Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Cannot reset SMC, battery not charging to 100%

I got the battery replaced in my 13" MBP probably about a year ago, and now again it's showing some of the same symptoms.

If I unplug the magsafe power adapter, and plug it back in, no light comes on at all. So I'll try to perform SMC reset - and absolutely nothing happens. I mean that nothing happens when I try to reset the SMC - it just won't go through.

The only way I can get the light to turn back on on the adapter is to take the back off, and disconnect the little ribbon that is plugged in. After about 5 seconds, the light comes on and I'm fine as long as i keep it plugged in.

Also the battery will not charge to 100%, just stays at 90.

Here is some info:

Hardware Overview:

Model Name: MacBook Pro

Model Identifier: MacBookPro5,5

Processor Name: Intel Core 2 Duo

Processor Speed: 2.53 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache: 3 MB

Memory: 8 GB

Bus Speed: 1.07 GHz

Boot ROM Version: MBP55.00AC.B03

SMC Version (system): 1.47f2

Serial Number (system): W89428J066E

Hardware UUID: AB8F6457-929C-5FAE-BCED-9541CCCFC409

Sudden Motion Sensor:

State: Enabled

Battery Information:

Model Information:

Serial Number: W02314AKVD3LC

Manufacturer: SMP

Device Name: bq20z451

Pack Lot Code: 0

PCB Lot Code: 0

Firmware Version: 201

Hardware Revision: 000a

Cell Revision: 165

Charge Information:

Charge Remaining (mAh): 3987

Fully Charged: No

Charging: Yes

Full Charge Capacity (mAh): 4440

Health Information:

Cycle Count: 191

Condition: Normal

Battery Installed: Yes

Amperage (mA): 1381

Voltage (mV): 12520

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1 Answer

Nothing will outwardly happen when the SMC is reset correctly. Here's how to do it correctly:


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I've had to reset the SMC before and this "Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC." always happened. It hasn't happened any of these times and isn't fixing the problem.


Run Coconut Battery and let us know your results. Is this an Apple Battery or a knockoff? http://www.coconut-flavour.com


If it's knockoff I'll be very angry - I got it replaced at the Mac Store not too long ago. Long enough that the extra year warranty has already ceased.


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Jake will be eternally grateful.
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