Once you opened you have to apply thermal paste this what caused to not boot up and shut off right away also try screwing the two screws tight with the metal bracket is important
Gosh Oldturkey always invading my support! anyways get the following items in your local hardware store. (1) Wire stripper (2) Shrink tube (3) basic solder iron (4) solder lead (5) patience (6) lighter Do it like this video but when you cut the wire like my picture insert the shrink tube first once all the wires are connected and solder you can align the shrink tube in the middle of the wires and use the lighter to shrink it instead of the electrical tape like the video https://m.youtube.com/watch?v=QswQCQqEJ5...
Bro l can’t believe I just read all that lol I’m a former apple employee I quit because of this kind of acts I had to hear and tell customers so our location can reach target sales you should be mad at the head manager anyways. I recommend just taking it to a local repair shop that can also fix logic boards try to get the screen replaced just tell them if they can test a new screen first they shouldn’t charge you for that. If the symptoms are the same is a logic board problem.
Lol cmon guys stop scaring the new people you can still use it as long as you can get to the home screen I recommend using R-sim and don’t use whatever carrier they had for example AT&T blacklisted you can use T -mobile or other carrier as long is not AT&T. Purchase a R-Sim and for the right IOS and don’t update the iPhone and you will be good bro! 15 years in cellphone experience bro! You can trust me