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17MB130T , Vestel main board audio issue.Schematic & advice please

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    17MB130T , Vestel main board audio issue.Schematic & advice please

    Hi all .

    Volume keeps being pulled to zero .

    Removed toggle control & audio chip ( AD82587D ) , which is IC2 BUS controlled , but no change .

    Also disconnected I/R Receiver .

    Measured DC voltage on all pads where the audio chip lives ( see picture )

    Only ones that differ from measurements on a working board , are pins 15 ( RA ) , 17 ( RB ) , 20 ( LB ) & 22 ( LA )

    All at zero volts on faulty board , but that may be due to chip removed .

    On fully working board , above pins all at 12 volts .

    Headphone port also seems good .
    Attached Files

    #2
    Re: 17MB130T , Vestel main board audio issue.Schematic & advice please

    Check components above and around the QR code as the place to the left is where the external button socket goes maybe be something there

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      #3
      Re: 17MB130T , Vestel main board audio issue.Schematic & advice please

      Thanks , will do .

      Also forgot to mention that the silicon type heat sink pads under the PCB had leaked out slightly .

      Washed the board down using IPA solvent , but there's is a possibility that the main CPU could have been damaged by the leak .

      Hope not , as it would be game over , & would need to replace SSB .

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        #4
        Re: 17MB130T , Vestel main board audio issue.Schematic & advice please

        Hi.

        remove r463 3V3 keyboard supply. if still volume goes 0 cpu is faulty.

        Diagram : https://drive.google.com/open?id=1RE...I54Wnqnfp1MdhH
        https://www.badcaps.net

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          #5
          Re: 17MB130T , Vestel main board audio issue.Schematic & advice please

          Hello & thanks for reply. Carried out test , but fault persists .

          Suspect the ARM manufactured CPU , most likely damaged by leakage .

          Swapped out the board & all working , on test .
          Attached Files

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