Question about Samsung TXR3079 TV

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Tv turns off after several minutes

TV is not attached to anything.  After running for 10 minutes or so.  The T.V. turns off.  I unplug it for 5 minutes or so, it comes back on.  I have checked the sleep timer (not set).  I have gone into service mode and reset .  I believe there is an over current condition going on.  Any suggestions how to isolate the component or board would be appreciated.

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  • Anonymous Dec 02, 2007

    Same problem - been waiting for an easy fix to pop up, but so far haven't seen one.

  • Anonymous Dec 04, 2007

    Mine goes off after 2 hours. Wait 5 minutes and then over time turns off about every 15-20 minutes.

  • jgiardina Dec 29, 2007

    Mine will work for a while and then start shutting off and on. Once it
    starts shutting off and on ti will get more frquent until it's about
    every minute or two. - DO NOT get Best Buy Extended warranty.
    I've been waiting for 2almost 2 months for them to repair it.

  • cadblur Dec 29, 2007

    this has only happened twice in the last year. I waited for about five minutes, and it came back on by itself

  • jeepchick79 Feb 21, 2008

    mine too. i turn it on and watch for 30-40 mins. wait 5 mins and it turns back on for another 20 mins and then shuts off again. wtf is going on? im pretty upset about it since i didnt register it and now samsung wont help me. what customer service. i wont be purchasing samsung products any longer.

  • aswild Aug 18, 2008

    i have the slim fit and i turn it on and @ 15 min. or so it turns off ,,and will not come back on ..i unplug it and then it will turn on for another few then turns
    off.. i can unplug it and plug it back in an the red light on the front stays on ,,but when i turn tv on and it shuts off the light goes out and does not come back n ,tv is less than 2 years old ,,,i need help



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I had the same problem with my Samsung TV Model: TXR3079WHX. I troubleshot my problem with a can of component cooler from Radio Shack and found my problem to be a defective voltage regulator, identified as "QR015" on the main circuit board (the same board that contains the high voltage section).


Before I proceed any further I need to strongly warn you. Do not attempt to remove the back cover, troubleshoot, repair or perform the actions that I have done, if you are not a "qualified service technician". Removing the back cover exposes you (and anyone else) to harmful and deadly electric shock, even though the TV may be unplugged from the wall outlet and turned off. You (or anyone else) can be seriously injured or even killed. If you are not qualified, play it safe by allowing others who are qualified repair this for you.

The defective part (overheats and shuts your TV off) is voltage regulator manufactured by Fairchild. The part number is KA75450ZTA. This part is available from Mouser Electronics for less than 20 cents plus shipping. In order to replace this part a qualified technician will need to remove certain cables and unscrew the main board to allow access to desolder and solder the new component.

Hope this helps.

Posted on Jun 06, 2009

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It seems to be a heat issue. I have had this problem for over a year now. If I turn on a fan and have it blow into the body of the set behind the screen [either side] it solves the problem.

Posted on Dec 24, 2008


I am having the same problem, please let me know if you find a solution. Here is my email address:

Posted on Aug 30, 2008

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