NM-B451 – Lenovo IdeaPad 330-15IKB
The NM-B451 (LCFC) motherboard is found in the Lenovo IdeaPad 330-15IKB, Lenovo IdeaPad EG521, Lenovo IdeaPad EG522 and Lenovo IdeaPad 320 15IKB. The catalog lists 13 files for it: 7 BIOS files, 3 schematics and 3 boardviews.
Revisions seen in file names: 1.0 and 0.2. The BIOS dumps are 8 MB images. ODM project names: EZ511 and EG721. First posted in February 2021 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 7
Schematics 3
Boardviews 3
From the uploader
LENOVO IDEAPAD 330-15IKB EG521EG522EZ511EG721 NM-B451 REV 1.0 2017-06-26 CLEAN ME BIOS & KBEC
Board facts
| Board number | NM-B451 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | EZ511, EG721 |
| Revisions | 1.0, 0.2 |
| BIOS chip size | 8 MB |
| CPU generation | Intel 8th gen |
| Graphics | UMA (integrated) |
| First seen | 2021-02-10 |
| 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-B451
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 |
| .bin | raw SPI flash image | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
| 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 |
| .zip | ZIP archive | 7-Zip, WinRAR or the built-in Windows extractor |
Questions
Which laptops use the NM-B451 board?
Files in the catalog link NM-B451 to the Lenovo IdeaPad 330-15IKB, Lenovo IdeaPad EG521, Lenovo IdeaPad EG522, Lenovo IdeaPad 320 15IKB and Lenovo ThinkPad P50.
Is there a boardview for NM-B451?
Yes, 3 boardview files in .bdv and .tvw format.
Who designed the NM-B451 board?
NM-B451 is an LCFC board number used by Lenovo.
What BIOS chip size does NM-B451 use?
The BIOS images for NM-B451 are 8 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.