Apple · laptop motherboard

Apple iMac A1419 820-3478

SchematicBoardviewBIOS
Board code
820-3478
Revisions
Rev A
Files
3
Updated

Apple iMac A1419 820-3478 is a laptop motherboard used in the Apple iMac A1419.

The catalog has 1 schematic, 1 boardview file and 1 BIOS file for it, posted between 2021 and 2022 across 4 Telegram channels. Each download button opens the original Telegram post.

The files are marked Rev A; other revisions of the same board can differ in parts and layout.

The boardview comes in .BDV and .BRD format. OpenBoardView (free) usually opens these files; FlexBV works too. See OpenBoardView: Installation and First Steps.

With both a schematic and a boardview you can find a net on the diagram and then locate the same part on the board by its reference designator. No Boardview for Your Board? How to Work Without One shows the workflow.

BIOS notes: file names mention 8 MB chip sizes. Read and save the original chip contents before you write anything to it — Keeping the Windows Product Key (MSDM) When Reflashing a BIOS.

Compatible models

Files for Apple iMac A1419 820-3478

Schematics 1 All schematics →

Boardview files 1 All boardview files →

BIOS and firmware 1 All bios and firmware →

Frequently asked questions

Which laptops use the 820-3478 motherboard?
File names in the catalog tie 820-3478 to the Apple iMac A1419. Laptops sold under one model name can use different boards, so confirm by the code printed on the motherboard.
Which revision of 820-3478 do I have?
Files for this board mention Rev A. The revision is printed on the PCB silkscreen, usually next to the board code. Pick files with the same revision when you can; if yours is not listed, the closest revision is usually fine for the schematic but check part positions in the boardview carefully.
How do I open the 820-3478 boardview file?
The boardview for 820-3478 is available as .BDV and .BRD. .BDV and .BRD usually opens in OpenBoardView (free) or FlexBV. See What Is a Boardview File and Why You Need One.
What should I check before flashing the 820-3478 BIOS?
Read the original chip with a programmer and save two copies before writing anything. File names for this board mention 8 MB images; the dump size must match your chip. A dump from another board carries that board's serial number and MAC address, so restore yours from the backup.

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Files are hosted on Telegram by third parties; ExcitingSpas.com only links to public posts. Check that a file matches your board before using it. Disclaimer · Report a file