I would like to talk about the iPhone touch disease which afflicts the iPhone 6 plus and lately I’ve been seeing a lot of iphone 6 devices with this problem as well.
I will briefly explain how and why this happens. The iPhone 6 plus and 6 have a very soft aluminum frame that gets bent very easily and over time the touch IC develops cold solder joints under it and in some instances a trace also fractures especially on the iPhone 6 plus, thus to future proof the repair a jumper wire will have to be used to repair the broken trace. The video below demonstrates the repair