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EMPREX LM-1905 will not turn on

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    #1

    EMPREX LM-1905 will not turn on

    The monitor will not turn on, have checked the power cable and the VGA cable both are fine.

    The power on LED seems very dull and then goes out after a little while so i am assuiming there is a problem with the supply?

    I have disassembled the monitor and on what appears to be the PSU PCB board, I have noticed that there are various caps that are buldging. So i intend to replace these. I have also checked the internal fuse which appears to be fine also.

    2 x 10v 1000uf
    2 x 25v 680uf
    2 x 25v 220uf
    2 x 25v 470uf
    2 x 450v 100uf
    2 x 25v 47uf
    2 x 16v 470uf
    2 x 16v 22uf

    I have also notice a discolouration of the PCB board under two of the caps and two of the IC's.

    I was going to install a chip holder and replace the two IC's which are 4511GED but i cant appear to source these from anywhere?

    Does anyone know where i can source these IC's or a like for like replacement?

    I will post pictures when i get home but i am unable to do this at present.

    Cheers

    Dan
    Tags: None
    #2
    Re: EMPREX LM-1905 will not turn on

    We will wait on the pictures. I kind of doubt it is the ICs. Need to check those pictures before settling on the next action.

    Comment

      #3
      Re: EMPREX LM-1905 will not turn on

      Originally posted by dannycelluk View Post
      The monitor will not turn on, have checked the power cable and the VGA cable both are fine.

      The power on LED seems very dull and then goes out after a little while so i am assuiming there is a problem with the supply?

      I have disassembled the monitor and on what appears to be the PSU PCB board, I have noticed that there are various caps that are buldging. So i intend to replace these. I have also checked the internal fuse which appears to be fine also.

      2 x 10v 1000uf
      2 x 25v 680uf
      2 x 25v 220uf
      2 x 25v 470uf
      2 x 450v 100uf
      2 x 25v 47uf
      2 x 16v 470uf
      2 x 16v 22uf

      I have also notice a discolouration of the PCB board under two of the caps and two of the IC's.

      I was going to install a chip holder and replace the two IC's which are 4511GED but i cant appear to source these from anywhere?

      Does anyone know where i can source these IC's or a like for like replacement?

      I will post pictures when i get home but i am unable to do this at present.

      Cheers

      Dan
      Check this site http://www.utsource.net/ic-datasheet...D-1885942.html

      Comment

        #4
        Re: EMPREX LM-1905 will not turn on

        Cheers for the quick reply

        The board looks identical to the board posted here....

        https://www.badcaps.net/forum/showth...ghlight=EMPREX

        But the brown colouration on the board is next to the 2 caps on the right hand side next to the IC's on pic 3.

        Comment

          #5
          Re: EMPREX LM-1905 will not turn on

          Change the caps,and try it, would not worry about the brown colour at this time.

          Comment

            #6
            Re: EMPREX LM-1905 will not turn on

            ok thanks, ill give it ago on picture two above there are a group 0f 5 Caps over to top left hand side of the board, these do not look like power caps to me as they are next to the headphone jack, can anyone confirm? or shall i change these as well?

            Comment

              #7
              Re: EMPREX LM-1905 will not turn on

              Those can be left alone.
              regards

              Comment

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