820-3115 – Apple A1278
820-3115 is the Apple main board used in the Apple A1278 and Apple MacBook Pro 1278. ChambersDesignInc.com has indexed 13 files for this board — 7 BIOS files, 2 schematics and 4 boardviews.
Revisions seen in file names: B and A. The earliest file dates from December 2018 (BIOS Archive, Cyberlan Electronics and Schematics & Boardviews Archive).
BIOS dumps 7
Schematics 2
Boardviews 4
Board facts
| Board number | 820-3115 |
|---|---|
| Numbering | Apple board number |
| Revisions | B, A |
| Graphics | UMA (integrated) |
| First seen | 2018-12-06 |
| Source channels | BIOS Archive, Cyberlan Electronics, Schematics & Boardviews Archive |
| 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 820-3115
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 |
|---|---|---|
| .bdv | Honhan .bdv boardview | OpenBoardView, FlexBV or Honhan BoardViewer |
| .brd | .brd boardview (Test_Link format) | OpenBoardView, FlexBV or BoardViewer |
| 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
Is there a boardview for 820-3115?
Yes, 4 boardview files in .bdv and .brd format.
Which laptops use the 820-3115 board?
Files in the catalog link 820-3115 to the Apple A1278 and Apple MacBook Pro 1278.
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.