Hannspree HSG1143 repair, no power, blown IC905

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  • Chungalin
    Badcaps Veteran
    • Jul 2014
    • 422
    • Spain

    #1

    Hannspree HSG1143 repair, no power, blown IC905

    This 42" LCD TV had no power, possibly due to a surge. Power supply is labeled as 715G3858-P01-W30-003U.

    5A main fuse open, but the main problem here is that IC905 (DIP-8 PWM regulator) has violently blown and the top layer has disappeared, making impossible to identify it. Sometimes I find the pieces inside the cover and I’m able to reconstruct its "face", but no luck this time.

    I google a bit and I find I’m not the only one. Finally there’re two sources stating this is a Power Integrations TNY277PN (or TNY277PG, it’s functionally the same). Also recommend to check zener ZD907 (Philips BZX79-C9V1). No problems with other diodes. I just detect that one of the 3 main 450V filter caps has subtly leaked through one leg (none bulged). I replace it.

    Since I don’t have any TNY277, I try with a TNY275. This is the Standby regulator, so it’s expected that 15W should be enough. I try it briefly and it works. Then I order the right IC, just for peace of mind.
  • jellytot
    Member
    • Mar 2015
    • 42
    • Ireland

    #2
    Re: Hannspree HSG1143 repair, no power, blown IC905

    Hi Chungalin. I've got exactly the same fault condition on a Hsg1142 set with the same PS. must be a weakness with these supplies resulting in catastrophic failure with chopper ic905. mine is also decapitated with zd907 partially shorted or leaky.

    Comment

    • Chungalin
      Badcaps Veteran
      • Jul 2014
      • 422
      • Spain

      #3
      Re: Hannspree HSG1143 repair, no power, blown IC905

      Thanks for reporting your case. Sometimes the aim of creating this threads is to detect "trending" failures in some models.

      Comment

      • ptrain
        New Member
        • Jun 2017
        • 7
        • Ireland

        #4
        Re: Hannspree HSG1143 repair, no power, blown IC905

        Hey guys sorry to drag this one up. I've just had this issue with my hannspree, I've replaced all the components mentioned and the TV is working again! Thanks!!

        However it's now making a high pitched whistle from the power board, any ideas what might be causing that? I don't even know where to start.
        Thanks

        Comment

        • Chungalin
          Badcaps Veteran
          • Jul 2014
          • 422
          • Spain

          #5
          Re: Hannspree HSG1143 repair, no power, blown IC905

          Try replacing the electrolytic cap that is very close to IC905. High frequency noise from PSU usually means bad caps in primary side. Have you replaced all 3x68uF/450V main filter caps?

          Comment

          • ptrain
            New Member
            • Jun 2017
            • 7
            • Ireland

            #6
            Re: Hannspree HSG1143 repair, no power, blown IC905

            Thanks I'll order those.
            I've done some checking with the ohmmeter, one of the little smd caps right beside the ic905, it's resistance is not dropping to 0. The seemingly identical one beside it does tend towards 0. Could this be an issue? How can I tell what smd to replace it with. The board says c948

            Comment

            • Chungalin
              Badcaps Veteran
              • Jul 2014
              • 422
              • Spain

              #7
              Re: Hannspree HSG1143 repair, no power, blown IC905

              Capacitors cannot be checked with ohmmeter, unless they’re shorted, which is something rather unlikely. Check other threads about ESR. Anyway, if you have doubts, just replace them. I wouldn’t care about SMD caps at this moment, before you have ruled out electrolytic ones.

              Comment

              • ptrain
                New Member
                • Jun 2017
                • 7
                • Ireland

                #8
                Re: Hannspree HSG1143 repair, no power, blown IC905

                Thanks for all the help mate!

                I've ordered a heap of different ones to try. Also got a cheap cap tester. Hopefully I can sort it now.

                Comment

                • ptrain
                  New Member
                  • Jun 2017
                  • 7
                  • Ireland

                  #9
                  Re: Hannspree HSG1143 repair, no power, blown IC905

                  I've taken out and tested all the electrolytic type caps, they all check out ok with the tester. Is there anything else to look at? I think the sound seems to be coming from one of the transformers.

                  Comment

                  • ptrain
                    New Member
                    • Jun 2017
                    • 7
                    • Ireland

                    #10
                    Re: Hannspree HSG1143 repair, no power, blown IC905

                    The whistling is coming from this thing, 738174-183N etc etc.
                    See the photo.
                    Attached Files

                    Comment

                    • ptrain
                      New Member
                      • Jun 2017
                      • 7
                      • Ireland

                      #11
                      Re: Hannspree HSG1143 repair, no power, blown IC905

                      Update, TV working perfect now.

                      I put it all back together was just about to go buy a new one and said I'll leave it on while I was cleaning up all my testing gear. It was on for about 5 mins with the bad whistle, then there was a pop and the whistle stopped. TV 100% now

                      Comment

                      • dskall
                        Badcaps Legend
                        • Oct 2016
                        • 2905
                        • usa

                        #12
                        Re: Hannspree HSG1143 repair, no power, blown IC905

                        Not sure if that pop was a good thing, but whatever works
                        I assume no responsibility for any stupid suggestions I might post.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Hannspree HSG1143 repair, no power, blown IC905

                          That is the inductor for the PFC, I wonder if the PFC boosted Voltage is still present after the 'POP'.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment

                          • Chungalin
                            Badcaps Veteran
                            • Jul 2014
                            • 422
                            • Spain

                            #14
                            Re: Hannspree HSG1143 repair, no power, blown IC905

                            Never heard any POP that "fixed" something.

                            Comment

                            • ptrain
                              New Member
                              • Jun 2017
                              • 7
                              • Ireland

                              #15
                              Re: Hannspree HSG1143 repair, no power, blown IC905

                              A month on now and the TV is still fine.

                              Comment

                              • Branko Sudic
                                New Member
                                • Feb 2019
                                • 2
                                • Serbia

                                #16
                                Re: Hannspree HSG1143 repair, no power, blown IC905

                                After replacement IC905 and ZD907 i had the same problem wisting sound. I found that D991 ( 2A05 ) leaky! I put MUR460 and sound disaperad.

                                Comment

                                • Fesmitronica
                                  New Member
                                  • Oct 2021
                                  • 3
                                  • Portugal

                                  #17
                                  Re: Hannspree HSG1143 repair, no power, blown IC905

                                  Hello
                                  This is my first post and need help.
                                  Have the same problem with the IC905 BLOW , switch to TNY280PN because the TNY277PN is out of stock and the ZD907 with a leak and i have 3.6V with a lot of noise.
                                  Already saw resistors , capacitors , pc817 , kia431 and everything is ok but te standby voltage are to low.
                                  Someone can help me with some ideas??

                                  Comment

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