18729-1 – Lenovo ThinkPad X390
18729-1 is the Wistron main board used in the Lenovo ThinkPad X390 and Lenovo Yoga 18729-1. ChambersDesignInc.com has indexed 4 files for this board — 3 BIOS files and 1 schematic.
BIOS images are 1 MB. First posted in February 2021 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 3
Schematics 1
From the uploader
LENOVO ThinkPad X390 Yoga LBB-1 MB 18729-1 448.0G104.0011 WOEKING BIOS 100% 32MB
Board facts
| Board number | 18729-1 |
|---|---|
| Designed by | Wistron |
| Platform group | 18XXX |
| Also known as | 448.0G104.0011 |
| BIOS chip size | 1 MB |
| First seen | 2021-02-07 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics |
| About the number | Wistron board numbers look like 15217-1; the first two digits usually indicate the design year. |
Laptops that use 18729-1
- Lenovo ThinkPad X390
- Lenovo Yoga 18729-1
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.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| .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 18729-1 board?
18729-1 is a Wistron board number used by Lenovo.
Is there a boardview for 18729-1?
No boardview has been indexed for 18729-1 yet; the schematic is available on this page.
Which laptops use the 18729-1 board?
Files in the catalog link 18729-1 to the Lenovo ThinkPad X390 and Lenovo Yoga 18729-1.
What BIOS chip size does 18729-1 use?
The BIOS images for 18729-1 are 1 MB.
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.