need part for ymain for samsung pn42a450p1dzxa

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  • TechOp
    Member
    • Oct 2013
    • 21
    • USA
    #1

    need part for ymain for samsung pn42a450p1dzxa

    Hey gang,
    After a week burnin had this TV come back with no picture but sound. I headed straight to the Y main board and voltage on the buffer was only 29v. Started checking the board visually and found what looks like a blown zener Diode. Wondering if any one has a schematic or knows the part number on that diode for a cross refer?
    ymain p/n: Lj41-05075a
    ZD5003
    Attached Files
    Last edited by TechOp; 03-24-2015, 06:11 PM. Reason: added photo
    sigpic
    Anything can be fixed with enough TIME and enough MONEY
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: need part for ymain for samsung pn42a450p1dzxa

      Looks ok to me. Zeners usually fail short or open. If that part has died in that location, it is likely Q5004 nearby has failed causing fault.
      I'd look at bad Y-buffer causing this, does Vsc/Vsch come back if Y-buffer out?
      Also check if control board is shutting down due to fault detect (will cause Vsc/Vsch to drop out) - can be due to X or Y-main fault...
      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

        • TechOp
          Member
          • Oct 2013
          • 21
          • USA
          #3
          Re: need part for ymain for samsung pn42a450p1dzxa

          Looks ok??? interesting....... I will check after my parts run to storage.
          sigpic
          Anything can be fixed with enough TIME and enough MONEY

            Comment

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