At this point I suspect the charging circuit is in trouble (on the logic board).
There are a few MosFET's and a comparator logic that often get burnt. Often you can see them damaged. Look right behind the battery connector there you will find 2 four pin MosFET's (with a larger fifth pin on the other side).
-
== Update ==
-
The SMC is a micro-controller that gets the input from the comparator logic.
+
== Update ==
-
Sure, its possible the SMC is damaged as well.But, you need to work upto it from the battery & charger circuit. I don't remember seeing the SMC fail with all of our systems.
+
The SMC is a micro-controller that gets the input from the comparator logic.
-
Static is the the big killer here. One thing we've discovered is the cases we had used would discharge into the MagSafe connector when the laptop was put in or out.
+
Sure, its possible the SMC is damaged as well. But, you need to work upto it from the battery & charger circuit. I don't remember seeing the SMC fail with all of our systems.
+
+
Static is the the big killer here. One thing we've discovered is the carrying cases we had used would discharge into the MagSafe connector when the laptop was put in or out.
Also with the colder weather moving in, the air gets dry so its also important to be doubly careful when opening systems (using ESD safeguards).
As to testing MosFET's:
+
* [http://homemadecircuitsandschematics.blogspot.com/2012/04/how-to-check-mosfet-using-digital.html|Testing out of circuit]
* [http://www.4qdtec.com/mostest.html|Testing in circuit]
On the most part unless you have the tools, skills and access to the parts this is something you should hand over to a person with SMT skills.
At this point I suspect the charging circuit is in trouble (on the logic board).
There are a few MosFET's and a comparator logic that often get burnt. Often you can see them damaged. Look right behind the battery connector there you will find 2 four pin MosFET's (with a larger fifth pin on the other side).
+
== Update ==
+
+
The SMC is a micro-controller that gets the input from the comparator logic.
+
+
Sure, its possible the SMC is damaged as well. But, you need to work upto it from the battery & charger circuit. I don't remember seeing the SMC fail with all of our systems.
+
+
Static is the the big killer here. One thing we've discovered is the cases we had used would discharge into the MagSafe connector when the laptop was put in or out.
+
+
Also with the colder weather moving in, the air gets dry so its also important to be doubly careful when opening systems (using ESD safeguards).
+
+
As to testing MosFET's:
+
* [http://homemadecircuitsandschematics.blogspot.com/2012/04/how-to-check-mosfet-using-digital.html|Testing out of circuit]
+
* [http://www.4qdtec.com/mostest.html|Testing in circuit]
+
+
On the most part unless you have the tools, skills and access to the parts this is something you should hand over to a person with SMT skills.
At this point I suspect the charging circuit is in trouble (on the logic board).
There are a few MosFET's and a comparator logic that often get burnt. Often you can see them damaged. Look right behind the battery connector there you will find 2 four pin MosFET's (with a larger fifth pin on the other side).