Once the Super IO sees a valid PWRBTN#, it sends PSON# low to the main power supply. The schematic traces PSON# from the Super IO PS_ON pin to the ATX connector PS_ON# . If PSON# doesn’t go low, the Super IO is faulty or missing its +3VSB_EC rail.
Once you open your , it can look like a chaotic spiderweb. Let’s decode it page by page. hp desktop motherboard schematic diagram pdf
For HP ProDesk 600 G4 (motherboard L04640-001), a paid schematic shows the exact pull-up resistor for the PCH’s RSMRST# signal – a common no-power fault. Once the Super IO sees a valid PWRBTN#,
For HP desktops (e.g., models like the HP EliteDesk 800 G3 or HP Pavilion 590), the schematic is board-specific. A diagram for an board will not work for an HP Odense2-K board. Once you open your , it can look like a chaotic spiderweb