LA-H091P – Lenovo S540 14API
The LA-H091P (Compal) motherboard is found in the Lenovo S540 14API. The catalog lists 2 files for it: 1 BIOS file, 1 schematic and 1 EC firmware image.
File names mention revision 1.0. The BIOS dumps are 8 MB images. The earliest file dates from February 2021 (Cyberlan Electronics, Schematics & Boardviews Archive and BIOS Archive).
BIOS dumps 1
Schematics 1
Board facts
| Board number | LA-H091P |
|---|---|
| Designed by | Compal |
| Platform group | LA-H |
| Revisions | 1.0 |
| BIOS chip size | 8 MB |
| First seen | 2021-02-03 |
| Source channels | Cyberlan Electronics, Schematics & Boardviews Archive, BIOS Archive |
| About the number | Compal board numbers start with LA- for main boards and LS- for daughter boards. |
Laptops that use LA-H091P
- Lenovo S540 14API
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
Which laptops use the LA-H091P board?
Files in the catalog link LA-H091P to the Lenovo S540 14API.
Is there a boardview for LA-H091P?
No boardview has been indexed for LA-H091P yet; the schematic is available on this page.
Who designed the LA-H091P board?
LA-H091P is a Compal board number used by Lenovo.
What BIOS chip size does LA-H091P use?
The BIOS images for LA-H091P are 8 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.