A tested a functioning touch screen not responding to touch.

Hello,

My father was working on fixing up an iphone 5 he purchased form ebay before passing away. So I have taken it upon myself to finish the job.

So here is the information:

- Touch screen does not respond to any touch anywhere on the screen.

- I have made sure the connections are clicked in properly.

- The screen is fine, as I have tested it on another phone.

- There is a dent on the logic board metal casing, where I believe the touch IC should be.

- Possibly water damaged, but I do not know for sure.

Could there be any other reasons the touch is not working?

Is the touch IC a difficult repair? I am struggling to find videos for this.

Many thanks,

Craig