NM-B481 – Lenovo ThinkPad X1 Carbon
The NM-B481 (LCFC) motherboard is found in the Lenovo ThinkPad X1 Carbon, Lenovo ThinkPad X480 and Lenovo ThinkPad Carbon X1. 10 files are indexed for this board: 8 BIOS files, 2 schematics and 2 EC firmware images.
File names mention revision 1.0. BIOS images are 1 MB, 8 MB and 16 MB. ODM project names: EX480 and FX480. First posted in January 2021 in BIOS Archive, Cyberlan Electronics and Schematics & Boardviews Archive.
BIOS dumps 8
Schematics 2
Board facts
| Board number | NM-B481 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | EX480, FX480 |
| Revisions | 1.0 |
| BIOS chip size | 1 MB, 8 MB, 16 MB |
| EC / KBC chip | MEC1663 |
| CPU generation | Intel 6th gen, Intel 8th gen |
| First seen | 2021-01-31 |
| Source channels | BIOS Archive, Cyberlan Electronics, Schematics & Boardviews Archive |
| 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-B481
- Lenovo ThinkPad X1 Carbon
- Lenovo ThinkPad X480
- Lenovo ThinkPad Carbon X1
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.
EC (embedded controller) firmware runs the keyboard controller, power sequencing, battery charging and fans. Depending on the board it lives in a separate chip (ENE KB9012, ITE IT85xx, Nuvoton NPCE) or inside the main SPI image, so check which applies before flashing.
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 |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Which laptops use the NM-B481 board?
Files in the catalog link NM-B481 to the Lenovo ThinkPad X1 Carbon, Lenovo ThinkPad X480 and Lenovo ThinkPad Carbon X1.
Is there a boardview for NM-B481?
No boardview has been indexed for NM-B481 yet; the schematic is available on this page.
Who designed the NM-B481 board?
NM-B481 is an LCFC board number used by Lenovo.
What BIOS chip size does NM-B481 use?
The BIOS images for NM-B481 are 1 MB, 8 MB and 16 MB.
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.