Samsung plasma wont power on pn50a550

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  • shelby5041
    Badcaps Legend
    • Feb 2009
    • 1505
    • united states of america usa

    #1

    Samsung plasma wont power on pn50a550

    Hi

    Picked up this tv today....when plugged in u can hear a click but standby light just blinks red

    Wont power on

    I do get 5v standby power

    Is there a common issue with this brand/ model for no power on?

    Also on logic board there are 2 green leds that just blibk rapidly continuously when tv plugged in.

    No blown fuses on y or z or ps
  • shelby5041
    Badcaps Legend
    • Feb 2009
    • 1505
    • united states of america usa

    #2
    Re: Samsung plasma wont power on pn50a550

    I was thinking of removing cables from boards to see if i can get to power on and isoltae issue .....but some of these models wont power on with certain boards disconnected but it cant hurt to try

    Comment

    • shelby5041
      Badcaps Legend
      • Feb 2009
      • 1505
      • united states of america usa

      #3
      Re: Samsung plasma wont power on pn50a550

      I checked and all voltages coming from ps appear to be good so ps prob not issue

      Vs good
      Va good
      Vg good
      Standby good

      Comment

      • shelby5041
        Badcaps Legend
        • Feb 2009
        • 1505
        • united states of america usa

        #4
        Re: Samsung plasma wont power on pn50a550

        If i unplug y board from ps tv still wont power on

        If i unplug z board from ps tv will still not power on

        Comment

        • aaronwt6
          Badcaps Veteran
          • Apr 2013
          • 855
          • US

          #5
          Re: Samsung plasma wont power on pn50a550

          Main board issue. Try replacing C102 on the back. There are tons of threads about this if you just search for 'C102' on here. If the TV isn't playing the startup tone over and over, there's a good chance that the board has been damaged beyond just replacing C102 but that's a good place to start. 9x out of 10 it will remedy the issue.

          Comment

          • shelby5041
            Badcaps Legend
            • Feb 2009
            • 1505
            • united states of america usa

            #6
            Re: Samsung plasma wont power on pn50a550

            Hi thanks

            Tv does not power on at all....no pic...no sound...no jingle

            The front samsung logo is lit up and all output voltages from ps are good but keeps clicking and wont power up

            Comment

            • shelby5041
              Badcaps Legend
              • Feb 2009
              • 1505
              • united states of america usa

              #7
              Re: Samsung plasma wont power on pn50a550

              I will reseacrch the c102 issue....like u said its a start...and mine keeps cycling / making clicking sound every minute or sonbut never does turn on.....not sure if c102 is same repair as mine..

              Thank you

              Comment

              • shelby5041
                Badcaps Legend
                • Feb 2009
                • 1505
                • united states of america usa

                #8
                Re: Samsung plasma wont power on pn50a550

                Brief research on this model had many main board issues...either reflowing or replacing c102 fix most cycling issues

                There are no main boards for sale on ebay and many people selling main board repair kits for this model....so im going to concentrate on main board

                Doubt its a y or z issue

                Comment

                • attainteddragon
                  Badcaps Veteran
                  • Apr 2013
                  • 764
                  • australia

                  #9
                  Re: Samsung plasma wont power on pn50a550

                  you can confirm if it the main board by running the test patterns.

                  disconnect the lvds cable and jump pin 3+4 on the control board. if all other boards are good, you will have good clean test patterns showing on the screen.
                  WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                  Comment

                  • shelby5041
                    Badcaps Legend
                    • Feb 2009
                    • 1505
                    • united states of america usa

                    #10
                    Re: Samsung plasma wont power on pn50a550

                    Ok i will try tomorrow

                    I tried reflowing main in oven at 385 for 10 min....didnt fix issue

                    Comment

                    • shelby5041
                      Badcaps Legend
                      • Feb 2009
                      • 1505
                      • united states of america usa

                      #11
                      Re: Samsung plasma wont power on pn50a550

                      Do i disconnect power cable to main or just the lvds?

                      And where are pins 3-4 on logic?

                      Comment

                      • shelby5041
                        Badcaps Legend
                        • Feb 2009
                        • 1505
                        • united states of america usa

                        #12
                        Re: Samsung plasma wont power on pn50a550

                        Can you clarify please

                        Comment

                        • attainteddragon
                          Badcaps Veteran
                          • Apr 2013
                          • 764
                          • australia

                          #13
                          Re: Samsung plasma wont power on pn50a550

                          post a pic of your control board and we will point it out.
                          WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                          Comment

                          • shelby5041
                            Badcaps Legend
                            • Feb 2009
                            • 1505
                            • united states of america usa

                            #14
                            Re: Samsung plasma wont power on pn50a550

                            ok i will when i can....quick question....on the main board is a surface mount cap c102

                            its 47uf 10v "tatulum" polymer

                            can i just rrplace it with a typical thriugh hole alum cap and soldrr legs to pad?

                            Comment

                            • shelby5041
                              Badcaps Legend
                              • Feb 2009
                              • 1505
                              • united states of america usa

                              #15
                              Re: Samsung plasma wont power on pn50a550

                              and r u saying disconnrct lvds cable on logic and jump pins 1/3 whrre the rrmoved connector was?

                              Comment

                              • attainteddragon
                                Badcaps Veteran
                                • Apr 2013
                                • 764
                                • australia

                                #16
                                Re: Samsung plasma wont power on pn50a550

                                i believe that you can change out that tantalum with a low esr alu cap, but i will let someone else confirm that.

                                there are 4 prongs or holes for jumping on the control board. you will need to jump pin 3 and 4.

                                not jump the lvds connector pins.
                                WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                                Comment

                                • shelby5041
                                  Badcaps Legend
                                  • Feb 2009
                                  • 1505
                                  • united states of america usa

                                  #17
                                  Re: Samsung plasma wont power on pn50a550

                                  ok now i understand

                                  ill try to post pic

                                  Comment

                                  • shelby5041
                                    Badcaps Legend
                                    • Feb 2009
                                    • 1505
                                    • united states of america usa

                                    #18
                                    Re: Samsung plasma wont power on pn50a550

                                    pic of logic board
                                    Attached Files

                                    Comment

                                    • aaronwt6
                                      Badcaps Veteran
                                      • Apr 2013
                                      • 855
                                      • US

                                      #19
                                      Re: Samsung plasma wont power on pn50a550

                                      You can at least test the board using an aluminum capacitor. I'd recommend an equivalent surface mount for a permanent replacement but I do believe people have had decent luck either way with the repair.

                                      Comment

                                      • shelby5041
                                        Badcaps Legend
                                        • Feb 2009
                                        • 1505
                                        • united states of america usa

                                        #20
                                        Re: Samsung plasma wont power on pn50a550

                                        i agree....will test...with alum since i have some

                                        Comment

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