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

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No power after install of new battery

I just installed an Apple certified battery into my mid-2009 MacBook Pro 13" (A1278). I've done it before without issue on another machine, but this time when the new battery was put in and everything else was reassembled, there was no power. I could not turn the machine on, the magsafe does not light up, and SMC reset does not work. I returned to my old battery and ended up with the same issue. I'm at a loss.

I found a thread where there were instructions to unplug the battery, hold down the power button, plug the mag safe in and then plug the battery in and the machine would power on. This has worked. The magsafe isn't even plugged in and it's on but the fan is running at full speed and there is no battery indicator in the menu bar.

I don't know what to do since the old battery suddenly didn't work either.

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I was able to turn the machine on and off using the posted method, but because I had no battery indicator, the mag safe isn't lit, and the fan runs full speed, I did an SMC reset and now I cannot power it back on at all.


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Missing pullup resistors on data line because of long nails. It sucks that popular culture dictates females have longer nails. :-( Nails that are more likely to rip R5280 & R5281 off the board while replacing the battery. Check there. This is what we hope for. You'll need to find the 820 number of your motherboard to find a schematic and a boardview to find out where these are; you'll find these numbers near the wifi/webcam cable.

That's what you want to HOPE happened :-)

If you didn't rip resistors than you shorted 12v from the battery to the smbus_smc_bsa_scl and smbus_smc_bsa_sda lines when you bent the pins putting the new battery in. Sending 12 volts to the SMC will instantly fry the most important chip in the machine, which is also the most difficult to replace properly. If that happened, without extensive knowledge of BGA rework this board is now trash. :-(

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Jessica estará eternamente agradecido.
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