Question about Samsung PN50A450 50 in. Plasma HDTV

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My Samsung PN50B650 plasma tv after 30min-hour turns darker or dims.Picture still looks good but darker.I replaced logic board and power supply board.Also have faint red and green band or vertical bars across the screen.What do I need to fix this.

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  • Samsung Master
  • 933 Answers

I would suspect a problem with x main board or circuit. I would start with checking the connections on the x main board?

Posted on May 26, 2014

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Posted on Jan 02, 2017

  • 118 Answers

SOURCE: Black Vertical Lines in screen

All I can tell you is that you maybe have left your T.V. on a channel that didn't move for so long, or maybe someone else did and it burnt the screen. Plasma's run off of plasma gas to create the great picture and they collect on the screen and stick. What you need to do is go to your menu and look for "screen burn protection" and put it on white and let it sit for 20 minutes. All of one color such as white doesn't harm your T.V. The only way anything burns is like a bright white line in front of a black background.

Posted on Jan 30, 2009

  • 6 Answers

SOURCE: nec plasma tv 42MP4

these plasma vertical black lines are notorious. there's a video of a fix on this plasma tv repair site. good luck!

Posted on Jan 23, 2009

  • 1 Answer

SOURCE: Red Dots on My Plasma.

Did you get this problem resoslved? I had the same issue a few months ago. I tech came by and took my TV to the shop, a few days later he said it was fixed as they needed to make some adjustments.....The TV has been fine up until a week or so ago and now the red dots have appeared again. Was wondering what happened to yours.

Posted on Dec 28, 2006

  • 304 Answers

SOURCE: Samsung TV Power Supply Board

I doubt that moisture damaged the SMPS bd.
There are many circuit boards in your set and it will take a trained samsung tech to find the problem.

Posted on Jul 17, 2009

  • 304 Answers

SOURCE: samsung plasma HPR4272 that had a 4" black vertical line on

There are at least two issues here. First you have bad buffer boards. Second Very possibly a bad X-Main bd and P-Logic bds. Have a trained Samsung tech troubleshoot the set.

Posted on Jul 17, 2009

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Hi T Quinn.
Does the TV behaves the same way in all the inputs?
Does the color chances when the TV has been on for a while?
This failure could be in the main board, all the video info gets into the logic board from the main board itself.
I would suggest to check for proper voltages from the power supply to the main board, if all the voltages measure as expected. I would suggest to use a small cooling fan and place it near the main board.
Let me know if you require further assistance..

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1 Answer

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