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Samsung ln46a630 turns on perfectly then after 30-45 seconds the screen goes black. Audio is perfect. No menus or anything appear and occasionally it will pop back on for a few seconds. I have replaced two main boards in the back of the tv (the big brown one and one that connects to the side inputs)

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  • Master
  • 933 Answers

If the screen is going pitch black, you may have a back light inverter problem

Posted on Dec 08, 2012

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Posted on Jan 02, 2017

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javswr
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SOURCE: sanyo ce32ldy1b lcd 160gb black screen with sound

It sounds like you have a power supply problem, this powers the inverter! Where you just replaced the inverter, we could assume it is good! Look for some bad caps (capacitors) on the power supply board. They will look bulged on the top an may be a little leaky (brownish stain). The power supply can fail on some output and be good on others. Was the back light inverter new? If all else fails, see if you can return the back light inverter and get another! I hope this is helpful!!

Posted on Mar 02, 2009

  • 21 Answers

SOURCE: Samsung 4061F 40" LCD TV

To all who are having power supply issues: Samsung is now acknowledging a problem with faulty capacitors. I called 1 800 726-7864 and they said they would repair certain out-of-warranty TVs if the problem is related to the capacitors. I just called and they are sending a service rep out to diagnose the problem.

Posted on Feb 22, 2010

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