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

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Liquid damaged MBP -- can I solder this corroded chip? (see pics)

My brother in law gave me a sugary liquid damaged mid 2009 13" MacBook Pro he's had sitting around for a while. The unit doesn't power on (he said it did for a week or so after the spill, and then stopped)

I disassembled the unit and replaced the DC-In board, and while I was in there, noticed the pictured chip was corroded and rusty. I cleaned it with a toothbrush and 90% isopropyl alcohol, but the unit still doesn't power on.

Pardon the ignorance, but I don't know much about soldering / chips. It looks like the chip was originally connected to the board in four places, but one of the connections corroded away and is completely gone. Can I just add some solder to restore the connection?

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daniel, that "chip" is reference designator Q7001 and it is a HAT1127H P channel power MOS FET. It is part of the PBUS Supply/Battery Charger circuitry, so plausible that it is responsible for your computer not starting. I know that is not what you asked, but it may come in handy if you have to replace it. Yes, you could try and solder the corroded pin back to the logic board. Make sure that you clean the area first and use some flux for some more cleaning. Not the easiest and it will take some skills, but it can be done. If it does not work, do not continue to try (but I don't know much about soldering / chips;-) since you may shorten other areas with to much solder. Hope this helps, good luck.

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I just swapped the battery from my wife, who has the same model, and the machine now powers on and runs normally. It recognizes when a power adapter is plugged in, and will run off of the power adapter only (and off of the known good battery), but the known good battery isn't charging. The battery menubar icon displays "Battery Is Not Charging". Coconut Battery recognizes the battery and was able to give me charge cycle info, etc.

Does the MOS FET control power in general, or only battery charging? Should I continue looking into the MOS FET, or elsewhere?

Thanks!

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Thanks oldturkey03! Is the component something that I can simply replace? I see that they're only about $5 online.

If I plug the power adapter in, the solid green light on the MagSafe connector lights up, and (regardless of whether or not it's plugged in) the battery level indicator on the side of the unit shows a single blinking LED, which indicates to me that there's at least something going on in there -- the machine isn't totally dead.

Any suggestions as to what to do? If it's at all salvageable, I'd love to get it up and running.

Thanks a million!

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The price is about right and before doing anything else, you do want to fix the known error. Remember the MosFet is part of that particular circuit. I'd give it a shot and solder it back on. If that does not work, replace it and reevaluate.

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