TV won't turn off

The device sources and the inputs have not been set to the correct mod.There could be a problem with the TV it's self for it to be turning off like a problem with the power supply for the TV.

Samsung HL-R5087W TV screen goes blank -tv/sound on - Forums ...

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CNETJun 11, 2015 - About a month ago, the at various times the tv screen would go blankeven though the tv ... Try turning off the cable/sat box when the happens. ... In reply to: Samsung SP50L7HX DLP TV linked to Sky HD box - same problem .... on it comesback to normal. however, once it went off again (Black Screen) after only 2-3 minutes. ln-t4069f picture problem lcd warmup - Forums - CNET
Jun 11, 2015
Samsung LCD TV LN-T5265F Black Screen Diagnosis Help ...
Jun 11, 2015
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I have samsung TV 40 inches flat screen comes on the picture ok but within 10 minutes the picture goes black and white

Replace the power supply board the blinking power indicator is usually indicating the power supply needs replacement or repair. You can get the replacement power supply boards from www.tvcircuitboards.com

Hi, Your TV needs software update.

To replace the screen is going to cost about at least $500.00.
I will try to sell the tv as is for parts. You can probably get about $100.00 . Thats how much I buy them for.

This normally causes by failure of power supply board. Some time it causes by failure of inverter board, in this case you can see the picture moving on the dark screen as it has no back light.

Hey,

My TV had the same problem. From my experience try when turning the TV on changing the TV channel on the TV not the remote.

when it blanks out, tuen the lights out in the room, and shine a flash light at the screen, see if you can see the picture, if you can, it is the inverter moard blamking out, thats the board that lights the back lights, if you cant, hit the input button on the remote, if the TV comes back with a picture, it is a problem with the main board, in paticular the componant input on the main board

Returned TV and got the 2008 model (even better deal) for the same price.