Samsung PN50C490B3DXZA power issue

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  • AlbertaJason
    New Member
    • Dec 2013
    • 9
    • Canada
    #1

    Samsung PN50C490B3DXZA power issue

    Plasma tv was on loud pop wife says it shut down. When I came in the tv was lifeless. Unplugged it and waited a while. Plugged back in red standby was on. Tried turning the set on got a cycle of 5 tries where the relays click and then nothing.

    I have unplugged the x main board same relay clicks.

    If I unplug the logic board it will signal the tv is on plays the tune.

    Sounds to me like a short, where should I start?
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Samsung PN50C490B3DXZA power issue

      Have you tried isolating 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

        • AlbertaJason
          New Member
          • Dec 2013
          • 9
          • Canada
          #3
          Re: Samsung PN50C490B3DXZA power issue

          yes, but that in effect unplugs all other boards except the main... if I am understanding you right
          I am working on pics now

            Comment

            • AlbertaJason
              New Member
              • Dec 2013
              • 9
              • Canada
              #4
              Re: Samsung PN50C490B3DXZA power issue

              all
              Attached Files

                Comment

                • AlbertaJason
                  New Member
                  • Dec 2013
                  • 9
                  • Canada
                  #5
                  Re: Samsung PN50C490B3DXZA power issue

                  and yes if I unplug the Y main I get the start up tune
                  Attached Files

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Samsung PN50C490B3DXZA power issue

                      OK, if you isolate the X-main from the Y-main what does it do? Startup tune?
                      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

                        • AlbertaJason
                          New Member
                          • Dec 2013
                          • 9
                          • Canada
                          #7
                          Re: Samsung PN50C490B3DXZA power issue

                          So if I unplug the X-main but leave the Y-main plugged in clicks...if I unplug the Y-main (vs,va etc plug) I get the start up. My voltages on start up are correct 206v on the vs.

                          I am back to my original diagnosis of the Y-main shorted... am I missing something or am I on the right track?
                          Last edited by AlbertaJason; 12-23-2013, 03:34 PM. Reason: more info

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Samsung PN50C490B3DXZA power issue

                              It is possible X-main is also bad. While rare, it is suggested on these panels which chain the energy recovery circuit (combined ERC) it's suggested to replace both boards simultaneously.
                              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

                                • AlbertaJason
                                  New Member
                                  • Dec 2013
                                  • 9
                                  • Canada
                                  #9
                                  Re: Samsung PN50C490B3DXZA power issue

                                  so back to the problem of more than its worth.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK
                                      #10
                                      Re: Samsung PN50C490B3DXZA power issue

                                      Really? The boards can likely be acquired for under $75. What 50" HD 720p 3D plasma can you get for $75?
                                      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

                                        • AlbertaJason
                                          New Member
                                          • Dec 2013
                                          • 9
                                          • Canada
                                          #11
                                          Re: Samsung PN50C490B3DXZA power issue

                                          best price i have found is $198 plus shipping which can be 50-200 bucks plus 5% exchange on us funds and 5% gov't tax if I need both boards its $500 i can buy a new one for that
                                          Last edited by AlbertaJason; 12-23-2013, 06:31 PM.

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