Ok guys, error -1 is an error where your baseband can't connect to the cpu. For those who don't know, there is a big brain (cpu) for the majority of the phone and a little brain (baseband cpu) just for the cell network. Typically the problem is caused by a cracked solder joint somewhere due to a drop or jolt. When you heat or cool anything on this earth, it changes in size ever so slightly. Heat expands the object and cooling shrinks it. So either way you go you are shifting the chip ever so slightly and the micro crack touches again and you get a working device. However once it returns to normal temp the crack will reappear. The most obvious spot to crack is under the baseband cpu or the big cpu. This is because the solder contacts are the smallest on the phone here and have very little yield strength to resist a jolt or drop. If Apple didn't use underfill (a water proofing black tar) on the chips you could just throw it in a reflow oven to fix, but they do. The only correct fix therefore is to remove and...

Ok guys, I repair boards and can shed a little light that might help. First off the black tape can matter so change it all. What is important is the tape on the back of the plugs the most. It serves a dual purpose of helping with a mechanical connection and anti static. The other black tape may help (back of rear cam, backlight tape, and tape over flash bracket) but prob not. Also the bad battery or heating battery doesn't cause issues, its the heating board. Excess heat causes resistance to any circuit. Another thing to remember is to always disconnect the battery when doing a screen. There is voltage in the plug pins and when your sliding the plug in it could short that voltage to the pins next to it. Turning the phone off before disconnecting the battery shouldn't matter though. Finally what no one wants to hear is that it could be your touch chip on the board. There are 2, one goes bad and causes zebra lines and no touch, the other causes no touch and ghosting. There are also a host of capacitors and a...