Samsung PS-42D4S plasma. Has sound, no picture. Please help!

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  • scokljat
    Badcaps Veteran
    • May 2012
    • 275
    • Croatia

    #21
    Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

    Originally posted by ReeceyBurger123
    Do you have a hair drier you can use it to help diagnose the issue ? ?
    Hair dryer? Never heard of such apparatus ;-) Just kidding. I have a hair dryer and I also have a reflow station. What part exactly do you want me to heat? ...and what do you think we're going to accomplish?

    Thanks,

    S

    Comment

    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain

      #22
      Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

      Ok heat the centre of the Psu where the transformers are. They polly cap (little rectangles) I think are near them any how heat the Psu and see if Vs come up. Sorry for the light handed replies as well in college and have to type fast haha.
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

      Comment

      • Maklaud
        Senior Member
        • Sep 2015
        • 56
        • Russia

        #23
        Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

        Originally posted by ReeceyBurger123
        Do you have a hair drier you can use it to help diagnose the issue ? ?
        Who's this for a question?

        Comment

        • Maklaud
          Senior Member
          • Sep 2015
          • 56
          • Russia

          #24
          Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

          Who was asked this question?

          Comment

          • ReeceyBurger123
            Never Give Up !
            • May 2014
            • 7325
            • Britain

            #25
            Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

            I asked it to Sc to help toruble shoot.
            Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

            https://www.facebook.com/Telford-Tel...7894576335359/

            Comment

            • scokljat
              Badcaps Veteran
              • May 2012
              • 275
              • Croatia

              #26
              Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

              Originally posted by Maklaud
              Yes measure. Because there can be 290-300V and not 390-400V.
              I did some measurements. I measured DC voltage directly on main rectifiers (BD1 & BD3 - two D15XB60 connected in parallel) and I also measured DC voltage on large filter caps (C5 & C6 330uF/450V connected in parallel). Positive sides of C5 & C6 are also connected directly to B+_PFC. See picture.

              Readings when TV is ON (TV is 220/240V model):

              Rectifiers: 215VDC
              Large filter caps (B+_PFC): 320VDC

              Any ideas? Is it too low?? Is that causing my problem - no Vs? What could be the reason?

              One strange thing is - I get those voltage readings even if TV is in standby (relay is OFF), but it may be because filter caps are charged and I didn't wait enough for them to discharge...

              Thanks,

              S
              Attached Files
              Last edited by scokljat; 09-16-2015, 12:44 PM.

              Comment

              • Maklaud
                Senior Member
                • Sep 2015
                • 56
                • Russia

                #27
                Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                IC1 13 pin (vcc) Voltag = ?
                Last edited by Maklaud; 09-16-2015, 01:39 PM.

                Comment

                • Maklaud
                  Senior Member
                  • Sep 2015
                  • 56
                  • Russia

                  #28
                  Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                  (B+_PFC): 320VDC It is low voltage. When TV is turned on = 400V

                  Comment

                  • scokljat
                    Badcaps Veteran
                    • May 2012
                    • 275
                    • Croatia

                    #29
                    Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                    Originally posted by Maklaud
                    IC1 13 pin (vcc) Voltag = ?
                    I measured IC1 pin 13 (VCC) to pin 10 (GND_H). I see GND_H is not same as RTN (chassis ground) so I suppose all measurements on primary side of PSU must be measured relative to GND_H.

                    IC1 pin 13 voltage = 17.5V

                    See pic.


                    Thanks,

                    S
                    Attached Files

                    Comment

                    • Maklaud
                      Senior Member
                      • Sep 2015
                      • 56
                      • Russia

                      #30
                      Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                      Yes, all measurements on primary side of PSU must be measured relative to GND_H.
                      Voltage is normal.

                      Comment

                      • Maklaud
                        Senior Member
                        • Sep 2015
                        • 56
                        • Russia

                        #31
                        Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                        Check IC1 ML4824 (12 pin) output signal.
                        VCC_S_R
                        Q3 - Q4
                        D9, D10
                        IC1 ML4824

                        IC1 ML4824 (6 pin) Vdc PC1S (TLP421) IC5(KA431)
                        IC1 ML4824 (5 pin) VS_ON - PC10S - Q21
                        Last edited by Maklaud; 09-16-2015, 04:07 PM.

                        Comment

                        • Maklaud
                          Senior Member
                          • Sep 2015
                          • 56
                          • Russia

                          #32
                          Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                          ml4824 datasheet
                          Attached Files

                          Comment

                          • scokljat
                            Badcaps Veteran
                            • May 2012
                            • 275
                            • Croatia

                            #33
                            Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                            Originally posted by Maklaud
                            Check IC1 ML4824 (12 pin) output signal.
                            VCC_S_R
                            Q3 - Q4
                            D9, D10
                            IC1 ML4824

                            IC1 ML4824 (6 pin) Vdc PC1S (TLP421) IC5(KA431)
                            IC1 ML4824 (5 pin) VS_ON - PC10S - Q21

                            Well, let's do it step by step.

                            First I'll check voltages on IC1 pins 12, 6 and 5. Right?

                            What do you want me to do with all other mentioned components related to IC1? (VCC_S_R, Q3, Q4, D9, D10, PC1S, IC5, PC10S, Q21) and signals VCC_S_R and VS_ON?

                            Btw, looks we are getting somewhere step by step, right? What is your primary suspect currently?

                            Thanks,

                            S

                            Comment

                            • scokljat
                              Badcaps Veteran
                              • May 2012
                              • 275
                              • Croatia

                              #34
                              Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                              Originally posted by Maklaud
                              Check IC1 ML4824 (12 pin) output signal.
                              VCC_S_R
                              Q3 - Q4
                              D9, D10
                              IC1 ML4824

                              IC1 ML4824 (6 pin) Vdc PC1S (TLP421) IC5(KA431)
                              IC1 ML4824 (5 pin) VS_ON - PC10S - Q21
                              Here are measurements (when tv is ON):

                              IC1 pin 12 = floating around 0.3V
                              IC1 pin 6 = 1.17V
                              IC1 pin 5 = 0.6V

                              All measured relative to GND_H.

                              Thanks!

                              S

                              Comment

                              • Maklaud
                                Senior Member
                                • Sep 2015
                                • 56
                                • Russia

                                #35
                                Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                                And when tv is OFF.
                                IC1 pin 13 =? V
                                IC1 pin 12 =? V
                                IC1 pin 6 = ? V
                                IC1 pin 5 = ? V

                                Comment

                                • scokljat
                                  Badcaps Veteran
                                  • May 2012
                                  • 275
                                  • Croatia

                                  #36
                                  Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                                  Originally posted by Maklaud
                                  And when tv is OFF.
                                  IC1 pin 13 =? V
                                  IC1 pin 12 =? V
                                  IC1 pin 6 = ? V
                                  IC1 pin 5 = ? V

                                  When TV is in Stand-by mode:

                                  IC1 pin 13 = 0.5V
                                  IC1 pin 12 = 0.08V
                                  IC1 pin 6 = 0.016V
                                  IC1 pin 5 = 0V

                                  Thanks!

                                  S

                                  Comment

                                  • ReeceyBurger123
                                    Never Give Up !
                                    • May 2014
                                    • 7325
                                    • Britain

                                    #37
                                    Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                                    https://m.youtube.com/watch?v=yE5CrBlsS48
                                    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                    https://www.facebook.com/Telford-Tel...7894576335359/

                                    Comment

                                    • ReeceyBurger123
                                      Never Give Up !
                                      • May 2014
                                      • 7325
                                      • Britain

                                      #38
                                      Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                                      There is the link watch the video different model yes however Psu is the same and similar issue. I dont think that the Ml4824 chips are at fault to be dead honest.
                                      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                      https://www.facebook.com/Telford-Tel...7894576335359/

                                      Comment

                                      • ReeceyBurger123
                                        Never Give Up !
                                        • May 2014
                                        • 7325
                                        • Britain

                                        #39
                                        Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                                        The parts that were hanging off the Psu Pcb are the polly caps try heating where they are if not try replacing them they can cause aload of issues.
                                        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                        https://www.facebook.com/Telford-Tel...7894576335359/

                                        Comment

                                        • Maklaud
                                          Senior Member
                                          • Sep 2015
                                          • 56
                                          • Russia

                                          #40
                                          Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!

                                          Scokljat, when TV is ON. VS =?
                                          Last edited by Maklaud; 09-17-2015, 11:06 AM.

                                          Comment

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