| Specification | Detail | | :--- | :--- | | | GS44B / GS54B / NM-C561 | | PCB Markings | GS44B, GS54B, GS44C, GS54C, NM-C561 REV: 1.0 (or 0.1S) | | Key Laptop Models | Lenovo IdeaPad S145-15IKB (Model: 81XM), Lenovo V15-IKB | | Primary Chipset | Intel Kaby Lake R (8th Gen) / Whiskey Lake | | Common CPUs | Intel Core i3-8130U, i5-8250U (Soldered) | | Memory Support | Up to 16GB DDR4, Onboard + SODIMM slot | | Status | Discontinued (Common in repair shops) |

For component-level repair technicians, micro-soldering enthusiasts, and hardware engineers, having access to the official schematic diagram and Boardview file for the NM-C561 motherboard is the difference between a successful fix and a scrapped board. This comprehensive guide breaks down the architecture, power rails, common failure points, and diagnostic steps for the Lenovo GS44B/GS54B NM-C561 motherboard. 1. Motherboard Specifications & Architecture Overview

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Note: CPU and GPU core inductors naturally have very low resistance (sometimes between ). Do not mistake this low impedance for a dead short. Step 3: Verify the Power Button Signal