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Message: <blockquote data-quote="asanka99" data-source="post: 15571708" data-attributes="member: 187038">mulin msg type ba thamai tika dawsakin ohoma wenawa.meka karala balahan.1) type this service code:   *#*#7378423#*#*  on your Xperia U dialing pad2) on service screen choose : Service test3) under service test menu choose : Touch test4) After that a black screen comes under which " just draw a zig zag line(as screen shot below) with your finger from top to bottom of your screen without lifting it up in the middle".5) share your result in this thread by making its screen shot by holding power buttom and volume down key.Every member please participate to know exactly how many of us actually are facing this problem and give the support  team a rough estimate of the problem.my test screen shot:<img src="http://sonymobile.lithium.com/legacyfs/online/20673_Screenshot_2012-11-01-13-14-25.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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