macbook air m4 13" A3240 821-05409 5v

[yair37]

another air 5v case..this time is m4 13" water damage all the board look very clean, LDO ALL OK.
PPBUS_AON 12.2 STABLE
All the secondery voltage pulsing every few secound. no short no board.
CHGR_SYS_5V also pulsing.
CHGR_CSI_FILT_P 5v stable.

 

[2informaticos]

Isn't your board 820-03597?
However it is not available; what schematic using?

 

[yair37]

see it here:
The 2025 MacBook Air M4 (13-inch, Model A3240) logic board generally uses part number 821-05409-02. These M4 models (13" A3240, 15" A3241) feature soldered memory and SSDs, and they require a paired Touch ID sensor with the replacement board.

MacBook Air M4 (2025) Board Details:

• 13-inch (A3240): Board Number 821-05409-02.

But you right...the board is 820-03597 (Why don't they engrave on the board anymore).
Im using m3 board its very similar..so..