Please help me identify this component?

I'm working on this MacBook Pro that had water damage. It actually boots up and seems to work pretty good. I just have one issue that I've found...the left shift key does not work. All other keys do. The keyboard has been replaced already with the same symptoms with both keyboards.

While searching for anything on the board that might be the problem I came across some missing & damaged components. I compared them to another board I had and found the markings 2N on it and it's got 3 pins on each side. I also need to figure out where I can find the black capacitors (I think that's what they are) near it.

Hear are two pics. One shows the damage and the other shows the good board.

Any help would be greatly appreciated.

Logic board serial number: D92FF1NMDH2G

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stevelporter, the number for your board is actually a LB 820-2936:-)

the components are as follows:

reference designator Q5300 is a NTUD3169CZ Small Signal MOSFET in a SOT-963 package

reference designator R5301 is a 100K 1/16W 1% resistor in a 402 package

Both components are part of the PBUS Voltage sense enable circuitry

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OLDTURKEY...you are a lifesaver! Thank you so much.

Where do I find the number for my board? I was going off of the serial number printed on the RAM carrier.

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It should be stenciled on your board itself. check for a 820 number. BTW you are welcome....

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I'd be willing to bet that that component isn't what went bad in your machine. Before attempting a risky and difficult repair on a board that (for the most part) probably works, look into replacing the top case or repairing the keyboard. You shouldn't have too much difficulty popping the shift key off, just remember not to use excessive force, that's your worst enemy when working with these things. From there you can remove the key mechanism and clean things out. That may be all it takes. If that doesn't work, you can also replace the top case, iFixit sells it here and you could also probably find it from other vendors as well, probably without the same warranties though. As a side note, I've never worked on these machines but it may be possible to separate the keyboard from the top case and replace just that. It would definitely be cheaper but someone with more experience might be able to give some better insight than myself. It looks like just the keyboard assembly is available on eBay if you want to pursue that option.

MacBook Pro 13" Unibody (Early 2011/Late 2011/Mid 2012) Upper Case Image

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Thanks for your comment. I'm 99% sure the keyboard is fine. At first I thought that MAYBE it was the keyboard so I replaced it just to check. The second keyboard also does the exact same thing.

What I really need is help identifying these components. I can guarantee that these components did go bad since several of the pins are completely gone as are the black resistors/diodes or whatever they are.

Replacing these may not fix the problem with the keyboard, but they obviously need to be repaired.

Any idea what they are?

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I hate to say it but it isn't going to be easy to identify these components. Your best bet would probably be to buy a dead logic board on eBay and get the components from that, since most of them are unlabeled and schematics for these boards don't exist in the public domain (at least to my knowledge). I still think it's a big risk replacing them to regain the shift functionality though, so be very careful if you choose to proceed.

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Ya, I know they will be hard to identify but I figured some of the Mac gurus on ifixit might know.

I know I may have to buy another board to get the parts, I just wish I could get my hands on just the part. I've done board level repairs (like replacing the display cable connector) on these before but I just need the part.

Maybe someone else will be able to help.

BTW, I refurbish these to re sell so I would love to be able to have the shift function working.

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To test it to see if it is the keyboard or the logic board use an external USB keyboard, almost any will work. I agree with Chris it probably the keyboard. If the right shift key works, you might be better off just living with it. Most of the 13" keyboards after the 2009 model do have replaceable keyboards. It lots and lots of screws (about 64). I use an electric screwdriver to remove the screws and can generally replace a board in an hour and fifteen minutes, so it's well worth the savings over replacing the uppercase.

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Thanks for your reply! I've already tested and replaced the keyboard. It's not the keyboard...even if it was these other parts still need to be replaced.

Any idea what they are?

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