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I can't lock my screen. When I click the lock button, the screen just blacks out. When I click the home button it directly show me the home screen even though I have set the lock pattern.

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Your title mentions an update. What sort of update did you do? – Trebor Rude May 8 '13 at 12:21
When you mention pressing the home button, do you mean pressing it while the screen is off? – Trebor Rude May 8 '13 at 12:28
i m update from 2.3.6 to 4.1.2 firmware XSLSJ via odin. When i m press the lock screen button, the screen is blackout,mean is off.When i press the home key, the screen is on and direct show me the home screen even i do set the key lock pattern. – Evil-wing May 8 '13 at 13:44

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