Chosen Solution
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
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
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).
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.
