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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). If you intent to do just a reflow you will definitelly need apropriate flux to be injected under the GPU. errors 134 Repeat sp, th, pl, str, awk 178 Copy pa, an, pro, pre, sti 179.
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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). Search: Imac Black Screen On Startup Chime. A looping three times beeps during startup is a signal from your MacBook to tell you that the operating system youll boot into is incompatible or even fails to.