There is also CS-FLUX which seems to be flux specially designed for BGA rework by a laptop repair workshop. Amtech flux is very good for this job but quite expensive (on ebay most Amtech flux that is offered for under 25$ from China is low quality Chinese copy).
A day later however the problem returned. Does the beeping come back It may be fine for some while depending on how long you have been on battery power. I knew this could be a RAM issue, so I reseated the RAM, after which it booted fine again. Does the beeping stop If the computer is thinking it is swapping from the power supply to the battery and back again, this ought to fix it in one state. Wonder why your Macbook Pro makes a beeping noise when you try to power on This video will explain why and a possible easy repair fix. It used to work fine, but all of a sudden when I tried turning it on one day it wouldn't start up and give me three beeps. If you intent to do just a reflow you will definitelly need apropriate flux to be injected under the GPU. MacBook Pro won't start and beep three times sometimes Hi, I have a MacBook Pro 15' from 2010.
A reflow (heating of the solder balls under the GPU at around 250 degrees) could fix the problem temporary but in order to have a permanent result you need to remove the GPU and replace the solder balls (reballing).
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