Samsung 2232BW - Power light

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  • JoeyJoe
    Senior Member
    • Sep 2012
    • 76
    • United Kingdom

    #1

    Samsung 2232BW - Power light

    Just a quick question.

    The monitors power light comes on as soon as it is plugged in, but nothing happens if you press it.

    I've seen before monitors with bad caps / transformers that when you press the power button, at least the LED turns on and off.

    Would this indicate something else is wrong with this monitor?

    Joe
  • addytzu123
    Senior Member
    • Mar 2013
    • 54
    • ROMANIA

    #2
    Re: Samsung 2232BW - Power light

    Hi,
    There can be a number of faults here, but from the little infos you gave, if the On LED comes straight up when you plug the cord, could indicate a corrupt eeprom software (being a Samsung monitor). However nothing is for sure until you start measuring all the voltages from PS and from the voltage regulators from the main board!
    In a transistor circuit protected by a fuse, the transistor will always blow to protect the fuse.

    Comment

    • JoeyJoe
      Senior Member
      • Sep 2012
      • 76
      • United Kingdom

      #3
      Re: Samsung 2232BW - Power light

      Ah I see.

      Who ever had the monitor before me had removed the caps, (I presume to test them), and looks like they couldn't find the problem. There are 2 inverters so I guess they are both fine.

      I tried to look for a picture on the screen with a light, but couldn't see anything.

      I did suspect the logic board being the problem. I will look though my other monitors to see if I can find a compatible one.

      Also is there a guide to which voltages to check?

      Comment

      • JoeyJoe
        Senior Member
        • Sep 2012
        • 76
        • United Kingdom

        #4
        Re: Samsung 2232BW - Power light

        Checked the 13.5V and it is 14v. I assume this is normal. Is there a way to force the power board to turn on the inverters so I can see if the board is working normally? There is a "ON" pin on the logic connector.

        I checked some of the voltages on the logic board, 13.5v is at 13.9v, but the 2x 5v pins on the logic board aren't getting anything.

        Update: Bridged a 3.3v from the logic board to the ON pin, and the backlight turns on. You were right addytzu123! Logic board it is!
        Last edited by JoeyJoe; 09-24-2013, 05:27 AM.

        Comment

        • addytzu123
          Senior Member
          • Mar 2013
          • 54
          • ROMANIA

          #5
          Re: Samsung 2232BW - Power light

          First of all see attached link for service manual, see what voltages you should get at the input connector from the PS, and provide clear pictures of your boards, so other users can help you with more targeted advices.

          http://elektrotanya.com/samsung_2232.../download.html

          Wait a minute, then press "Get manual" link

          Cheers
          In a transistor circuit protected by a fuse, the transistor will always blow to protect the fuse.

          Comment

          • JoeyJoe
            Senior Member
            • Sep 2012
            • 76
            • United Kingdom

            #6
            Re: Samsung 2232BW - Power light

            I will get some pictures shortly.

            The voltages suggest the PSU is working fine. The logic board, not so much.

            Comment

            • JoeyJoe
              Senior Member
              • Sep 2012
              • 76
              • United Kingdom

              #7
              Re: Samsung 2232BW - Power light

              Funny enough, just received another exact same monitor in the post. I think this one has a bad PSU, so should be able to get 1 out of the two!

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Samsung 2232BW - Power light

                Look for bad caps:
                http://s807.photobucket.com/user/bud...?sort=3&page=1
                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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