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Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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Water damaged logic board post cleaning

Hi everyone, I have a water damaged MBP 13" late 2011 and what sucks is I have AppleCare until 2015 Being a poor uni student I can't afford to purchase another laptop, so I pulled out the logic board (820-2936-B) and cleaned it with 100% ethanol and a toothbrush.

When I put it back together and plugged in the magsafe charger, the light turned green! Great I thought, but instead of trying to turn it on I plugged the battery back in and to my horror two components (circled red in the photos) started smoking and glowing RED hot! Needless to say I immediately unplugged the battery. But now the magsafe light only glows a very dim green and the MBP won't turn on.

I've attached photos of the logic board with the burned components, is anyone able to identify them? The top one I think is a capacitor and as you can see in the photo the surrounding PCB is glossy from the heat. The lower IC chip got so hot it bubbled and bits flaked off.

Is it at all possible for me to purchase and replace these two components? As I think the logic board is in very good condition otherwise, the corrosion wasn't very serious.

Thank you very much in advance, any help would be much appreciated!

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Have you tried going to the Apple Store playing dumb? You could get lucky here ;-} Remember your girlfriend used your computer and you don't know why it doesn't turn on now. You smelled something burning and brought it in ...

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Hi Dan, thanks already tried that. Apple store refused repair due to liquid damage and AppleCare doesn't cover it :(

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Ouch! Sorry ;-{

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@sabrinachristal - How about reading the question & all of the posts before commenting. Not everyone is so adept working on SMT components as you appear to be. Most people posting questions here are not as skilled as you think.

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vaprx, besides all the great points that Dan made, I do feel you should at least know what those components are. May be you can get someone to solder those for you, if you do not have the right tools, or if your skills are not quite up to par with that. You are right in your assumption about the first component. It is reference designator C3892. It is a 4.7UF 10% 10V X5R 805 capacitor. Readily available at places like this cost is around $0.54.

The second component is a bit trickier. It is reference designator U9410 and is a TPS2590 QFN 3-V To 20-V High-Current Load Switch. Here is the datasheet for that. It is available at places like this as well as on here. Cost for this is around $2.54. I am sure they are available at other places as well. Just remember that these will require the proper tools as well as excellent soldering skills to replace. Hope this helps, good luck.

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Before you replace the the chip you burn't you'll need to figure out why is burn't otherwise you're likely to burn up the replacement.

The best way moving forward here is to find a replacement logic board and just swap. Thats assuming the fault is somewhere on the logic board.

As to replacing the chip, yes, with the proper tools and skills you can replace it (and access to the part). Unless you have done a lot of soldering of these small SMT devices I would recommend trying to find someone to do it for you. You might find someone local or you can sent it out to one of these folks if you find someone online. Knowing your limits here can save you from destroying your logic board if you go this route.

Make sure the rest of your system is OK and you don't have something a miss with it.

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vaprx will be eternally grateful.
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