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If I were to activate the key lock the cell phone to actually go into standby mode but it turns itself back on immediately. Please help me! - Sorry for the Gramathics i´am German.
Perhaps you have an app installed in the phone causing the display to turn on. Start your phone in safe mode to see if the problem occurs in safe mode when no 3rd application is enabled:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008