Chosen Solution
Did anyone fix the old iPhone 3GS. I know its old but mine was still functional until I tried to change the battery… and this pad split and part fell off. It is a metallic fabric-like silver pad beside connector 4. It is clearly visible as a rounded cornered rectangle about 1cm by 0.5cm, adjacent to connector numbered 4 in the ifixit teardown (pls see link below). It left a layer in place but shed a layer, looks metallic, what fell off conducts electricity, so I presume it is important to re-attach it for heat and/or electricity? Please, does anyone know what it is for? And how to re-attach it? Or what harm if operate without it? Silver pad adjacent to connector 4 in iPhone3GS teardown
Just put it there. It’s some kind of cushion to press the FPC cables down, if there is no exposed copper underneath it, conductivity is not important.
Are you referring to this?