alex12347425
New member
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. Took me about an hour to get to home and teardown. I was surprised how much of green corrosion grew for such short time, most of corrosion was around INA current sensors and mosfets at top part of pcb (where air vents), some around components around smc but not much. After cleaning pcb visually all is ok and not much damage. I found a broken connection on one of INA, but no changes after fixing connection. I checked U5410 and U5400 where were most of corrosion and I see with osciloscope that they works fine. I also checked a few voltage sense circuits to make sure their signals goes all the way to smc.
No boot.
Green light on charger than switches to amber(no battery connected)
PPBUS_G3H - 12.56V
SMC_RESET_L - 3.09V (when I measure it in diferent parts of pcb I see slightly diferent voltage)
PP3V42_G3H - 3.4V
PPV5_S5, PP3V3_S5 and other S5 and G3Hs are good and present.
All others S0..S4 powerails are off but jumps to designed voltage every 5s for a 200ms pulse.
I did not spot any damage component or short.
For me it feels like SMC tries to go to S0 state, but senses wrong voltage/current and shuts everything off, than cycle repeats in 5 seconds. Or it is indeed has a short circuit on one of sub rails.
Any ideas what to check?
Thanks in advance.
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. Took me about an hour to get to home and teardown. I was surprised how much of green corrosion grew for such short time, most of corrosion was around INA current sensors and mosfets at top part of pcb (where air vents), some around components around smc but not much. After cleaning pcb visually all is ok and not much damage. I found a broken connection on one of INA, but no changes after fixing connection. I checked U5410 and U5400 where were most of corrosion and I see with osciloscope that they works fine. I also checked a few voltage sense circuits to make sure their signals goes all the way to smc.
No boot.
Green light on charger than switches to amber(no battery connected)
PPBUS_G3H - 12.56V
SMC_RESET_L - 3.09V (when I measure it in diferent parts of pcb I see slightly diferent voltage)
PP3V42_G3H - 3.4V
PPV5_S5, PP3V3_S5 and other S5 and G3Hs are good and present.
All others S0..S4 powerails are off but jumps to designed voltage every 5s for a 200ms pulse.
I did not spot any damage component or short.
For me it feels like SMC tries to go to S0 state, but senses wrong voltage/current and shuts everything off, than cycle repeats in 5 seconds. Or it is indeed has a short circuit on one of sub rails.
Any ideas what to check?
Thanks in advance.