Chosen Solution
So my iphone had the greyed out wifi issue and after trying everything from resetting wifi networks to hairdryer/freezer nothing worked so i watched a youtube video of a guy who removed his logic board and simply heated up the wifi chip with a heat gun for 90 seconds and his wifi worked. Long story short i tired his method and now my phone wont even turn on. I know I reassembled it all correctly because ive done it a few times before without issues. I wrapped the whole logic board in tin foil (only exposing the wifi chip) and approx focused the heat on the chip for no longer then a minute. Does anyone know of a few ideas of things that couldve went wrong with logic board? Is my phone toast now or is there anything i can try to bring it back to life?
This technique is called Reflow. You must know what you are trying to do, first of all you can’t use an hairdryer or an hotgun, because hairdryer does not spread properly and does not have the C°/F° required for doing a reflow, you can cause several damage on the nearby components. No hotguns because those guns are way too much hotter and as @Josh W said there is no way to know how much really the hotgun temperature is running (you could use it but not in a newbie hands). You need an SMD rework station for doing this job around 280/310 C° (536/590 F°) and a bit of practice. I suggest you to bring your iphone at your local repair shop and the best you can do is to explain every single movement that you did. Sorry for my bad english.
It all really depends on how hot the heat gun was. But lets say that it was hot enough to melt the solder on the wifi chip. Holding heat on the board for 90 seconds would allow the heat to spread to countless chips, filters and fuses. Putting the foil on it would only help the heat spread. There is no way to know what else you cooked without examining your phone under a microscope. Can you link to that video so that I can blast the person who made it? Applying heat for 90 seconds without measuring temp or knowing what parts are heating up is just stupid. Those of us that use hot air to do these kinds of repairs use tips that are measured in millimeters. The heat is applied to only very specific parts and is done in a way that prevents other components from being harmed. If you can post that video, I would really appreciate it.
