NM-C931
The NM-C931 board comes from LCFC. ChambersDesignInc.com has indexed 8 files for this board — 4 BIOS files, 2 schematics, 2 boardviews and 1 EC firmware image.
File names mention revision 1.0 or 0.2. The BIOS dumps are 32 MB images. First posted in May 2022 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 4
Schematics 2
Boardviews 1
EC / KBC firmware 1
From the uploader
NM-C931 RV 1.0 FLACH+ EEPROM_EC_MEC1663_0x02202445_2KB_CRC32_0x010D86F0_MEC_Patched OK
Board facts
| Board number | NM-C931 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-C |
| Revisions | 1.0, 0.2 |
| BIOS chip size | 32 MB |
| Flash chip | W25Q256FV |
| EC / KBC chip | MEC1663 |
| First seen | 2022-05-21 |
| 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. |
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 |
|---|---|---|
| .bdv | Honhan .bdv boardview | OpenBoardView, FlexBV or Honhan BoardViewer |
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .rar | RAR archive | 7-Zip or WinRAR |
| .tvw | Tebo-ICT .tvw boardview | FlexBV or Tebo-ICT View |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Who designed the NM-C931 board?
NM-C931 is an LCFC board number used by Lenovo.
Is there a boardview for NM-C931?
Yes, 2 boardview files in .bdv and .tvw format.
What BIOS chip size does NM-C931 use?
The BIOS images for NM-C931 are 32 MB. Flash chips named in the files: W25Q256FV.
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.