Re: Macbook Pro Retina 13” 820-3476-A (A1502) - missing PM_SLP_S4_L



The board is removed from the laptop, so the Trackpad was disconnected while taking measurements.

The owner of the macbook tells me that a while ago, he had a similar problem (no power and he heard a clicking noise) he took it to another shop and they had his logic board replaced.

Before replacing the logic board on the other shop, he says, the OS was reporting the battery [B]'was in bad condition and that it needed to be replaced soon'[/B].

After the...

Re: Macbook Pro Retina 13” 820-3476-A (A1502) - missing PM_SLP_S4_L



U7501:
Pin 22 = stable 3.3V / Resistance to ground ≈4MΩ
Pin 29 = cycling between 1.5-5V / Resistance to ground ≈2MΩ
Pin 23 = stable 12.57V...

Re: Macbook Pro Retina 13” 820-3476-A (A1502) - missing PM_SLP_S4_L



PPBUS_G3H is a steady 12.57V...

Re: Macbook Pro Retina 13” 820-3476-A (A1502) - missing PM_SLP_S4_L

Hello guys, greetings from Mexico and a Happy new year to all of you!


I'm having trouble with a 820-3476-A that suddenly decided not to power-on (no liquid damage or anything like that).

I'm seeing similar symptoms as the ones described on this thread (No power, but charger light is present), also, I can hear a clicking noise on the board, which seems to be coming from Q7520 (I assume that's where the noise comes from, since after inspecting under a thermal camera, temperature...