged in but not running), it is technically alive. This is the G3 State. desktop motherboard power sequence pdf exclusive
Diagnostic Note: If there is no 5VSB, the SIO never wakes up, and the power button does nothing.
The SIO pulls the PS_ON# pin (green wire on the 24-pin connector) to ground. This is the master enable for the ATX PSU. You have read the masterclass
What happens inside the PSU:
Exclusive Requirement: PWR_OK must go high 100ms to 500ms after PS_ON# is pulled low. If PWR_OK does not arrive within this window, the motherboard assumes a faulty PSU and aborts. License: Free for personal and professional repair use
| Symptom | Likely Cause | Check This Signal | | :--- | :--- | :--- | | No reaction at all | Standby Failure | 3.3VSB / RSMRST# | | Fan spins for 1s, stops | Short Circuit | PSON# Toggle / Overcurrent Protection | | Fans spin, Black Screen | Main Power OK, Reset Fail | PLTRST# / BIOS CS# | | Debug LED: CPU | VCORE Failure or Bent Pins | VCORE Voltage / VRM MOS | | Debug LED: RAM | Memory Voltage or Training | VDDQ / VTT / SPD Data |