NM-C821 – Lenovo 15ADA05 GS450
The Lenovo 15ADA05 GS450 is built on the NM-C821 board designed by LCFC. 11 files are indexed for this board: 6 BIOS files, 2 schematics and 3 boardviews.
File names mention revision 1.0 or 0.2. ODM project names: GS550 and GS750. The earliest file dates from June 2021 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 6
Schematics 2
Boardviews 3
Board facts
| Board number | NM-C821 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-C |
| ODM project | GS550, GS750 |
| Revisions | 1.0, 0.2 |
| First seen | 2021-06-23 |
| 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-C821
- Lenovo 15ADA05 GS450
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 |
| .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
Who designed the NM-C821 board?
NM-C821 is an LCFC board number used by Lenovo.
Which laptops use the NM-C821 board?
Files in the catalog link NM-C821 to the Lenovo 15ADA05 GS450.
Is there a boardview for NM-C821?
Yes, 3 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.