NM-D521
NM-D521 is an LCFC Lenovo main board number. The catalog lists 7 files for it: 5 BIOS files, 1 schematic and 1 boardview.
File names mention revision 3.0, 1.0 or 2.0. The BIOS dumps are 16 MB images. ODM project names: HS561 and HS761. The earliest file dates from January 2022 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 5
Schematics 1
Boardviews 1
From the uploader
LENOVO IDEAPAD3 HS461 HS561 HS761 NM-D521 REV 3.0 2021-17-7 CPU RYZEN5 5500U
LENOVO IdeaPad 3-15ALC6 Laptop - Type 82KU HS461 HS561 HS761 NM-D521 REV2.0 2020-12-11 AMD RYZEN 5000
Board facts
| Board number | NM-D521 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-D |
| ODM project | HS561, HS761 |
| Revisions | 3.0, 1.0, 2.0 |
| BIOS chip size | 16 MB |
| CPU generation | AMD Ryzen 5000 series |
| First seen | 2022-01-05 |
| 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
What BIOS chip size does NM-D521 use?
The BIOS images for NM-D521 are 16 MB.
Who designed the NM-D521 board?
NM-D521 is an LCFC board number used by Lenovo.
Is there a boardview for NM-D521?
Yes, 1 boardview file 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.