NM-A591 – Lenovo Yoga 900S-12ISK
The Lenovo Yoga 900S-12ISK is built on the NM-A591 board designed by LCFC. ChambersDesignInc.com has indexed 4 files for this board — 2 BIOS files, 2 schematics and 1 boardview.
ODM project name: BYG42. The earliest file dates from September 2023 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 2
Schematics 2
Board facts
| Board number | NM-A591 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-A |
| ODM project | BYG42 |
| CPU generation | Intel 6th gen |
| First seen | 2023-09-25 |
| 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-A591
- Lenovo Yoga 900S-12ISK
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 |
|---|---|---|
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .rar | RAR archive | 7-Zip or WinRAR |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Who designed the NM-A591 board?
NM-A591 is an LCFC board number used by Lenovo.
Is there a boardview for NM-A591?
Yes, 1 boardview file.
Which laptops use the NM-A591 board?
Files in the catalog link NM-A591 to the Lenovo Yoga 900S-12ISK.
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.