Toshiba Model: 50L711U18 - Back Light is turning off after 10-15 mins

Toshiba Model: 50L711U18 - Back Light is turning off after 10-15 mins

I have problem with my Toshiba Model: 50L711U18. The back light turns off after 10-15 minutes. I tried to restart it but the back light doesn't turn on. I used flash light to check the video, and video is still there. I unplugged my TV for about 15-30 minutes then plugged it again, the back light Turned ON, but after 10 - 15 minutes it Turned OFF again.

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