Hi.
Just to let you guys know... Those repair methods WILL NOT LAST LONG. Any attempts of repair with blow torch or heat gun (god bless those logic boards) are UNACCEPTABLE! You will get you Mac fixed for a short time, but then only replacement will help. It's better to get it to TRUSTED workshop for professional REBALLING or if you looking for permament fix whole NVIDIA chip replacement. BUT IF YOU PLAY WITH HEAT GUN OR BLOW TORCH the repair will be impossible at all... It's funny that you can afford £1500 for a Macbook Pro, but then trying to save £100 for professional repair ruining whole machine. Think twice. You will save money anyway. I have repaired tons of motherboards with NVIDIA/ATI/Intel GPUs, but those with signs of previous DIY attempts will almost always fail. PATHETIC