Question about Samsung LE40R72BDX 40 in. HD-Ready LCD Television

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Samsung 40" LCD turns itself off and on

My samsung LNR408D lcd tv turns itself on and off multiple times when it is first powered up, and seems to stop when used for more than 30 mins. It has done this since 3 months after purchase, it went in for repair and the PSU was replaced. After a few months it did it again, and this time the PSU and PCB were replaced. Now 8 months later it is doing it again, and is out of warranty. Can anyone help please?!!! I have the same problem, i thought it might be dust so i gave the tv a blast with the wifes hairdryer and it made no differance, so i tried knocking it gently in various places when the problem occured and you guessed right it doesn't make a scrap of differance. the problem happens a lot when the tv is first turned on but after an hour it doesn't seem to happen or if it does it's only once an hour, the annoying thing is that i am about 6 months out of warranty & the tv cost over a thousand pounds

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  • davidsuther Jun 30, 2008

    My TV behaves in the same way( except I have not left it for>30 mnutes) I had ther retailer and his engineer out, but they seemed unsure of the problem and have taken the TV away.

  • Anonymous Mar 21, 2009

    I have the same problem! Every morning when I first turn the tv on, it makes repeated clicking noises like it's trying to come on but this continues for up to 10 minutes until finally it comes on. Sometimes when it finally comes on, the screen has nothing but multi colored lines and then I have to start the whole process over again. However, once it does come on with a normal picture, it usually works fine the rest of the day unitl I turn it on again the next morning.


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Try to tighten all screw around the power Supply to make a better ground ...

Posted on Jun 02, 2008

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Does you're TV have an "a/v board"? that is, an integrated controller for both the LCD and the speakers that is separate from the motherboard? I've never seen them integrated like that, but if so, you might try replacing it because it sounds like a cheap solution.
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