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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Re: Tv turns off after several minutes


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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Re: Tv turns off after several minutes

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

Re: Tv turns off after several minutes

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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FOLLOW this steps and fix it. God bless you

  • 1
    Power down the TV. Let it cool down for several minutes to avoid touching anything hot. There are many parts inside the TV that could be hot.

  • 2
    Unplug the TV and all media devices attached to it. Let the TV sit again for several more minutes just to be safe. The lamp receptacle and other components could still be hot.

  • 3
    Unscrew the back cover of your TV with a screwdriver. Have someone help if the cover is big. The lamp's housing unit on most TVs is located towards the bottom. Refer to your TV Owner's Manual for specific instructions.

  • 4
    Unscrew the lamp's housing unit with your screwdriver. Take your time to avoid damaging the housing unit. You'll see the lamp once you open the housing unit.

  • 5
    Use a soft cloth to unscrew the lamp out of the housing unit. There's a possibility the lamps- could still be hot. The cloth will help protect your hand.

  • 6
    Screw the replacement lamp into the housing unit with the same soft cloth. The oils from your fingers could ruin a rear projection TV bulb.

  • 7
    Reattach the lamp's housing unit and TV back cover. Make sure no wires are loose or get caught when screwing the back cover on.

  • 8
    Attach all media devices like cable or satellite boxes. You should now be able to watch your TV with a brand new picture.

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I had a similar problem with my Phillips 42 in. LCD HD TV.

Here's the problem. The Power Supply Board. I opened my TV up(warranty was up of course) and found several bad capacitors. Phillips and several other companies were sold capacitors that although were highly rated failed within 5 years because of a lack of preservatives. All sorts of electronic equipment is now being effected due to these defective capacitors.
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2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
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