Samsung 3D plasma PN51d550C1F fixed with non 3D X-Main Board

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  • Sevenqi
    Badcaps Veteran
    • Jul 2011
    • 292

    #1

    Samsung 3D plasma PN51d550C1F fixed with non 3D X-Main Board

    I got a Samsung plasma model PN51d550C1F , this is a 3D TV, couldn't power on, relay clicked a few times and stopped.
    Open cover and measured the VA and VS, both zero. But 15v and 5V were fine, the digital board led flashing, this is normal.

    Unplug the x-sustain board, plug the power cord, there was VS (207V) and VA(58V), but it dropped gradually to 0V. This may mean the power supply was good, the y-board was good too, problem was the z-main board.
    The part number of this x-main is LJ41-09422A, REV 1.3(11/06/20), took it out and checked many MOSFETs were shorted.

    I happened have another x-main board, the part number was the same, V1.3 (11/02/11), version was the same but manufactured date was different. this board was pulled from a cracked screen non 3D plasma PN51D450A2D.

    I compared the parts, not exact the same, obvious the 3D one had more caps and MOSFETs, see first photo (3D), second (non 3D).

    I replaced the bad 3D x-main with this non 3D one, it works perfect! Cheap solution !
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    Last edited by Sevenqi; 06-10-2014, 12:51 AM.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Samsung 3D plasma PN51d550C1F fixed with non 3D X-Main Board

    The problem with this is you've reduced the power handling capability of the X-main and the ER circuit is mismatched. The D450 X-main will likely fail soon, or it will kill the Y-main.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • ehboy
      Senior Member
      • Sep 2014
      • 66
      • Canada

      #3
      Re: Samsung 3D plasma PN51d550C1F fixed with non 3D X-Main Board

      Glad I found this. Having a devil of a time sourcing a 3D y main. Lots from the d450 2D models out there, but few for what I need.

      I notice mine are large lettered DFG as opposed to this 3D one which seems to be just DF.

      So tom, I would assume I should take this info under advisement and source the proper one?

      My revision number is 764D, which seems rare, but 764A would work perhaps?

      Thanks.

      Comment

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