LA-6921P – Lenovo ThinkPad E420S
The LA-6921P (Compal) motherboard is found in the Lenovo ThinkPad E420S. ChambersDesignInc.com has indexed 2 files for this board — 1 BIOS file, 1 schematic and 1 EC firmware image.
File names mention revision 1.0. First posted in May 2021 in BIOS Archive and Schematics & Boardviews Archive.
BIOS dumps 1
Schematics 1
Board facts
| Board number | LA-6921P |
|---|---|
| Designed by | Compal |
| Platform group | LA-6 |
| Revisions | 1.0 |
| Graphics | UMA (integrated) |
| First seen | 2021-05-27 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive |
| About the number | Compal board numbers start with LA- for main boards and LS- for daughter boards. |
Laptops that use LA-6921P
- Lenovo ThinkPad E420S
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.
EC (embedded controller) firmware runs the keyboard controller, power sequencing, battery charging and fans. Depending on the board it lives in a separate chip (ENE KB9012, ITE IT85xx, Nuvoton NPCE) or inside the main SPI image, so check which applies before flashing.
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
Is there a boardview for LA-6921P?
No boardview has been indexed for LA-6921P yet; the schematic is available on this page.
Who designed the LA-6921P board?
LA-6921P is a Compal board number used by Lenovo.
Which laptops use the LA-6921P board?
Files in the catalog link LA-6921P to the Lenovo ThinkPad E420S.
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.