Vision and sound go off after 15 to 20 minutes. Why and what can be done?

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Hi Dick,

Are you experiencing this problem to your television set?

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ok. please try to reset the tv first by unpluging the cord from the wall outlet and then press and hold down the power button for 20 secs. plug the cord back in then turn on the tv and then observe. 

Let me know the result.

Dear Dick, It was a pleasure helping you with your appliance/samsung issue today. Here is a summary of the resolution.
Issue identified : tv turning off after 15-20 minutes
Solution Implemented : chat with cx and provided steps to reset the tv (steps below). cx tried the procedure but still encountering issues. told cx that the problem is the power supply board that needs to be replaced. Answer accepted. 
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