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My Xperia S appears to be having sensitivity problem on the right side of the screen. Whenever I draw or swipe, it has a 'area' where my gestures couldn't be detected. Any solution to my phone? I appreciate that, thank you. Below is the service test result on touchscreen.
If you have any screen protector on, try removing that and see if it helps. If not i recommend that you contact your local Sony Xperia support (http://www.sonymobile.com/global-en/support/contact-us/) or a service location for assistance.