820-4124

The 820-4124 board comes from Apple. 3 files are indexed for this board: 3 schematics and 2 boardviews.

Revisions seen in file names: A. First posted in August 2026 in Cyberlan Electronics.

Schematics 3

FileSizeRevAddedSource
1.4 MB
—
Get on Telegram Cyberlan Electronics
819 KB
A
Get on Telegram Cyberlan Electronics
468 KB
A
Get on Telegram Cyberlan Electronics

Board facts

Board number820-4124
NumberingApple board number
RevisionsA
First seen2026-08-02
Source channelsCyberlan Electronics
About the numberApple logic boards are numbered 820-xxxx or 820-xxxxx; the trailing letter is the revision.

What these files are for

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

FormatWhat it isOpen with
.pcb.pcb board fileFlexBV or the viewer it was exported from
.pdfPDF schematicany PDF reader; Sumatra PDF and Foxit handle large schematics well
.rarRAR archive7-Zip or WinRAR

Questions

Is there a boardview for 820-4124?

Yes, 2 boardview files in .pcb 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.