NM-C661 – Lenovo ThinkPad X1
The Lenovo ThinkPad X1 and Lenovo ThinkPad X1 Carbon are built on the NM-C661 board designed by LCFC. 6 files are indexed for this board: 4 BIOS files, 2 schematics, 1 boardview and 1 EC firmware image.
Revisions seen in file names: 1.0. The BIOS dumps are 32 MB images. ODM project name: GX490. The earliest file dates from October 2021 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 4
Schematics 2
From the uploader
GX490 NM-C661 REV 1.0 2016-06-04 32MB BIOS
FREE FOR CHANNEL )
Board facts
| Board number | NM-C661 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-C |
| ODM project | GX490 |
| Revisions | 1.0 |
| BIOS chip size | 32 MB |
| CPU generation | Intel 10th gen, Intel 8th gen |
| First seen | 2021-10-14 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics, Boardview Schematics |
| About the number | LCFC is Lenovo's joint venture with Compal; its main boards use NM- numbers and sub-boards NS- numbers. |
Laptops that use NM-C661
What these files are for
A BIOS dump is a full image of the board's SPI flash chip. It is written back with an SPI programmer when the original firmware is corrupted, after a chip replacement, or to recover from a failed update. Read and save the original chip first: serial number, DMI data and the Intel ME / AMD PSP state differ between boards.
A schematic is the circuit diagram of the main board: power rails, power-up sequence, component values and net names. It is the reference for measuring voltages and tracing a fault.
A boardview is the component placement map of the PCB: click a part or a net and the viewer highlights where it is and what it connects to. Used together with the schematic to find test points.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .rar | RAR archive | 7-Zip or WinRAR |
| .zip | ZIP archive | 7-Zip, WinRAR or the built-in Windows extractor |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Are these files free?
1 of the posts are marked VIP or paid in their source channel; the others are ordinary posts. ChambersDesignInc.com does not host or sell files.
What BIOS chip size does NM-C661 use?
The BIOS images for NM-C661 are 32 MB.
Which laptops use the NM-C661 board?
Files in the catalog link NM-C661 to the Lenovo ThinkPad X1 and Lenovo ThinkPad X1 Carbon.
Is there a boardview for NM-C661?
Yes, 1 boardview file.
Who designed the NM-C661 board?
NM-C661 is an LCFC board number used by Lenovo.
Where do the download links go?
Each button opens the original public Telegram post the file was shared in. ChambersDesignInc.com only indexes and cross-references those posts.