NM-B521 – Lenovo ThinkPad X280
The Lenovo ThinkPad X280 is built on the NM-B521 board designed by LCFC. ChambersDesignInc.com has indexed 9 files for this board — 7 BIOS files, 1 schematic and 1 boardview.
Revisions seen in file names: 1.0, 2.0 and 0.3. ODM project names: EX280 and FN1KR. First posted in January 2021 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 7
Schematics 1
Boardviews 1
From the uploader
EX280 NM-B521 REV 2.0 2018-03-29
BIOS & EC & MEC
Board facts
| Board number | NM-B521 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | EX280, FN1KR |
| Revisions | 1.0, 2.0, 0.3 |
| CPU generation | Intel 8th gen |
| First seen | 2021-01-18 |
| 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-B521
- Lenovo ThinkPad X280
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 |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Which laptops use the NM-B521 board?
Files in the catalog link NM-B521 to the Lenovo ThinkPad X280.
Is there a boardview for NM-B521?
Yes, 1 boardview file.
Who designed the NM-B521 board?
NM-B521 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.