Samsung PS42A410 has sound but no picture

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Samsung PS42A410 has sound but no picture

    OK, you found a fault!
    Please unplug the buffer board and see if the readings settle or if they are still bad.
    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

    • nick1969
      Member
      • Jun 2012
      • 30
      • Australia

      #22
      Re: Samsung PS42A410 has sound but no picture

      Excellent, Thanks for helping i feel we are making progress

      Removed buffer and powered up still 9 volts on VSCAN and VSCH same jumping around 40v mark as before

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Samsung PS42A410 has sound but no picture

        So you probably have a bad Y-main board and maybe a bad Y-buffer.

        You should test your buffer board. Here is how to do a test:
        https://www.youtube.com/watch?v=51SZsfH60EY
        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

        • Ltank
          Badcaps Veteran
          • Jun 2013
          • 776
          • USA

          #24
          Re: Samsung PS42A410 has sound but no picture

          So. When checking SMPS voltages you have the standby voltage and the 15 CDC but no high voltage?
          There are feedback voltages to the SMPS. Turn off power, wait several minutes for capacitors to discharge. Use your DVM and check for a short across the HV dcv input to the Y or SC. Board. If OK check for short on the Z board. Once the faulty board is located, it can be trouble shooted to component level.
          Ltank

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: Samsung PS42A410 has sound but no picture

            Originally posted by Ltank
            So. When checking SMPS voltages you have the standby voltage and the 15 CDC but no high voltage?
            There are feedback voltages to the SMPS. Turn off power, wait several minutes for capacitors to discharge. Use your DVM and check for a short across the HV dcv input to the Y or SC. Board. If OK check for short on the Z board. Once the faulty board is located, it can be trouble shooted to component level.
            Ltank
            There are no shorts on the Vs on this panel as there is 208V going to the Y-main, so detailed analysis of the Y-main is necessary to determine where the fault is.
            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

            • nick1969
              Member
              • Jun 2012
              • 30
              • Australia

              #26
              Re: Samsung PS42A410 has sound but no picture

              Thanks so much guys
              Ok I checked the buffer And there doesn't seem to be any shorts
              I did find something strange the VSCAN solder tab where I tried to measure the voltage from that was showing 0 volts goes to ground
              Here's a picture from the solder tab labeled VSCAN on the Y board
              Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: Samsung PS42A410 has sound but no picture

                Yeah, the 0V there is bad.
                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

                • storexxm
                  Senior Member
                  • Oct 2012
                  • 107
                  • Vienna

                  #28
                  Re: Samsung PS42A410 has sound but no picture

                  Originally posted by tom66
                  Yeah, the 0V there is bad.
                  Hello. Did you solve the Problem?
                  I habe the same issue.. black screen with sound

                  Comment

                  • storexxm
                    Senior Member
                    • Oct 2012
                    • 107
                    • Vienna

                    #29
                    Re: Samsung PS42A410 has sound but no picture

                    please can someone help me?
                    i swapped cm402, cb402, cm408, cm405, cm401 and cb801
                    after putting it together it worked for an hour.
                    then back to clicking sound and no screen just audio.
                    then swapped cb809, cb808, cb807 and cb806
                    no change any more...
                    any suggestions?
                    please

                    Comment

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