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Power failure to logic board

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Hi, i recently bought a second hand MacBook Pro a1260 and i used it for only a few hours before it started failing to boot. Black screen fans and disk spinning but nothing else. I took out the logic board and the CPUs were not clean or pasted properly so i cleaned them up and put new thermal paste on and i got several more hours of boot time. Today it died again and I have isolated the problem to a bad connection on the ic chip to the right of the memory (f2116bg20v h8s) it looks like this processor has a weak connection if i lift the rhs of the chip the system boots fine. Is there anyway i can fix this or does this mean a new logic board? Last digits of serial number are z3ja

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[image|335200]

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Thanks guys for your help. I will look into getting it repaired one way or another.. Just for reference dan :) "he" is a "she" :)

OT would a hot air gun help reflow the chip or does it need to be completely reballed?

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S3r3n31, thank you for accepting my answer. You could try a reflow with a hot air gun. Really, nothing to lose at this point. Just make sure that you shield all the other nearby components from the heat. There are a couple of good youtube videos, something like this, that may help you. Just remember the objective is to soften the solder, not to liquify it:-) Best of luck to you.

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S3r3n31, that is reference designator U4900 which is your SMC H8S 2116IC. The H8S/2116 Group which is required to configure the system and the peripheral function. A reball should fix it. Hope this helps, good luck

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Thanks OT! - If the image is the chip in question, then I stand corrected. From his description I had thought it was the South Bridge he was pulling on.

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Sounds like you have a cold solder joint on the South Bridge interface chip.

Do you or a friend have the needed equipment to handle SMT components? If you do you could try re-floating it. This is a very advanced project and may fail.

Otherwise, sorry to say I would try to get your money back, or look into getting a new logic board.

Apple no longer services this model, but some authorized service centers still do (and may even have the needed parts in hand).

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This may also be the infamous nVidia 8600 GPU problem. Hook it up to an external monitor, if you get a picture, I'm wrong.

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Thank you for your quick response! Yeah it's not a problem with the gpu I checked. I have tried getting my money back and the gentleman who sold me the unit told me it was caused by a software install :/ he's refusing all responsibility. I knew it wasn't which I have gone to great lengths to figure out the problem.

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S3r3n31 will be eternally grateful.
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