NM-A491 – Lenovo B71-80
The Lenovo B71-80 and Lenovo IdeaPad 300-17ISK are built on the NM-A491 board designed by LCFC. ChambersDesignInc.com has indexed 5 files for this board — 2 BIOS files, 2 schematics, 1 boardview and 1 EC firmware image.
Revisions seen in file names: 1.0. ODM project name: BMWD1. The earliest file dates from April 2018 (Schematics & Boardviews Archive, Cyberlan Electronics and BIOS Archive).
BIOS dumps 2
Schematics 2
Boardviews 1
From the uploader
Lenovo B71-80
NM-A491 rev. 1.0
CPU: SR2EY (Intel Core i5-6200U)
ITE IT8586E FXA
Bios + EC
Board facts
| Board number | NM-A491 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-A |
| ODM project | BMWD1 |
| Revisions | 1.0 |
| CPU generation | Intel 6th gen |
| First seen | 2018-04-15 |
| Source channels | Schematics & Boardviews Archive, Cyberlan Electronics, BIOS Archive |
| 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-A491
- Lenovo B71-80
- Lenovo IdeaPad 300-17ISK
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 |
| .cad | .cad boardview | FlexBV, OpenBoardView or BoardViewer |
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .rar | RAR archive | 7-Zip or WinRAR |
| .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-A491?
Yes, 1 boardview file in .bdv and .cad format.
Which laptops use the NM-A491 board?
Files in the catalog link NM-A491 to the Lenovo B71-80 and Lenovo IdeaPad 300-17ISK.
Who designed the NM-A491 board?
NM-A491 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.