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Original post by: Brian S ,


Sounds like one of the  touch IC chip has failed, and yes it's related to the phone being dropped. There is a known problem with the touch IC chips having oxidized pads under the chip cousing the solder to fracture or a poor solder joint.

The only fix is replacing they touch  IC chip. You would need to send it out for repair if you don't have the necessary equipment or skill level to perform that repair.