Sony Xperia L1 Screen Always Open, I Cannot Lock

Question

I have a Xperia L1. When I press lock button, the screen locked and re-opened in 2 seconds every time. I cannot find the fix for it. Are anyone encountered with this issue ? Thanks.

— berkb | Sources

Answer

The problem has been solved. Proximity sensor seems broken due to service report. After a fix, it resolved. Thanks.

— berkb | Sources

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