Now that we've established the context, let's dive into the specifics of the GS44B GS54B NM-C561 schematic. When working with schematics, it's essential to understand the various symbols, notations, and abbreviations used.
Before the EC (Embedded Controller) wakes up, the board needs 3V_ALW (Always On) and 5V_ALW .
Once the power button is pressed, the EC sends a wake signal to the PCH/CPU. The board then releases the remaining system rails: RAM power supply rail. +1.0V_VCCIO : CPU Input/Output voltage rail. +0.8V_VCCSA : System Agent voltage rail.
Always download the manufacturing programmer files if available. For the NM-C561, you often need to flash both the main BIOS and the EC BIOS simultaneously. The schematic will tell you the logic levels (3.3V vs 1.8V) for your programmer.