Samsung ps50a457

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  • sordids999
    Badcaps Legend
    • May 2013
    • 2149
    • uk

    #1

    Samsung ps50a457

    Ok so ive got this tv which was totally dead so i checked on the net for any symptons so found this site and basically removed all the parts they listed and tested,but i could not find nothing wrong so i put the power unit back on noticed a standby light was on and the tv works now.
    so could it have been a cold joints etc ?

    thanks
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Samsung ps50a457

    Check all connectors seated and burn the unit in for a few days maybe on control board test patterns (auto gen using the jumper on pins 3-4.)
    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

    • sordids999
      Badcaps Legend
      • May 2013
      • 2149
      • uk

      #3
      Re: Samsung ps50a457

      typical ran all last night and this afternoon but just went into standby

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Samsung ps50a457

        Well if they were all that easy.....
        Start by taking pictures of the boards. Sounds a lot like a main board 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

        • sordids999
          Badcaps Legend
          • May 2013
          • 2149
          • uk

          #5
          Re: Samsung ps50a457

          so when i first had the tv it had no power it was totally dead
          Attached Files

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Samsung ps50a457

            So, what's the fault -now-? Do you have any 5V standby from PSU?
            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

            • sordids999
              Badcaps Legend
              • May 2013
              • 2149
              • uk

              #7
              Re: Samsung ps50a457

              hi tom all i basically done was tested the following parts listed below due to the tv was totally dead (but did not test the mosfet )
              F801S
              BP802S
              DP081
              CP085
              CP086
              FM801S
              FB801S
              DQ801
              DQ802
              DB801
              DB802
              DB803

              http://www.ohmsupplies.co.uk/Repair-...50A456-P50A457

              tv came back to life after doing this ran for a few hours last night but today went into standby ill be home later to test the 5v standby

              Comment

              • sordids999
                Badcaps Legend
                • May 2013
                • 2149
                • uk

                #8
                Re: Samsung ps50a457

                5v standby is 5.07 volts

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Samsung ps50a457

                  Any standby indicator? Unplug set and plug it in again - any flashes from light?
                  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

                  • sordids999
                    Badcaps Legend
                    • May 2013
                    • 2149
                    • uk

                    #10
                    Re: Samsung ps50a457

                    No tom

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia

                      #11
                      Re: Samsung ps50a457

                      Sounds like it could be dry joints. In the picture I thought Q801 looked a bit sus but it is blurred. PSU looks similar to the 50Q91,96 which I had one with similar issue. Cracked joints on the FETs.

                      I'm assuming you have 5v standby the whole time.

                      Comment

                      • sordids999
                        Badcaps Legend
                        • May 2013
                        • 2149
                        • uk

                        #12
                        Re: Samsung ps50a457

                        Yes 5v standby constant I have since resoldered the MOSFET joints all working again at the moment

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia

                          #13
                          Re: Samsung ps50a457

                          Originally posted by sordids999
                          Yes 5v standby constant I have since resoldered the MOSFET joints all working again at the moment
                          When I discovered this issue I found when I flexed the board mid point I could get the TV to fault and just shutdown. hopefully this is all it was, no doubt we'll find out in time.

                          Comment

                          • sordids999
                            Badcaps Legend
                            • May 2013
                            • 2149
                            • uk

                            #14
                            Re: Samsung ps50a457

                            Still working today so keeping my fingers crossed

                            Comment

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6458
                              • Australia

                              #15
                              Re: Samsung ps50a457

                              Did you see any obvious bad joints? intermittent faults are always fun, hope the luck continues.

                              Comment

                              • sordids999
                                Badcaps Legend
                                • May 2013
                                • 2149
                                • uk

                                #16
                                Re: Samsung ps50a457

                                Not really resoldered Q801 and Q802 still waiting for it to go into standby though

                                Comment

                                • tw2005
                                  Badcaps Legend
                                  • Oct 2011
                                  • 6458
                                  • Australia

                                  #17
                                  Re: Samsung ps50a457

                                  Can be hard to tell, but everytime you touched the board it came back mysteriously. I would have gone feral and touched up all the heatsinked parts to totally take that out of the equation but where those are that is the equivalent heatsink and FETs that gave me grief.

                                  Nil cost and a bit of time, better than replacing boards straight away. I guess once it starts running longer than it has previously then our confidence will grow.

                                  That one I had could run for hours, be good for a few days then just randomly drop dead but was perfect when it was going. Took me a week to get it to fault, that's when I thought I'd try and induce it with tapping the heatsinks.

                                  Once I flexed the board that permanently made it worse, it was fun. Was a fix for a mate.

                                  he just put up with it . i have seen one go up in smoke though with those bad joints.

                                  Comment

                                  • flocko
                                    Badcaps Legend
                                    • Nov 2012
                                    • 1121
                                    • uk

                                    #18
                                    Re: Samsung ps50a457

                                    when it fails do you have the relays clicking when you power on? i have had two with relays with dry joints on the back of the board

                                    Comment

                                    • sordids999
                                      Badcaps Legend
                                      • May 2013
                                      • 2149
                                      • uk

                                      #19
                                      Re: Samsung ps50a457

                                      I have a loud relay clicking when I turn it on anyway then it chimes and turns on

                                      Comment

                                      • Maroboy
                                        New Member
                                        • Feb 2014
                                        • 1
                                        • united states america

                                        #20
                                        Re: Samsung ps50a457

                                        Im new to the site hi

                                        Comment

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