Pages dedicated to generating +3VALW , +5VALW , +1.2V (RAM), and +1.0V (PCH).
Managed by a synchronous step-down PWM controller chip, these rails convert 20V down to the stable voltages required to awaken the motherboard logic:
For technical repair and component identification, the following files are standard for this model: Schematic Diagram gs44b gs54b nm-c561 schematic
Technicians frequently encounter a few recurring issues on the Lenovo Ideapad 3 series. The schematic reveals why these circuits fail: 1. Missing +3VALW and +5VALW
When this motherboard fails to power on, displays a black screen, or experiences charging issues, having the official schematic diagram and Boardview file is critical for a precise component-level repair. 1. Technical Specifications Overview Pages dedicated to generating +3VALW , +5VALW , +1
A schematic diagram shows the electrical connections through lines and symbols, but it does not show you where the components are physically located on the circuit board. This is where a becomes necessary.
: A known logic-based issue on the NM-C561 board where the numpad stops working due to "Board ID" logic errors. This cannot be fixed by replacing the keyboard or IO chip without understanding the schematic logic. Missing +3VALW and +5VALW When this motherboard fails
This article provides a deep dive into the relationship between these three codes, why you need the schematic, and how to use the boardview file to fix common failures like no power, no display, and USB-C charging faults.
If you download a file for the NM-C561 and it is only 200KB, it is likely a (CAD drawing). If it is 2MB+, it might be a PDF Schematic . If it is a .exe file – delete it immediately – it is malware targeting repair shops.
Broken input circuit or shorted capacitor on the main 20V line.
Do not heat up the CPU or GPU SoC without verifying that all necessary power rails are present and active.
