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What is this burned part on my logic board?

I have a 15" MBP a1286 2.66GHz. Today when I plugged it in after not using it for months, and pressed the power button, I noticed that it was getting very hot at the bottom of the case. I unplugged it, took out the battery and pulled the buttom case. I saw that a small chip to the right of the memory slots had burned up. It's indicated by the arrow in the picture below. I'd like to know what this does, and if it indicates a problem elsewhere in the system. If I replace the logic board, will I just cook another one? Also, the cable below that chip was not fully seated.

This is kind of a monster computer that I built from two broken ones, so it's not really a surprise that something like this happened, but I would like to get it going again. However, I don't know enough about the logic board to know if this indicates a problem with some other part that will effect my new logic board if I put one in.

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RoggeSound, just to make it easier, could you post the last three digits of your serial number, or the 820-XXXX number of your logic board? this will help to properly identify your logic board.

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Logic board number is 820-2532-A

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Had this computer (or either of the ones combined to make it) even come in contact with water? It almost looks like there is water damage on it from they way I am looking at it.

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Yes, they were both damaged in a flood, but the part in question was not burned up when I built the computer. Even now, when I plug in the power adapter, I can feel that part getting hot right away.

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RoggeSound, that is part of your PBus Supply & Battery Charger circuitry, reference designator Q7030 which is a Silicon N Channel Power MOS FET RJK0305DPB LFPAK-HF and is available at places like this. Hope this helps, good luck.

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Thanks! I just bought a few of those to try to replace it and maybe save this logic board... logic boards are really expensive if you didn't actually pay for the computer. At least this way I'll only cook a $2 part if this isn't the underlying problem.

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That's the way I like to look at things. If it is only a few $$, why not try;-) thanks for accepting my answer.

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RoggeSound will be eternally grateful.
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