Chosen Solution
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
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
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.
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.
