ytesfay80
Member
I got this 17" 2011 MBP sent from another repair shop with this note.
"Magsafe adapter fades to black after a few seconds and the device won't power on. Tried SMC bypass with no luck. Replaced dc board but still the same symptoms"
When I initially plugged in my charger the fans started spinning and the magsafe light was bright green. After a second or two the fans stopped spinning then they spun again and the machine chimed and booted and I was able to login and play with a few things like internet and camera. The battery was charging then all of a sudden it stopped charging and the magsafe light went dim and soon after it shut down and I haven't been able to get it back on.
I am using a genuine Apple 85w charger.
I've tried plugging in 2 other 820-2565 magsafe boards(not sure if there compatible) and still the light is dim green.
When I take a look at the logic board I can see discolored probe points as if there was liquid damage that got cleaned up. Some by the SMC(U4900)
PP3V42_G3H - 3.45v'
SMC_RESET_L - fluctuates quickly between 2.9v to 3.4v
PPBUS_G3H - 0.48v (With battery and charger plugged in 10.4v)
Pins1/2 of U6901(SMC_BC_ACOK) - 0v
Pin 5 U6900 (Adapter Sense) - 0v
Pins 19/20 of U7000 (VDD Pins) - 2.5v (R7001 measured proper resistance)
Resistance Pins 17/18 - 3.6ohms - Pins 27/28 - 21ohms
Shouldn't that be 5.1v and where is it created? I believe in the newer schematics that is created by the 3v42 circuit
"Magsafe adapter fades to black after a few seconds and the device won't power on. Tried SMC bypass with no luck. Replaced dc board but still the same symptoms"
When I initially plugged in my charger the fans started spinning and the magsafe light was bright green. After a second or two the fans stopped spinning then they spun again and the machine chimed and booted and I was able to login and play with a few things like internet and camera. The battery was charging then all of a sudden it stopped charging and the magsafe light went dim and soon after it shut down and I haven't been able to get it back on.
I am using a genuine Apple 85w charger.
I've tried plugging in 2 other 820-2565 magsafe boards(not sure if there compatible) and still the light is dim green.
When I take a look at the logic board I can see discolored probe points as if there was liquid damage that got cleaned up. Some by the SMC(U4900)
PP3V42_G3H - 3.45v'
SMC_RESET_L - fluctuates quickly between 2.9v to 3.4v
PPBUS_G3H - 0.48v (With battery and charger plugged in 10.4v)
Pins1/2 of U6901(SMC_BC_ACOK) - 0v
Pin 5 U6900 (Adapter Sense) - 0v
Pins 19/20 of U7000 (VDD Pins) - 2.5v (R7001 measured proper resistance)
Resistance Pins 17/18 - 3.6ohms - Pins 27/28 - 21ohms
Shouldn't that be 5.1v and where is it created? I believe in the newer schematics that is created by the 3v42 circuit
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