NM-B452 – Lenovo IdeaPad EG521
NM-B452 is the LCFC main board used in the Lenovo IdeaPad EG521, Lenovo IdeaPad EG522, Lenovo IdeaPad 320 15IKB and Lenovo IdeaPad 520 15IKB. 15 files are indexed for this board: 10 BIOS files, 3 schematics and 2 boardviews.
Revisions seen in file names: 1.0, 0.0 and 0.2. ODM project names: EZ511 and EG721. First posted in June 2019 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 10
Schematics 3
Boardviews 2
From the uploader
BIOS
Lenovo IdeaPad 320-15IKB (Type 81BG, 81BT) NM-B452
8MB.bin
ITE.bin
Lenovo IdeaPad 320-15IKB (Type 80XL, 80YE) NM-B452
520-15IKB EG521 EG522 EZ511 EG721 NM-B452 REV 1.0 2017.07.03 TESTED OK
LENOVO_IdeaPad_320_15IKB_520_15IKB_EG521_EG522_EZ511_EG721_NM_B452 2017-07-03 WORKING BIOS & KBEC 100%
Board facts
| Board number | NM-B452 |
|---|---|
| Designed by | LCFC |
| Platform group | NM-B |
| ODM project | EZ511, EG721 |
| Revisions | 1.0, 0.0, 0.2 |
| CPU generation | Intel 7th gen |
| Graphics | discrete GPU |
| First seen | 2019-06-18 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics, Boardview Schematics |
| 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-B452
- Lenovo IdeaPad EG521
- Lenovo IdeaPad EG522
- Lenovo IdeaPad 320 15IKB
- Lenovo IdeaPad 520 15IKB
- Lenovo EG523
- Lenovo IdeaPad 4WCN41WW
- Lenovo IP520
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 |
|---|---|---|
| .7z | 7-Zip archive | 7-Zip or WinRAR |
| 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
Who designed the NM-B452 board?
NM-B452 is an LCFC board number used by Lenovo.
Which laptops use the NM-B452 board?
Files in the catalog link NM-B452 to the Lenovo IdeaPad EG521, Lenovo IdeaPad EG522, Lenovo IdeaPad 320 15IKB, Lenovo IdeaPad 520 15IKB, Lenovo EG523, Lenovo IdeaPad 4WCN41WW and Lenovo IP520.
Is there a boardview for NM-B452?
Yes, 2 boardview files in .tvw format.
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.