50" Samsung Plasma (model number PS50Q91HD) - possible purchase

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #81
    Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

    Originally posted by psmedley
    Found a 100W spotlight Unfortunately, when I turn the TV on I get relay clicking and the light flashes on/off inline with the relay.

    The fuse for the mosfets is still good.

    Ideas?
    Not sure about that; try potentially with more lamps. Other than that I'm not sure...
    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

    • scokljat
      Badcaps Veteran
      • May 2012
      • 275
      • Croatia

      #82
      Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

      So, you installed all new FET's, diodes and smd resistors?

      Comment

      • psmedley
        Senior Member
        • Apr 2012
        • 144
        • Australia

        #83
        Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

        Originally posted by scokljat
        So, you installed all new FET's, diodes and smd resistors?
        Replaced only the FET's that were shorted, and the 1SS184 diodes and resistors related to those two FETs.

        Comment

        • psmedley
          Senior Member
          • Apr 2012
          • 144
          • Australia

          #84
          Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

          Well I tried a 72W halogen globe as well and same result.

          Decided to bite the bullet and try it without the globe in series.

          Plugged in the AC, 1 click and silence.

          Tried turning the TV on and got some buzzing from the back of the set, then something went 'pop' with a small amount of smoke on the Y-main board.

          Not sure what the part is in the attached photo (Q5501) - but it doesn't look so good anymore :P
          Attached Files
          Last edited by psmedley; 07-14-2012, 12:18 AM.

          Comment

          • psmedley
            Senior Member
            • Apr 2012
            • 144
            • Australia

            #85
            Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

            I see Y-Sus repair kits like

            Comment

            • psmedley
              Senior Member
              • Apr 2012
              • 144
              • Australia

              #86
              Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

              Interestingly, when replacing the bulged 680uf 25v capacitor on the Ysus board, I did notice some dark/brown patches underneath Q5501 which is now blown - so this mosfet has obviously been running hot.

              From what I've read, I should be able to replace this mosfet, however will need to most likely replace both Y buffer boards?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #87
                Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                Originally posted by psmedley
                Interestingly, when replacing the bulged 680uf 25v capacitor on the Ysus board, I did notice some dark/brown patches underneath Q5501 which is now blown - so this mosfet has obviously been running hot.

                From what I've read, I should be able to replace this mosfet, however will need to most likely replace both Y buffer boards?
                Check your Y buffers for shorts, it's possible they're okay. Seems like you've got a really tricky set here!
                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

                • psmedley
                  Senior Member
                  • Apr 2012
                  • 144
                  • Australia

                  #88
                  Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                  Originally posted by tom66
                  Check your Y buffers for shorts, it's possible they're okay. Seems like you've got a really tricky set here!
                  Any tips on how to check the Y buffers for shorts?

                  I must say, this set is really testing by confidence - I was quick cocky after fixing the 32" plasma :P

                  I also need to try and work out if Q5501 is the only messed up part on the Ysus or if I should bite the bullet and just order something like http://www.ebay.com.au/itm/271002634287

                  Comment

                  • psmedley
                    Senior Member
                    • Apr 2012
                    • 144
                    • Australia

                    #89
                    Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                    OK:
                    Q5500
                    Q5302
                    Q5303
                    Q5304
                    Q5306

                    all appear to be shorted and Q5501 is blown - so the ebay auction is looking better and better...

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #90
                      Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                      I'd throw out the Jackcon caps though! Looks okay.

                      Testing for shorts isn't too difficult:
                      http://blog.coppelltvrepair.com/2010...er-boards.html
                      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

                      • psmedley
                        Senior Member
                        • Apr 2012
                        • 144
                        • Australia

                        #91
                        Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                        hmmm doesn't look too promising for the buffers...

                        Depending which pins I test on the upper board I'm getting either 0, or 5k ohms or 10k ohms.

                        lower board on some pins I get open loop, others 0.

                        If I need to replace buffers + repair ysus it's starting to get a little expensive and perhaps not worthwhile

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #92
                          Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                          Originally posted by psmedley
                          hmmm doesn't look too promising for the buffers...

                          Depending which pins I test on the upper board I'm getting either 0, or 5k ohms or 10k ohms.

                          lower board on some pins I get open loop, others 0.

                          If I need to replace buffers + repair ysus it's starting to get a little expensive and perhaps not worthwhile
                          Post pictures of your buffers, maybe you're testing the wrong places.
                          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

                          • psmedley
                            Senior Member
                            • Apr 2012
                            • 144
                            • Australia

                            #93
                            Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                            Photos of buffers attached.

                            The connectors look pretty similar to the Coppell photos...
                            Attached Files

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #94
                              Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                              A good place to check would be across that red cap.
                              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

                              • psmedley
                                Senior Member
                                • Apr 2012
                                • 144
                                • Australia

                                #95
                                Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                                all 4x red caps read OL

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #96
                                  Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                                  So they're probably not blown but just to be sure check this; any pin along red to blue, both ways.
                                  Attached Files
                                  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

                                  • psmedley
                                    Senior Member
                                    • Apr 2012
                                    • 144
                                    • Australia

                                    #97
                                    Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                                    Will do... so basically top half of connector to bottom half...

                                    Which is not what http://www.coppelltvrepair.com/data/...2-01203A-1.jpg shows

                                    Comment

                                    • psmedley
                                      Senior Member
                                      • Apr 2012
                                      • 144
                                      • Australia

                                      #98
                                      Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                                      Originally posted by tom66
                                      I'd throw out the Jackcon caps though! Looks okay.
                                      btw I'd already replaced the 680uf 25v caps with Rubycon ZL's as two of the three were already bulged, so the jackson's WILL be going straight into the bin

                                      Comment

                                      • psmedley
                                        Senior Member
                                        • Apr 2012
                                        • 144
                                        • Australia

                                        #99
                                        Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                                        Originally posted by tom66
                                        So they're probably not blown but just to be sure check this; any pin along red to blue, both ways.
                                        lower buffer board - either OL or reading in megaohms
                                        upper buffer board - top pins to bottom 3 pins = 5 ohms. Once I go to fourth pin from bottom, pins have high resistance (min 10k, some M or OL)

                                        Comment

                                        • psmedley
                                          Senior Member
                                          • Apr 2012
                                          • 144
                                          • Australia

                                          #100
                                          Re: 50" Samsung Plasma (model number PS50Q91HD) - possible purchase

                                          Shame there are no pin layouts to truly show what is power and earth to enable more accurate testing...

                                          Comment

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