NM-B931 – Lenovo ThinkPad L490
The NM-B931 (LCFC) motherboard is found in the Lenovo ThinkPad L490 and Lenovo ThinkPad L590. ChambersDesignInc.com has indexed 11 files for this board — 9 BIOS files, 1 schematic, 1 boardview and 3 EC firmware images.
Revisions seen in file names: 1.0. The BIOS dumps are 1 MB and 32 MB images. ODM project names: FL490 and FL590. The earliest file dates from November 2021 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 9
Schematics 1
Boardviews 1
From the uploader
LENOVO THINKPAD L590 (type 20Q7, 20Q8) FL490 FL590 NM-B931 REV 1.0 2019-03-15 R0ZET35W 32MB
Board facts
| Board number | NM-B931 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | FL490, FL590 |
| Revisions | 1.0 |
| BIOS chip size | 1 MB, 32 MB |
| CPU generation | Intel 8th gen |
| First seen | 2021-11-17 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics |
| 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-B931
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 |
|---|---|---|
| .rar | RAR archive | 7-Zip or WinRAR |
| .tvw | Tebo-ICT .tvw boardview | FlexBV or Tebo-ICT View |
| .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
What BIOS chip size does NM-B931 use?
The BIOS images for NM-B931 are 1 MB and 32 MB.
Who designed the NM-B931 board?
NM-B931 is an LCFC board number used by Lenovo.
Are these files free?
2 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.
Is there a boardview for NM-B931?
Yes, 1 boardview file in .tvw format.
Which laptops use the NM-B931 board?
Files in the catalog link NM-B931 to the Lenovo ThinkPad L490 and Lenovo ThinkPad L590.
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.