NM-D491 – Lenovo HP 550
The HP 550, Lenovo ThinkPad P15 Gen 2 and Lenovo ThinkPad P17 Gen 2 are built on the NM-D491 board designed by LCFC. ChambersDesignInc.com has indexed 7 files for this board — 3 BIOS files and 4 boardviews.
Revisions seen in file names: 0.4, 1.0 and 2.0. First posted in December 2023 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 3
Boardviews 4
Board facts
| Board number | NM-D491 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-D |
| Revisions | 0.4, 1.0, 2.0 |
| Graphics | discrete GPU |
| First seen | 2023-12-13 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics, Boardview Schematics |
| 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-D491
- HP 550
- Lenovo ThinkPad P15 Gen 2
- Lenovo ThinkPad P17 Gen 2
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 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 |
| .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
Is there a boardview for NM-D491?
Yes, 4 boardview files in .bdv and .tvw format.
Which laptops use the NM-D491 board?
Files in the catalog link NM-D491 to the HP 550, Lenovo ThinkPad P15 Gen 2 and Lenovo ThinkPad P17 Gen 2.
Who designed the NM-D491 board?
NM-D491 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.