Hello,
I am doing repair for Macbook Pro A1278 (APPLE A1278 820-2936-A).
These are the sympthoms:
1. when turn on the macbook i have to push the power button until the chimes sound if not it can not be turn on.
2. after turn on the macbook is very lagging. so when i check the activity monitor it shows kernel task over 300%.
So i tried some action:
1. reinstall the mac os x -- nothing changed
2. change the battery -- nothing changed
3. take out all the connector (wifi, speaker, dvdrom) -- nothing changed
4. try to safe mode boot - kerner_task below 50% and no lagging.
5. try to do AHT -- shows error 4SNS/1/40000000:IB0R-9.166
6. smc reset and still nothing.
The code seems to be for Sensor for current battery or something, "I" current, "B" for battery i think. I know how to take capacitors and stuff like that off, and changing them, just i need to know where to start looking.
I only want to know where in schematics i need to look.
I have all the tools and basic knowladge.
Thanks
P.S. this macbook pro has no water damage.
I am doing repair for Macbook Pro A1278 (APPLE A1278 820-2936-A).
These are the sympthoms:
1. when turn on the macbook i have to push the power button until the chimes sound if not it can not be turn on.
2. after turn on the macbook is very lagging. so when i check the activity monitor it shows kernel task over 300%.
So i tried some action:
1. reinstall the mac os x -- nothing changed
2. change the battery -- nothing changed
3. take out all the connector (wifi, speaker, dvdrom) -- nothing changed
4. try to safe mode boot - kerner_task below 50% and no lagging.
5. try to do AHT -- shows error 4SNS/1/40000000:IB0R-9.166
6. smc reset and still nothing.
The code seems to be for Sensor for current battery or something, "I" current, "B" for battery i think. I know how to take capacitors and stuff like that off, and changing them, just i need to know where to start looking.
I only want to know where in schematics i need to look.
I have all the tools and basic knowladge.
Thanks
P.S. this macbook pro has no water damage.
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