Pioneer VSX- Shutdown after 1 minute- SMPS problem

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  • srt1
    Senior Member
    • Aug 2013
    • 177
    • india

    #1

    Pioneer VSX- Shutdown after 1 minute- SMPS problem

    Hi, I got pioneer VSX 1122 recently, it keeping power problem after a while power when i check inside i found that TOP258 ic is the root cause its overheating and causing shutdown the SMPS, i just checked the data sheet of TOP258, ther its clearly mention about thermal protection, i dont know what causing TOP258 overheat , is it because internal fault of top258?
  • rievax_60
    Badcaps Veteran
    • May 2012
    • 897
    • australia

    #2
    Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

    It can be a fault with the TOP258. I have seen this many times with Power-Integration SMPS ICs. Or there might be high ripple on the secondary rail because of high capacitor ESR.

    Comment

    • srt1
      Senior Member
      • Aug 2013
      • 177
      • india

      #3
      Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

      Originally posted by rievax_60
      It can be a fault with the TOP258. I have seen this many times with Power-Integration SMPS ICs. Or there might be high ripple on the secondary rail because of high capacitor ESR.
      I got new TOP258 , i will replace and let you know the result

      Comment

      • srt1
        Senior Member
        • Aug 2013
        • 177
        • india

        #4
        Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

        I replaced TOP258 with new one, now everything fine no over heating no shurdown.

        Comment

        • DjKrish
          Badcaps Veteran
          • Oct 2012
          • 354
          • SG

          #5
          Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

          Dont forget to check the caps around for high ESR to prevent the TOP from blowing again.

          Comment

          • srt1
            Senior Member
            • Aug 2013
            • 177
            • india

            #6
            Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

            Originally posted by DjKrish
            Dont forget to check the caps around for high ESR to prevent the TOP from blowing again.
            Ok , thank you

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

              Always inspect the snubber circuit too.
              https://www.badcaps.net/forum/showthread.php?t=64602
              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

              • srt1
                Senior Member
                • Aug 2013
                • 177
                • india

                #8
                Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

                Originally posted by budm
                Always inspect the snubber circuit too.
                https://www.badcaps.net/forum/showthread.php?t=64602
                Can you please Explain where is snubber circuit

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem

                  Just download the specsheet of the IC:
                  https://cdn.badcaps-static.com/pdfs/...1193a9ddeb.pdf
                  Look at Application Examples and read about the Clamping network.

                  Also study more here:
                  https://www.eetimes.com/author.asp?doc_id=1280601
                  https://www.maximintegrated.com/en/a...dex.mvp/id/848
                  https://www.digikey.com/en/articles/...power-switches
                  Last edited by budm; 10-10-2017, 10:46 PM.
                  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

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