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Modelo de principios de 2011, A1278 /2.3 GHz i5 o 2.7 GHz con procesador i7.

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MacBook extremely slow and strange power button

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!

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You'll need to run the onboard diagnostics to get a better idea on whats happening. Press the D key after startup to enter into it. Let us know what error codes you get.

Reference: Mac startup key combinations

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@danj Thank you for your reply.

I just did the hardware test and got the following result:

4SNS/1/40000000: IB0R-9.166

What this means? There is some solution?

Thank you very much!

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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!

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@danj Thank you very much for your help.

Yes, I know that, and that's why I bought this logic board to replace the original one, but unfortunately it has this problem. I will try to find someone to repair. Thanks again for your help, hoping this topic will help others.

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I'm confused ?? Which board did you check? You'll need to run diagnostics on the other board if thats the new one if that is failing.

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The board where this diagnosis occurs was on the new replacement plate, since the old one did not turn on (3 beeps), it was not possible to perform this diagnosis.

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Ouch! You'll need to get a 3rd board! This one needs fixing! Can you return it to get a replacement or your money back to get another?

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Unfortunately it is not possible, the deal was made without that possibility. @danj , can you tell me on average how much it costs to repair a board with this problem?

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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.

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Thank you! Great job!

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André Silva estará eternamente agradecido.
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