NM-A291 – Lenovo G50-75M
The NM-A291 (LCFC) motherboard is found in the Lenovo G50-75M and Lenovo Z50-75. The catalog lists 6 files for it: 5 BIOS files, 1 schematic and 3 EC firmware images.
Revisions seen in file names: 1.0 and 0.1. The BIOS dumps are 8 MB images. ODM project names: ACLU7 and ACLU8. First posted in February 2018 in BIOS Archive, Cyberlan Electronics and Schematics & Boardviews Archive.
BIOS dumps 5
Schematics 1
From the uploader
Lenovo IdeaPad Z50-75
ACLU7 , ACLU8 NM-A291
Rev: 1.0
CPU - AM7100ECH44JA
FCH - AMD 218-0844012
GPU - AMD 216-0856040
KBC - ITE 8586E-FXA
BIOS - Winbond W25Q64
LENOVO G50-75M ACLU7-ACLU8 NM-A291 Rev1.0 BIOS & EC .bin
Board facts
| Board number | NM-A291 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-A |
| ODM project | ACLU7, ACLU8 |
| Revisions | 1.0, 0.1 |
| BIOS chip size | 8 MB |
| Flash chip | W25Q64 |
| First seen | 2018-02-20 |
| Source channels | BIOS Archive, Cyberlan Electronics, Schematics & Boardviews 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-A291
- Lenovo G50-75M
- Lenovo Z50-75
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.
EC (embedded controller) firmware runs the keyboard controller, power sequencing, battery charging and fans. Depending on the board it lives in a separate chip (ENE KB9012, ITE IT85xx, Nuvoton NPCE) or inside the main SPI image, so check which applies before flashing.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| .bin | raw SPI flash image | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
| 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 |
Questions
Which laptops use the NM-A291 board?
Files in the catalog link NM-A291 to the Lenovo G50-75M and Lenovo Z50-75.
What BIOS chip size does NM-A291 use?
The BIOS images for NM-A291 are 8 MB. Flash chips named in the files: W25Q64.
Is there a boardview for NM-A291?
No boardview has been indexed for NM-A291 yet; the schematic is available on this page.
Who designed the NM-A291 board?
NM-A291 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.