Details:
- MBP Early 2011 13" (820-2936)
- A few days back after connecting with power adapter fan would just pulse, and HDD would keep clicking. CPU and PCH would decently warm, but not really hot hot. But not anymore, it's all just cold. SMC was reporting temperatures but fan would move randomly (very rarely) even when I had set it at base 2000rpm.
- Logic board is in pristine condition never had a liquid spill and on inspection there does not seem to be any signs of moisture corrosion as well. no signs of any burnt part as well.
- No green light on connector.
All the following readings are with adapter only, no battery connected. However when connected with battery PPBUS_G3H goes up to 10.6V which is perhaps not sufficient to kick start it.
PPBUS_G3H 0.30-0.40V
PPDCIN_G3H 16.54V +- 0.02
PP3V42_G3H 3.48V +- 0.01
PPVRTC_G3H 3.48V +- 0.01
PP5V_S5 0V
PP5V_SUS 0V
PP5V_S3 0V
PP5V_S0 0V
F7040 - Good
C7085 - pin 1 16.54V pin 2 11.26V (470K Ohms)
R7085 - V values same as C7085
Q7085 - pins 1,2,3 16.54V pin 4 11.27V pin 5 0V (should be 16.54?)
R7010 - Kaput (1.1K ohms, variable; voltage on 1 is 16.62 on 2 is 0V)
R7011 - Kaput (variable resistance)
C7002 - pin1 3.48V pin2 GND (Good?)
R7001 - 8.3ohms pin1 5.11V pin2 5.10V
R7005 - 49.4ohms pin1 16.30V pin2 16.23V
R7015 - fluctuates 97K-103K ohms
R7016 - 2.98K ohms
R7013 - Missing but empty pads have 803 ohms (supposed value of r7013 is 1K)
R7012 - 963 ohms
R7000 - 0 ohms
SYS_ONEWIRE - 0.06V +- 0.01
SMC_BC_ACOK - 0.06V +- 0.01
SMC_RESET_L 0V
From above readings it is fair to say that R7010 and R7011 are kaput. How do I check if ISL6259 and SMC are also kaput? Since PPBUS_G3H is missing would it be ok to inject 12.8V on that bus and see if this thing fires up or would that be too dangerous to perform and risk the board? I am a s/w engineer and once a proper diagnosis is done would have to take it to someone who can work on it. The small/mid-sized town in India I live in has very few experts who work on Apple machines. Apple care have already raised their hands saying they cannot work on this machine since it's a vintage and they might not be able to find parts for it. Other local repair shops seem to be at loss when looking at the board and hence the reason I decided to self-diagnose it.
How should I move forward from here on to fix this machine? Any and every input would be highly appreciated! Thanks much in advance!
- MBP Early 2011 13" (820-2936)
- A few days back after connecting with power adapter fan would just pulse, and HDD would keep clicking. CPU and PCH would decently warm, but not really hot hot. But not anymore, it's all just cold. SMC was reporting temperatures but fan would move randomly (very rarely) even when I had set it at base 2000rpm.
- Logic board is in pristine condition never had a liquid spill and on inspection there does not seem to be any signs of moisture corrosion as well. no signs of any burnt part as well.
- No green light on connector.
All the following readings are with adapter only, no battery connected. However when connected with battery PPBUS_G3H goes up to 10.6V which is perhaps not sufficient to kick start it.
PPBUS_G3H 0.30-0.40V
PPDCIN_G3H 16.54V +- 0.02
PP3V42_G3H 3.48V +- 0.01
PPVRTC_G3H 3.48V +- 0.01
PP5V_S5 0V
PP5V_SUS 0V
PP5V_S3 0V
PP5V_S0 0V
F7040 - Good
C7085 - pin 1 16.54V pin 2 11.26V (470K Ohms)
R7085 - V values same as C7085
Q7085 - pins 1,2,3 16.54V pin 4 11.27V pin 5 0V (should be 16.54?)
R7010 - Kaput (1.1K ohms, variable; voltage on 1 is 16.62 on 2 is 0V)
R7011 - Kaput (variable resistance)
C7002 - pin1 3.48V pin2 GND (Good?)
R7001 - 8.3ohms pin1 5.11V pin2 5.10V
R7005 - 49.4ohms pin1 16.30V pin2 16.23V
R7015 - fluctuates 97K-103K ohms
R7016 - 2.98K ohms
R7013 - Missing but empty pads have 803 ohms (supposed value of r7013 is 1K)
R7012 - 963 ohms
R7000 - 0 ohms
SYS_ONEWIRE - 0.06V +- 0.01
SMC_BC_ACOK - 0.06V +- 0.01
SMC_RESET_L 0V
From above readings it is fair to say that R7010 and R7011 are kaput. How do I check if ISL6259 and SMC are also kaput? Since PPBUS_G3H is missing would it be ok to inject 12.8V on that bus and see if this thing fires up or would that be too dangerous to perform and risk the board? I am a s/w engineer and once a proper diagnosis is done would have to take it to someone who can work on it. The small/mid-sized town in India I live in has very few experts who work on Apple machines. Apple care have already raised their hands saying they cannot work on this machine since it's a vintage and they might not be able to find parts for it. Other local repair shops seem to be at loss when looking at the board and hence the reason I decided to self-diagnose it.
How should I move forward from here on to fix this machine? Any and every input would be highly appreciated! Thanks much in advance!