Chosen Solution

I havé an iPhone 6 I drop’ it and a vertical lines apeared on theleft side of screen and the touch is unresponsive only on that side it works on the right side after that I searched for the the probleme and I disassembled it and reconnect the 4 cables and result was w disaster the screen is more damaged as new white squares appeared a nd the screen freeze after a while I dont know what to but sometimes the goes back normaly Update (09/10/2016)

before I disassemble it

and thats after

That’s a LCD / Digitizer connection issue. I guess you have already tried reseating the connectors on the logic board for the screen. Edit: Since the screen hasn’t been replaced then it’s probably the screen.

Yes i reste the digitizer like 10000 times but it gets worse