NM-E791
NM-E791 is an LCFC Lenovo main board number. The catalog lists 4 files for it: 1 BIOS file, 1 schematic and 2 boardviews.
Revisions seen in file names: 1.0. BIOS images are 8 MB. First posted in November 2023 in Schematics & Boardviews Archive, Cyberlan Electronics and BIOS Archive.
BIOS dumps 1
Schematics 1
Boardviews 2
Board facts
| Board number | NM-E791 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-E |
| Revisions | 1.0 |
| BIOS chip size | 8 MB |
| First seen | 2023-11-08 |
| Source channels | Schematics & Boardviews Archive, Cyberlan Electronics, BIOS Archive |
| 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-E791 board?
NM-E791 is an LCFC board number used by Lenovo.
What BIOS chip size does NM-E791 use?
The BIOS images for NM-E791 are 8 MB.
Is there a boardview for NM-E791?
Yes, 2 boardview files in .bdv and .tvw format.
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.