820-2936 – Apple A1278
820-2936 is the Apple main board used in the Apple A1278, Apple K90I and Apple MacBook Pro 1278. The catalog lists 21 files for it: 15 BIOS files, 6 schematics and 1 boardview.
Revisions seen in file names: B and A. BIOS images are 8 MB. First posted in December 2018 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 15
Schematics 6
Board facts
| Board number | 820-2936 |
|---|---|
| Numbering | Apple board number |
| Revisions | B, A |
| BIOS chip size | 8 MB |
| Flash chip | MX25L6405, MX25L6406E |
| First seen | 2018-12-12 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics, BIOS Files |
| About the number | Apple logic boards are numbered 820-xxxx or 820-xxxxx; the trailing letter is the revision. |
Apple models for this logic board
| A-number | Model | Years |
|---|---|---|
| A1278 | MacBook Pro 13-inch | 2009–2012 |
A-numbers come from the file names; the model names and years are Apple's published identifiers.
Laptops that use 820-2936
- Apple A1278
- Apple K90I
- Apple MacBook Pro 1278
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 |
|---|---|---|
| .7z | 7-Zip archive | 7-Zip or WinRAR |
| .bdv | Honhan .bdv boardview | OpenBoardView, FlexBV or Honhan BoardViewer |
| .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
What BIOS chip size does 820-2936 use?
The BIOS images for 820-2936 are 8 MB. Flash chips named in the files: MX25L6405 and MX25L6406E.
Which laptops use the 820-2936 board?
Files in the catalog link 820-2936 to the Apple A1278, Apple K90I and Apple MacBook Pro 1278.
Is there a boardview for 820-2936?
Yes, 1 boardview file in .bdv format.
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.