LA-B303P – Toshiba Satellite C55-B
The Toshiba Satellite C55-B, Toshiba Satellite C55, Toshiba Satellite C55-B148 and Toshiba Satellite C55T are built on the LA-B303P board designed by Compal. ChambersDesignInc.com has indexed 7 files for this board — 4 BIOS files, 3 schematics and 1 EC firmware image.
File names mention revision 1.0. The earliest file dates from September 2017 (BIOS Archive, Cyberlan Electronics and Schematics & Boardviews Archive).
BIOS dumps 4
Schematics 3
Board facts
| Board number | LA-B303P |
|---|---|
| Designed by | Compal |
| Platform group | LA-B |
| Revisions | 1.0 |
| First seen | 2017-09-21 |
| Source channels | BIOS Archive, Cyberlan Electronics, Schematics & Boardviews Archive, Laptop & Desktop BIOS Files |
| About the number | Compal board numbers start with LA- for main boards and LS- for daughter boards. |
Laptops that use LA-B303P
- Toshiba Satellite C55-B
- Toshiba Satellite C55
- Toshiba Satellite C55-B148
- Toshiba Satellite C55T
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 |
|---|---|---|
| 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 |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Who designed the LA-B303P board?
LA-B303P is a Compal board number used by Toshiba.
Which laptops use the LA-B303P board?
Files in the catalog link LA-B303P to the Toshiba Satellite C55-B, Toshiba Satellite C55, Toshiba Satellite C55-B148 and Toshiba Satellite C55T.
Is there a boardview for LA-B303P?
No boardview has been indexed for LA-B303P 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.