Samsung HP-R5072 50 in. Plasma HDTV Logo

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anthony herbert Posted on Sep 25, 2006
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Samsung flat panel spn4235

My flat panel when switch on has this dotted line(blue) across the top of the screen, simalar design to the matrex movie screen.

  • Anonymous Mar 14, 2014

    Blue light across the top of screen

    Blue light across top screen

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  • Expert 217 Answers
  • Posted on Feb 17, 2007
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Sounds like the logic board

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Hi have a samsung 42 inch plasma, all of a sudden it has a band 20cm wide of dotted lines going across the whole screen, some channels or when playstation in use the band gets wider, does not seem to...

if the band is horizontal your tv has bad y-buffer board. Usually there are 2 buffer boards- top and bottom. if the problem is in the top half of the screen replace the top board, otherwise replace bottom board.
but better to replace both a the same time.

if the tv has a vertical lines from top to bottom it may have bad plasma panel and can be considered as not economical to repair.
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HOW LONG AND WIDE ARE THE LINES, IF 3-4 INCHES THICK, COULD BE A BUFFER BOARD, OR COULD BE THE PLASMA SCREEN ITSELF
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SOUNDS LIKE YOU HAVE A BAD Z-SUS BOARD...LOOKING FROM REAR OF SET WITH BACK COVER OFF..ITS ON RIGHT SIDE..CALL ANDREWS ELECTRONICS IN CALIFORNIA WITH MODEL #..THEY WILL GIVE YOU A PRICE AND PART #...JOE ACE
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The set is under a year old and is under warranty. The LVDS cable inside these sets have a history of coming loose. The problem could be the panel. Either way, the set is the problem and needs to be looked at. This set is worked on in the home and does not need to be taken to a shop, so, you can still use it. Contact Samsung at: 1-800-SAMSUNG Hope this helps.
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The set will need some screen voltages adjusted on the power supply board, the VS voltage is marked on the panel inside the set, find the VS test point and the VS adjustment potentiometer. adjust the voltage down at least 10 volts, if your not an experienced person in electronics, get a person that is, there is a high voltage on that board that is dangerous
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