820-3482 – Apple A1418
The 820-3482 (Apple) motherboard is found in the Apple A1418 and Apple iMac J16. ChambersDesignInc.com has indexed 2 files for this board — 1 BIOS file and 1 schematic.
File names mention revision A. First posted in April 2024 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 1
Schematics 1
Board facts
| Board number | 820-3482 |
|---|---|
| Numbering | Apple board number |
| Revisions | A |
| First seen | 2024-04-27 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics |
| 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 |
|---|---|---|
| A1418 | iMac 21.5-inch | 2012–2019 |
A-numbers come from the file names; the model names and years are Apple's published identifiers.
Laptops that use 820-3482
- Apple A1418
- Apple iMac J16
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 |
|---|---|---|
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .rar | RAR archive | 7-Zip or WinRAR |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Is there a boardview for 820-3482?
No boardview has been indexed for 820-3482 yet; the schematic is available on this page.
Which laptops use the 820-3482 board?
Files in the catalog link 820-3482 to the Apple A1418 and Apple iMac J16.
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.