The issue of not having touch functionality or partial touch after dropping a phone was a common issue but it could be fixed by replacing the screen and lcd screen assembly. NOT ANY MORE!
iPhone X and newer models are designed as two separate layers of boards soldered on top of each other which we call the a “sandwich board”. When an iPhone is dropped or in some cases ran over by a car, the impact will cause a crack in the solder joints and in some case will break off pads with it.
Did you just replace the screen of your iPhone 8 or iPhone 8 Plus?
We have the solution!
The main and only cause of this issue is a what we call as technician pry damage.
this missing component in the picture is a mosfet and it is located right above where the battery connects on to the logicboard and it is very easy to knock it off the board or damage it when trying to disconnect the battery.