Supports SATA for HDDs/SSDs, NGFF (M.2) slots for NVMe SSDs and WLAN/BT modules, and various USB 3.0/2.0 interfaces.

Many techs prefer a boardview file over a schematic. For the platform, search for:

Schematics are copyrighted by Lenovo. They are intended for use by authorized service centers. However, the right-to-repair movement argues that owners and independent shops should have access. If you run a business, consider buying a one-year subscription to a reputable schematic service (e.g., Repair.wiki) to stay legal.

Even though the schematic is shared, the memory addresses for the DMI (Device Management Information) table differ. Always back up the original chip.

A critical nuance: The NM-C561 schematic includes multiple BIOS versions. The GS44B uses a (1MB) for the EC BIOS and a 25R128 (16MB) for the main BIOS. The GS54B might use a MXIC 25L128 .

Integrated Intel KBL-U22 or U42 series CPUs.

The GS44B/GS54B schematic is indispensable for diagnosing complex hardware issues that standard user manuals don't cover.