Chosen Solution
Hello everybody, I have a very esteemed macbook late 2011. The logic board had a problem with the detection of the ram memories (3 beeps), which was not repairable so the only solution is the replace of logic board. I managed to get a board of a macbook 2011 early version. I replace the board with very carefully, apparently without any problem and I took the opportunity to change the thermal mass of the processor. When I try to turn on the computer, I notice that the first strange symptom was that for it to turn on, I had to leave my finger fixed on the power button for about 5 seconds. If I only clicked once, as it should be, I would hear the computer trying to connect but then it would go down. When he finally turn on i notice that is extremely slow, to the point of not being usable. I started in safe mode and it worked at normal speed. Another thing I noticed, is that I can’t reset the SMC. When I do the key combination + power button, the computer wont turn on. Will these problems all have the same origin or will they be several problems? Do you suggest a solution? Thank you all!
Your logic board has a power rail problem! Thats what IBOR is a current sensor. You’ll need to find someone with the deeper skills to fix your logic board or you could just replace it. Sadly these boards (2011/2012) are getting hard to find used as people are hanging on to their systems as this series is the last model which is really serviceable RAM & storage!
I have a same A1278 macbook pro 13 with the same problem. You have to push the power button all the way for 5-6 seconds to make it turn on. Just take down those 2 resistors and make 2 direct connect jumper wires and the problem is solved. The problem is caused by those 2 faulty resistors so the ISL6259 charger IC can’t measure the battery current.
