Samsung HPT5054, HUGE PAIN IN THE ASS

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

    #21
    Re: Samsung HPT5054, HUGE PAIN IN THE ASS

    Added 60mm fan to it and heatsunk buffers, going to be doing a good video on how to repair these Ydrives and keep em lasting. You seen my PS50C96 repair video explains a little about these Ymains ?
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    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 !

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    • mmartell
      Badcaps Legend
      • Oct 2013
      • 3189
      • Canada

      #22
      Re: Samsung HPT5054, HUGE PAIN IN THE ASS

      It's customary to draw air over heatsinks instead of blow on them to reduce dust accumulation buy I'm sure you already knew that Reecey

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

        #23
        Re: Samsung HPT5054, HUGE PAIN IN THE ASS

        I did, but they get soo hot which as you know heat = bang especially in these Tv's

        I did that as it will keep them fets which all together dissipate 180 plus watts on to a crappy heatsink which gets soo hot to the point where it burns your hand, I normally put fans to extract air but this time did it on the heatsink. Just to help the set last longer.

        Also the gap between the fins on the heatsink is big so it would take many many years to even get close to blocking that up matey
        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 !

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        • Truncatedhose
          Badcaps Veteran
          • Oct 2014
          • 343
          • United States

          #24
          Re: Samsung HPT5054, HUGE PAIN IN THE ASS

          Originally posted by ReeceyBurger123
          Psu will have Vg. Y main is failed, I have the same set here to fix same issue Will be doing video on it. Theres 5 transistors on the lower smaller Ymain heatsink that normally fail test them.
          Thank you, Reecey. I will pull the Y-main and test those fets, but this is a board I already replaced, but I suppose it could be a bad one. I'm still mystified as to how the TV could maintain full VS and VA voltage and not go into shutdown with shorts on the Y-Main. I will report back.

          Comment

          • Truncatedhose
            Badcaps Veteran
            • Oct 2014
            • 343
            • United States

            #25
            Re: Samsung HPT5054, HUGE PAIN IN THE ASS

            Okay, so I pulled the Y-Main and the fets you mentioned all test good, no shorts. I tested everything on heatsink, too and still found no shorts. How should they read? Dead short or...? I tried different combinations and no shorts in diode check and in resistance they all seem to be 10k ohms to 230k ohms depending on which pins I'm checking. They don't need to be desoldered to be tested, right? Also, this is a board that I got from a distributor who obviously had rebuilt it as those fets have been resoldered (likely replaced) and that capacitor in the corner (common failure) has been replaced. The soldering on some of this stuff was pretty sloppy, so I redid it, but doubt that's the issue. I DO have a logic board on the way, to rule that out, but...

            You are sure that solid green LED on the Y-Main indicates a problem with it? What should I do next?

            Comment

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

              #26
              Re: Samsung HPT5054, HUGE PAIN IN THE ASS

              Right do you know how to test the buffer ? I have the set I mention yesterday (not the one I did the fan mod on) Ymain shutting down top two buffer Ics are shorted causing Ymain to lock out.
              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/

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              • mmartell
                Badcaps Legend
                • Oct 2013
                • 3189
                • Canada

                #27
                Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                If the green led on the ymain is lit even without buffers connected then yes you still have an issue with your ymain.

                Comment

                • Truncatedhose
                  Badcaps Veteran
                  • Oct 2014
                  • 343
                  • United States

                  #28
                  Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                  Originally posted by ReeceyBurger123
                  Right do you know how to test the buffer ? I have the set I mention yesterday (not the one I did the fan mod on) Ymain shutting down top two buffer Ics are shorted causing Ymain to lock out.
                  Well, I did repull the buffers when I repulled the YMain and tested them again. I wanted to make sure that the upper buffer that I had had repaired was good and not shorted (had sent it into an ebay repair service because I don't do the chip replacements; it's very inexpensive to have one done with an ebay repair service).

                  I think I know how to test them correctly. Find a good ground for the buffer ICs by probing between the bottom of the board, right under one of the ICs where they are attached to the large ground trace and find one side of a capacitor on the topside that connects to that ground, then test between that ground point and all the pins of the connectors in diode check to see if any pins are shorted. I tested both buffers and didn't find any shorts that way.

                  Comment

                  • Truncatedhose
                    Badcaps Veteran
                    • Oct 2014
                    • 343
                    • United States

                    #29
                    Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                    Originally posted by mmartell
                    If the green led on the ymain is lit even without buffers connected then yes you still have an issue with your ymain.
                    Any suggestions?

                    Comment

                    • mmartell
                      Badcaps Legend
                      • Oct 2013
                      • 3189
                      • Canada

                      #30
                      Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                      The greed led is lit WITHOUT either of the buffers connected ?

                      Comment

                      • Truncatedhose
                        Badcaps Veteran
                        • Oct 2014
                        • 343
                        • United States

                        #31
                        Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                        Originally posted by mmartell
                        The greed led is lit WITHOUT either of the buffers connected ?
                        I will check that and get back to you.

                        Comment

                        • Truncatedhose
                          Badcaps Veteran
                          • Oct 2014
                          • 343
                          • United States

                          #32
                          Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                          Originally posted by mmartell
                          The greed led is lit WITHOUT either of the buffers connected ?
                          Okay, I unplugged both of the buffers (completely removed them from the TV) and then the green LED on the Ymain board DOES NOT light. If the buffers are installed and connected, the green LED on the Ymain lights and stays solid.

                          What do you think this means? Thank you so much for the help!

                          Comment

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

                            #33
                            Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                            Shorted buffer.
                            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/

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                            • mmartell
                              Badcaps Legend
                              • Oct 2013
                              • 3189
                              • Canada

                              #34
                              Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                              +1

                              Comment

                              • Truncatedhose
                                Badcaps Veteran
                                • Oct 2014
                                • 343
                                • United States

                                #35
                                Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                                Originally posted by ReeceyBurger123
                                Shorted buffer.
                                A shorted buffer? Really? Well, can you help me determine where the short is or which buffer board? As I said, I had the upper one repaired by an ebay repair service, but I've retested both of them and didn't find any shorts. Can someone verify my testing method or help me out here? Thanks!

                                Comment

                                • Truncatedhose
                                  Badcaps Veteran
                                  • Oct 2014
                                  • 343
                                  • United States

                                  #36
                                  Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                                  Well, I rechecked the buffers AGAIN and AGAIN, talking with another tech about my meter and testing method and I found that I had somehow skipped over a pin and missed a short on the lower buffer board. The problem was me assuming that chirp from the meter was just another diode junction that are common on these boards, when this particular one was actually a short; I just didn't leave the meter there long enough!

                                  So, sure enough, you guys were right, a buffer was bad after all! Thank you for the help! I am going to get a lower buffer and I will report back!

                                  Comment

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

                                    #37
                                    Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                                    Right plug the set back in now and check them Ydrive voltages ! They are:

                                    VSC
                                    YUP
                                    YDN
                                    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/

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                                    • mmartell
                                      Badcaps Legend
                                      • Oct 2013
                                      • 3189
                                      • Canada

                                      #38
                                      Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                                      On this set you can run with upper buffer so give that a go. If your upper is good then no green led on ysus.

                                      Comment

                                      • Truncatedhose
                                        Badcaps Veteran
                                        • Oct 2014
                                        • 343
                                        • United States

                                        #39
                                        Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                                        TV works with a new lower buffer, thanks all of you! Thanks so much!

                                        Reecey, I didn't check those voltages, but thanks for all your help!

                                        Comment

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

                                          #40
                                          Re: Samsung HPT5054, HUGE PAIN IN THE ASS

                                          Awesome work
                                          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/

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