820-2143 – Apple A1224
The Apple A1224 is built on the 820-2143 board. The catalog lists 2 files for it: 1 BIOS file and 1 schematic.
Revisions seen in file names: A. First posted in October 2021 in Cyberlan Electronics, Schematics & Boardviews Archive and BIOS Archive.
BIOS dumps 1
Schematics 1
Board facts
| Board number | 820-2143 |
|---|---|
| Numbering | Apple board number |
| Revisions | A |
| First seen | 2021-10-02 |
| Source channels | Cyberlan Electronics, Schematics & Boardviews Archive, BIOS 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 |
|---|---|---|
| A1224 | iMac 20-inch | 2007–2009 |
A-numbers come from the file names; the model names and years are Apple's published identifiers.
Laptops that use 820-2143
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.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| .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
Which laptops use the 820-2143 board?
Files in the catalog link 820-2143 to the Apple A1224.
Is there a boardview for 820-2143?
No boardview has been indexed for 820-2143 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.