Question about Samsung LN46D630 LCD TV

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Tv turns off automatically; the more I turn it on, the more quickly it turns off

I have a samsung LN46D630. When I turn it on, it will stay one for a few minutes, then shut itself off (the red light turns off, and the screen is black; I've looked at it in a darkened room and there is no light coming from the screen). I can turn it back on but, when I do, it stays on for a much shorter period of time, say 1 minute, before turning itself off again. If I turn it on again, it will stay on for just a few seconds, then turn itself off. I've noticed that if I leave it off for a while (for example, overnight), then when I turn it on the next day, it will again stay on for 5-10 minutes before turning off. Then the whole cycle starts again (=turn it back on, stays on a minute or so; turn it back on, stays on a few seconds). I have no knowledge of the inner workings of a TV but this seems like a heating issue to me (bad heat sinks maybe?). If anyone could help me figure out what's wrong, that would be fantastic, since the TV is now out of warranty and it'll cost me $75 just to get it looked at.

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  • KH70 Aug 17, 2013

    NB: My description was misleading and I need to clarify, so, here is the post, reworded for accuracy: I have a samsung LN46D630. When I turn it on, the screen will stay on for a few minutes, then shut itself off (the screen is black; I've looked at it in a darkened room and there is no light coming from the screen). I can turn the set off, then turn it back on and the screen will turn on, but it stays on for a much shorter period of time, say 1 minute, before turning itself off again. If I turn the set off and on again, the screen will stay on for just a few seconds, then turn itself off. I've noticed that if I leave it off for a while (for example, overnight), then when I turn it on the next day, the screen will again stay on for 5-10 minutes before turning off. Then the whole cycle starts again (=turn it back on, screen stays on a minute or so; turn it back on, screen stays on a few seconds). The set itself doesn't turn off, since the audio still works; it's just the screen. I have no knowledge of the inner workings of a TV, and the only thing I can say is that I don't think it's the backlight inverter, since I already replaced that. If anyone could help me figure out what's wrong, that would be fantastic, since the TV is out of warranty and it'll cost me $75 just to get it looked at. If any other info would be helpful please let me know, and if I can figure it out, I'll provide it. Thanks.

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  • Samsung Master
  • 54,195 Answers

Probably a failing power supply

Posted on Mar 09, 2015

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6 Suggested Answers

6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

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lukster

Luther Stephens

  • 217 Answers

SOURCE: Turns off by itself 10 minutes after use, and goes on and off

sounds like a main board problem

Posted on Apr 30, 2007

mahesh patel

  • 197 Answers

SOURCE: SAMSUNG PROBLEMS - Red and Green Shading All Over Screen

adjust vscan  vs & va voltages on power supply, if not that drive pcb's are bad

Posted on Jun 07, 2009

Anonymous

  • 1 Answer

SOURCE: Bottom half of the screen is black on Samsung HP-R5072 50 in. HDTV Plasma Television

I have a solution. My Samsung plasma had the same problem with the bottom half of the screen being black. Follow these directions and it will not cost you a dime, just some time. I took the back panel of the tv. I found the lower buffer board on the left hand side. I disconnect all the ribbon cables. Use an air cleaner to spray out any dust on the ribbon connection and the board. I connect the ribbons back to the board. My plasma is now as good as new. If you have issue with the top portion, do the same with the upper buffer board. I was going to buy a new tv but I'm glad I gave this a shot first. It's been almost a month and it's still working fine. Hope this helps and hope it saves you some money.

Posted on Nov 14, 2009

Anonymous

  • 4 Answers

SOURCE: samsung lcd tv ltm1755b won't turn on (power light stays red)

Problem: Samsung LTM1755B with only a blinking yellow LED when you try to turn it on.

Solution: I just had one of these come in. I opened it up, and found the U501 capacitor a little suspicious looking, in that it had a deformed top. It was a 470uF 16V electrolytic 105degC 10mm x 12mm. I replaced it with a very good quality 1000uF 16V electrolytic 105degC 10mm x 16mm Nichicon UHN1C102MPD. After that repair, when I tried to turn it on, the LED was yellow for a second, then green, then I got a picture, and it appeared to work great. I then asked the owner a week later how it was working, and they said it was working just like new!

Posted on Jan 19, 2010

Anonymous

  • 1 Answer

SOURCE: Samsung LN32A330 turns itself off after 5-10 minutes of being on.

its usually the 2200 microfarad cap on the power board that stops working. its really easy to replace and its only a 5 dollar repair part. use a 2200 mF cap rated around 25 volts instead of the usual 10 volts. samsung is famous for bad caps. if the cap feels buldged than this is the problem

Posted on Mar 30, 2010

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