NM-C781 – Lenovo Yoga GS452
The NM-C781 (LCFC) motherboard is found in the Lenovo Yoga GS452, Lenovo IdeaPad 15SIML2020, Lenovo IdeaPad GS452 and Lenovo Yoga S740. ChambersDesignInc.com has indexed 14 files for this board — 11 BIOS files, 1 schematic, 2 boardviews and 3 EC firmware images.
Revisions seen in file names: 1.0 and 2.0. BIOS images are 16 MB. ODM project names: GS552 and GS752. The earliest file dates from April 2021 (BIOS Archive and Schematics & Boardviews Archive).
BIOS dumps 11
Schematics 1
Boardviews 2
From the uploader
LENOVO IDEAPAD GAMING 3-15IMH05 NM-C781 REV 2.0 2020-03-04 N18P-G61-MP2-A1 OOOKKK
Board facts
| Board number | NM-C781 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-C |
| ODM project | GS552, GS752 |
| Revisions | 1.0, 2.0 |
| BIOS chip size | 16 MB |
| Flash chip | GD25Q128B |
| EC / KBC chip | IT8586E |
| First seen | 2021-04-17 |
| Source channels | BIOS Archive, 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-C781
- Lenovo Yoga GS452
- Lenovo IdeaPad 15SIML2020
- Lenovo IdeaPad GS452
- Lenovo Yoga S740
- Lenovo Yoga S740 14IIL
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 |
| .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
Which laptops use the NM-C781 board?
Files in the catalog link NM-C781 to the Lenovo Yoga GS452, Lenovo IdeaPad 15SIML2020, Lenovo IdeaPad GS452, Lenovo Yoga S740 and Lenovo Yoga S740 14IIL.
Is there a boardview for NM-C781?
Yes, 2 boardview files in .bdv and .tvw format.
Who designed the NM-C781 board?
NM-C781 is an LCFC board number used by Lenovo.
What BIOS chip size does NM-C781 use?
The BIOS images for NM-C781 are 16 MB. Flash chips named in the files: GD25Q128B.
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.