820-00840 – Apple A1708
820-00840 is the Apple main board used in the Apple A1708. The catalog lists 8 files for it: 4 BIOS files, 2 schematics and 2 boardviews.
File names mention revision A. First posted in February 2019 in Schematics & Boardviews Archive, Cyberlan Electronics and BIOS Archive.
BIOS dumps 4
Schematics 2
Boardviews 2
Board facts
| Board number | 820-00840 |
|---|---|
| Numbering | Apple board number |
| Revisions | A |
| First seen | 2019-02-23 |
| Source channels | Schematics & Boardviews Archive, Cyberlan Electronics, 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 |
|---|---|---|
| A1708 | MacBook Pro 13-inch, two Thunderbolt 3 ports | 2016–2017 |
A-numbers come from the file names; the model names and years are Apple's published identifiers.
Laptops that use 820-00840
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 |
|---|---|---|
| .bin | raw SPI flash image | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
| .brd | .brd boardview (Test_Link format) | OpenBoardView, FlexBV or BoardViewer |
| .rar | RAR archive | 7-Zip or WinRAR |
| .zip | ZIP archive | 7-Zip, WinRAR or the built-in Windows extractor |
Questions
Is there a boardview for 820-00840?
Yes, 2 boardview files in .brd format.
Which laptops use the 820-00840 board?
Files in the catalog link 820-00840 to the Apple A1708.
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.