There's a dead spot on the right of my android device(nexus4) , it interferes with pressing some keys. Is there a solution.
The solution that i've found is to use sthe swiftkey keyboard, but choose "compact" layout. it looks lik the right section in 
Than by pressing on the arrow shift it to the other side, and resize to maximum.
Works pretty well.
Is your screen broken in even the slightest bit? It is very common for an LG phone screen to become unresponsive when broken. Also, is the phone second hand? If so it might have had the screen replaced which could have installed a defective screen into your unit.
If either of these are true i would recommend replacing the screen. It is a relatively easy repair.