LA-7851P – Dell XPS 15Z
The LA-7851P (Compal) motherboard is found in the Dell XPS 15Z, Dell XPS L521X, Dell XPS 15 and Dell XPS15. ChambersDesignInc.com has indexed 4 files for this board — 3 BIOS files, 1 schematic and 1 EC firmware image.
ODM project name: QBL00. First posted in June 2021 in BIOS Skema Boardview Laptop, BIOS Archive and Schematics & Boardviews Archive.
BIOS dumps 3
Schematics 1
Board facts
| Board number | LA-7851P |
|---|---|
| Designed by | Compal |
| Platform group | LA-7 |
| ODM project | QBL00 |
| First seen | 2021-06-12 |
| Source channels | BIOS Skema Boardview Laptop, 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-7851P
- Dell XPS 15Z
- Dell XPS L521X
- Dell XPS 15
- Dell XPS15
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 |
|---|---|---|
| .bin | raw SPI flash image | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .rar | RAR archive | 7-Zip or WinRAR |
| .zip | ZIP archive | 7-Zip, WinRAR or the built-in Windows extractor |
Questions
Which laptops use the LA-7851P board?
Files in the catalog link LA-7851P to the Dell XPS 15Z, Dell XPS L521X, Dell XPS 15 and Dell XPS15.
Who designed the LA-7851P board?
LA-7851P is a Compal board number used by Dell.
Is there a boardview for LA-7851P?
No boardview has been indexed for LA-7851P yet; the schematic is available on this page.
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.