NM-B681 – Lenovo IdeaPad 330-15AR
The Lenovo IdeaPad 330-15AR and Lenovo IdeaPad 330-15ARR are built on the NM-B681 board designed by LCFC. The catalog lists 5 files for it: 2 BIOS files, 2 schematics and 1 boardview.
Revisions seen in file names: 1.0. ODM project names: EG534 and EG535. First posted in November 2021 in Schematics & Boardviews Archive, Cyberlan Electronics and BIOS Archive.
BIOS dumps 2
Schematics 2
Boardviews 1
Board facts
| Board number | NM-B681 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | EG534, EG535 |
| Revisions | 1.0 |
| Graphics | UMA (integrated) |
| First seen | 2021-11-20 |
| 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-B681
- Lenovo IdeaPad 330-15AR
- Lenovo IdeaPad 330-15ARR
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 |
| .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
Who designed the NM-B681 board?
NM-B681 is an LCFC board number used by Lenovo.
Is there a boardview for NM-B681?
Yes, 1 boardview file.
Which laptops use the NM-B681 board?
Files in the catalog link NM-B681 to the Lenovo IdeaPad 330-15AR and Lenovo IdeaPad 330-15ARR.
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.