Recent content by alex12347425

Checked with oscilloscope, it is not longer. Same 200ms. I think fans just starts with max speed during SMC bypass and that gave me wrong impression that it works longer. I checked PPVCORE_S0_CPU with oscilloscope, voltages goes to 1.2v for 50ms than slowly discharges back to 0. Are you sure...

Hm. Thanks for the suggestion. I tried to connect charger while holding power button and now it behaves differently. It still does not work, but fans spins much longer and now I see activity from U7400, so seems my suggestion that U7400 is bad was wrong. But it still does power cycles every 5s

I worked with it on desk when nothing is connected (only charger). 1 time board started (fans starts to spin), but after reconnecting the charger, it is same again. It is first time I hear about SMC bypass, what is the right procedure? Should I connect keyboard and keep power button for...

Hm, after some more playing I found that U7400 is not starting. It is strange as I think I saw vcore before. Now it is just off. MAX15119GTM receives power and EN pin but does not trigger mosfets and does not output PGOOD. That I think the reason it stays in power cycle.

Hi smart guys Recently I spilled beer on my old macbook and now want to fix it. I am a hardware designer and dont do repairs, so no experience in troubleshooting. Please, help me with it. So A1425 13 inch Macbook Pro Retina. It was on when I spilled bear and it immediately shut itself off...