On coils L7310 and L7320 I measure 0.0V, but I could swear I saw once 1.7 V (after many charger plugging/replugging) PP3V3S0_EN = 3.23V (there is enable on U830, but the chip is removed in previous repair). PP3V425_G3H = 3.42 V (also indication on the charger). I have performed some measurements on the board and this is what I have: When charger is conencted to the board there is a green light which soon becomes orange and fan starts working at full speed. Logic board is removed from teh laptop and it is conencted only with I/O board (because of charger). After visual inspection I cannot determine if something else is removed but it seems not.įirst of all, is it possible Macbook Air to work without U8030? The load switch U8030 was desoldered and removed from the board. When I opened laptop, I noticed that the board is very clean with tiny trace of corrosion (green) on one place on the board and what I noticed immediately is that there was some kind of previous repair attempt.

When plugged charger laptop starts with very loud fan noise but no chime and no POST and image. The customer said that it was working fine until it failed to update from Catalina to Big Sur. So, I have on my desk Macbook Air A1466 EMC2925, Early 2015 with faulty motherboard. I watched many youtube videos from Louis Rossmann channel, so the concepts are clear to me. I do have limited experience with repairing PC laptops. First of all, I have virtually no experience with repiring macbooks and this is my first one with faulty logic board.

Early 2015 macbook air logic board