Samsung 226BW No Picture

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  • pedro042
    New Member
    • Feb 2011
    • 2
    #1

    Samsung 226BW No Picture

    Hey Guys, I have a Samsung 226BW that has no sign of life except that the power light flashes about once every 5 secs. The monitor doesn't respond to any of the buttons. All the caps on the IP baord have been replaced. The 13.5v output to the logic board is measuring 15.7v. Measuring the testpoint voltages on the logic board I've found the following:
    1.8v = 1.8v
    3.3v = 3.3v
    5v = 0v
    14v = 15.7v

    There is 5v (5.42v) present on the output of IC702 (DC-DC convertor).
    Unfortunately I can't locate a schematic, for the particular board, to be able to find where the 5v goes missing.
    I've search the forums and cannot find a solution to this particular issue.

    I have the same boards as shown in this message:
    https://www.badcaps.net/forum/showpo...5&postcount=10

    Thanks,
    Dave
    Tags: None
    • alexanna
      Member
      • Mar 2010
      • 1346
      #2
      Re: Samsung 226BW No Picture

      Do any of the voltages change with the logic board disconected?
      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

        Comment

        • Rtech
          Badcaps Legend
          • Jul 2010
          • 1095
          #3
          Re: Samsung 226BW No Picture

          Flashing Power lamp,indicates a problem in the Inverter circuit,eg shorted transistor etc,particularly as you have changed all the caps.

            Comment

            • pedro042
              New Member
              • Feb 2011
              • 2
              #4
              Re: Samsung 226BW No Picture

              Thanks very much for the quick reply guys.

              Originally posted by alexanna
              Do any of the voltages change with the logic board disconected?
              No change in voltage when the logic board is disconnected.

              Originally posted by Rtech
              Flashing Power lamp,indicates a problem in the Inverter circuit,eg shorted transistor etc,particularly as you have changed all the caps.
              I'll give them a look tomorrow. Any ideas what voltages I should be "seeing" on the Schottky Rectifier?

              Thanks,
              Dave

                Comment

                • alexanna
                  Member
                  • Mar 2010
                  • 1346
                  #5
                  Re: Samsung 226BW No Picture

                  These boards are huge problem for me getting solder to melt enough to remove the capacitors, and getting the new caps soldered back in has also caused me some problems.
                  Suggest you inspect your soldering very closely, gently rock the caps you have installed and watch for any movement on the solder pads.
                  Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                    Comment

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