Old Sammy LCD has dies?

Discussion in 'Audio Visual' started by Widman, Jun 13, 2013.

  1. Widman

    Widman Member

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    Samsung LA46m81BD seems to have given up.:thumbdn:

    It turns on but the screen is really dark and the colour is completely off. Refresh rate is screwed as whatever is on screen takes ages to fade away.

    No idea what happened, it was working one day and not the next.

    Anyone heard of such a thing?
    Can it be resuscitated?
     
  2. nanolimit

    nanolimit Member

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    Sounds like either your Y-SUS or buffer board is on the way out.

    If you don't mind playing with it, pop the back panel off it and post a picture
     
  3. Linkin

    Linkin Member

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    I concur that it would be the Y-SUS board. Replaced one of those jobbies on a sony plasma that had all kinds of issues... just don't go anywhere near the arcing 240v power plug on the back :Paranoid:
     
  4. Stooge007

    Stooge007 Member

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    would there be enough charge in the caps to do damage?
     
  5. Linkin

    Linkin Member

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    In a TV? I'd definitely stay away from the large caps.
     
  6. OP
    OP
    Widman

    Widman Member

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    So I take it that the fact it has been unplugged for several days still doesn't make it safe?

    Anything I should do to mitigate the risk? Can they be discharged?
     
  7. OP
    OP
    Widman

    Widman Member

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    Went for it anyway. Still alive :thumbup:
    If my googlefu is awesome I think 1 is the y-sus board and 2=x-sus. Am I right?

    Click to view full size!

    Maybe 1 = Y-buffer and 2 = X-buffer. Which is the Y-sus?
    The white blobs of goo on this board look very dodgy, and not at all effective, even if they are meant to be there. Could that and/or the dust be the problem


    Click to view full size!
     
    Last edited: Jun 14, 2013
  8. OP
    OP
    Widman

    Widman Member

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    Where'd everybody go?
     
  9. Fishface

    Fishface Member

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    Sustain boards are found in Plasma TVs, not LCDs.
    Board one is the input board, board 2 is the PSU.

    The white stuff is normal for holding components in place.

    The fault could be caused by faulty power supply caps, the likely ones are the small ones at the top right side of the board as well as other small ones around the board.

    Skill in soldering is needed to replace these or you will end up with a TV that can live on the naturestrip.:(
     
  10. nanolimit

    nanolimit Member

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    Flat out at work :tired:

    By the look of it the two white circles are your X and Y buffer board, cant make out enough over the second image.
    All that white gloop is fine.
    Open up the metal caging and have a close look at the power supply and look for bulging caps.

    Can you post a close up of the parts under the caging (should be 2 boards) and the model numbers/ or part number of the board.
     
  11. redslert

    redslert Member

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