NM-B391 – Lenovo Legion Y520-15IKBN
The NM-B391 (LCFC) motherboard is found in the Lenovo Legion Y520-15IKBN, Lenovo ThinkPad R720 15IKBM and Lenovo Y520 15IKBM. ChambersDesignInc.com has indexed 8 files for this board — 6 BIOS files, 1 schematic, 1 boardview and 2 EC firmware images.
Revisions seen in file names: 1.0 and V1. ODM project names: DY520 and DY512. The earliest file dates from November 2020 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 6
Schematics 1
Boardviews 1
From the uploader
Lenovo Y520-15IKBM MODEL 80YY NM-B391 REV 1.0 NVIDIA N17E-G1-A1 SR30W SR32Q
LENOVO R720-15IKBM DY520 NM-B391 REV 1.0 2017-04-14 7th Gen CPU
LENOVO R720-15IKBM DY520 NM-B391 REV 1.0 2017-04-14 i7-7700 1060 6G
Board facts
| Board number | NM-B391 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | DY520, DY512 |
| Revisions | 1.0, V1 |
| CPU generation | Intel 7th gen |
| First seen | 2020-11-07 |
| 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-B391
- Lenovo Legion Y520-15IKBN
- Lenovo ThinkPad R720 15IKBM
- Lenovo Y520 15IKBM
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 |
| .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
Which laptops use the NM-B391 board?
Files in the catalog link NM-B391 to the Lenovo Legion Y520-15IKBN, Lenovo ThinkPad R720 15IKBM and Lenovo Y520 15IKBM.
Who designed the NM-B391 board?
NM-B391 is an LCFC board number used by Lenovo.
Is there a boardview for NM-B391?
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.