Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

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  • Ken Laszlo
    Member
    • Sep 2015
    • 28
    • UK
    #1

    Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

    Hi everyone

    I'm trying to repair my Samsung 50 inch plasma set, that has a pattern of one (or sometimes two) flickering vertical lines across the entire screen.
    Note that this is intermittent - Sometimes the fault disappears completely and the set operates normally - Of late, though, the fault appears more often than not. Yesterday the patterns of lines was always there and has become enough of an annoyance to demand a fix or replacement.

    What I've done so far.
    Cleaned all the connectors with alcohol and reseated them all. It didn't help.
    Pressed/wiggled many connectors and boards to see if the fault goes or changes in some way to try to track down the fault. It didn't help. I couldn't identify anything.
    I especially checked the cabling and connectors between the main board (bottom right) and the control board in the centre. Nothing changed though.

    Could any help me further with this, please?

    Thank you
    Ken

    I attach a few useful photos of the fault, the inside of the unit and the unit's specs.
    Attached Files
    Tags: None
    • Andrew F. Ali
      Badcaps Legend
      • Jan 2014
      • 2450
      • Trinidad & Tobago
      #2
      Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

      That appears to be a Main Bd issue. Look for cold solder joints and reflow them.

        Comment

        • Ken Laszlo
          Member
          • Sep 2015
          • 28
          • UK
          #3
          Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

          Hi Andrew
          Thank you for your reply and advice.
          I'll remove the main board and check it over - I'll report back.
          Ken

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9535
              • Canada
              #4
              Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

              Have you tried going into the service menu, pdp option sub menu, and access the Pattern select submenu, if the patterns or ok it is likely the fault is on the main.
              I'm not 100% sure but you may be able to run the autogen on this logic board with the main disconnected.

                Comment

                • Ken Laszlo
                  Member
                  • Sep 2015
                  • 28
                  • UK
                  #5
                  Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                  Originally posted by R_J
                  I'm not 100% sure but you may be able to run the autogen on this logic board with the main disconnected.
                  Thank you for your advice, R_J - Yes.

                  I searched around on the net and found this video detailing just that!
                  https://www.youtube.com/watch?v=JjrwTZC5nVg

                  Running the patterns (with the main board disconnected) still showed the exact same line problem.
                  Would this lead me (us) to suspect the small logic board is faulty perhaps?
                  I've cleaned and reseated all the cables and don't suspect any are bad from visual inspection.
                  No amount of wiggling or flexing of the logic board or cables (in an attempt to check for loose connections or dry joints) changes anything - The fault is always there.

                  Thank you
                  Ken

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada
                      #6
                      Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                      About the only way you would see where the problem is coming from is with a scope, without a scope you would need to sub out the boards, it is likely control board or Ysus.

                        Comment

                        • Ken Laszlo
                          Member
                          • Sep 2015
                          • 28
                          • UK
                          #7
                          Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                          Forgive my ignorance here, but since the unit has vertical lines (i.e. lines being generated along the X axis), why would you consider that the Ysus board is the problem?

                          Thanks
                          Ken

                            Comment

                            • R_J
                              Badcaps Legend
                              • Jun 2012
                              • 9535
                              • Canada
                              #8
                              Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                              The noise that is being generated is high frequency and is effecting the scan signal so each line of video signal also carries the noise spikes. and is displayed on each line from top to bottom. or
                              It could also be caused by the control board and effect the x drive, again without a scope how do you know.

                              Have you removed the y & z boards and cleand the ground connections? Inspect them and see if there is any black corrosion at the ground connections. also check for any poor solder connections.
                              Last edited by R_J; 07-22-2018, 03:03 PM.

                                Comment

                                • Ken Laszlo
                                  Member
                                  • Sep 2015
                                  • 28
                                  • UK
                                  #9
                                  Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                                  Thanks for your reply.

                                  I've checked both X and Y boards - All good - No dry joints as I can tell. In fact, the set is in very good shape, despite being 9 years old.

                                  I will get the control board changed - It's very cheap.
                                  If that doesn't effect a fix, I can look into other things.

                                  Ken
                                  Last edited by Ken Laszlo; 07-22-2018, 03:11 PM.

                                    Comment

                                    • Ken Laszlo
                                      Member
                                      • Sep 2015
                                      • 28
                                      • UK
                                      #10
                                      Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                                      I reflowed the entire Y-Sus board, even though there were no obvious signs of dry joints.

                                      In operation, the set does have a slight 'buzz' sound that seems to be coming from a KF13N60 MOSFET on this board. Is this normal?
                                      The MOSFET does appear to have seen some 'action' (slight brown discolouration).

                                      Thank you
                                      Ken

                                        Comment

                                        • Taterbug
                                          Senior Member
                                          • Dec 2013
                                          • 114
                                          • United States
                                          #11
                                          Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                                          I just picked up a set with the exact same problem. Did you ever find what the culprit was?

                                            Comment

                                            • satyajit sarkar
                                              New Member
                                              • Sep 2020
                                              • 4
                                              • india
                                              #12
                                              Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                                              replace tcon pcb

                                                Comment

                                                • RJARRRPCGP
                                                  Badcaps Legend
                                                  • Jul 2004
                                                  • 6304
                                                  • USA
                                                  #13
                                                  Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                                                  Originally posted by satyajit sarkar
                                                  replace tcon pcb
                                                  It's not an LCD.
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                                                    • Taterbug
                                                      Senior Member
                                                      • Dec 2013
                                                      • 114
                                                      • United States
                                                      #14
                                                      Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                                                      Replaced the t-con board and that fixed the problem. Thanks

                                                        Comment

                                                        • ZAINABALDHAIF
                                                          New Member
                                                          • Oct 2021
                                                          • 3
                                                          • Bahrain
                                                          #15
                                                          Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

                                                          Hello..I have a problem with the Smart TV..The type of Supra TV..Do you have any software for Supra TV..55 inches



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                                                            • ZAINABALDHAIF
                                                              New Member
                                                              • Oct 2021
                                                              • 3
                                                              • Bahrain
                                                              #16
                                                              Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please



                                                              Originally posted by zainabaldhaif
                                                              hello..i have a problem with the smart tv..the type of supra tv..do you have any software for supra tv..55 inches



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