820-01134 – Apple A1419
The Apple A1419 is built on the 820-01134 board. ChambersDesignInc.com has indexed 4 files for this board — 2 BIOS files, 1 schematic and 1 boardview.
Revisions seen in file names: A. The earliest file dates from May 2022 (BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics).
BIOS dumps 2
Schematics 1
Boardviews 1
Board facts
| Board number | 820-01134 |
|---|---|
| Numbering | Apple board number |
| Revisions | A |
| First seen | 2022-05-25 |
| 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 |
|---|---|---|
| A1419 | iMac 27-inch | 2012–2019 |
A-numbers come from the file names; the model names and years are Apple's published identifiers.
Laptops that use 820-01134
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
Which laptops use the 820-01134 board?
Files in the catalog link 820-01134 to the Apple A1419.
Is there a boardview for 820-01134?
Yes, 1 boardview file in .bdv and .brd 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.