18777-1 – Lenovo Yoga S940-14IIL
18777-1 is the Wistron main board used in the Lenovo Yoga S940-14IIL. ChambersDesignInc.com has indexed 4 files for this board — 1 BIOS file, 2 schematics and 1 boardview.
The earliest file dates from June 2022 (Schematics & Boardviews Archive, Cyberlan Electronics and BIOS Archive).
BIOS dumps 1
Schematics 2
Boardviews 1
Board facts
| Board number | 18777-1 |
|---|---|
| Designed by | Wistron |
| Platform group | 18XXX |
| Also known as | 448.0HB02.0011 |
| First seen | 2022-06-28 |
| Source channels | Schematics & Boardviews Archive, Cyberlan Electronics, BIOS Archive |
| About the number | Wistron board numbers look like 15217-1; the first two digits usually indicate the design year. |
Laptops that use 18777-1
- Lenovo Yoga S940-14IIL
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 |
| .cad | .cad boardview | FlexBV, OpenBoardView or BoardViewer |
| 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
Is there a boardview for 18777-1?
Yes, 1 boardview file in .bdv and .cad format.
Who designed the 18777-1 board?
18777-1 is a Wistron board number used by Lenovo.
Which laptops use the 18777-1 board?
Files in the catalog link 18777-1 to the Lenovo Yoga S940-14IIL.
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.