ECS motherboard schematic for the G420, supplied as a 1.22 MB PDF with no revision stated in the name. As a board maker, Elitegroup produced designs that were sold under several brands, so confirm the board identification on the PCB before trusting component references. Use the sheets to trace the main power rails, check the standby and enable signals during a no-power fault, look up resistor and capacitor values, and see how connectors map to the chipset and embedded controller.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @ITHINKHS. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.