LG Flatron L1710s no display pulsing power led

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  • andy smethurst
    Member
    • Feb 2010
    • 49
    • Australia

    #1

    LG Flatron L1710s no display pulsing power led

    Hi, This monitor shows no display at all, but the power LED is blue and pulses off and on every 5 secs, or so. This is accompanied by a hissing sound and a click on the power board every time the power led pulses. The power to the logic board seems fine. Any ideas with this one would be appreciated.

    Regards: Andy.
  • PlainBill
    Badcaps Legend
    • Feb 2009
    • 7034
    • USA

    #2
    Re: LG Flatron L1710s no display pulsing power led

    Originally posted by andy smethurst
    Hi, This monitor shows no display at all, but the power LED is blue and pulses off and on every 5 secs, or so. This is accompanied by a hissing sound and a click on the power board every time the power led pulses. The power to the logic board seems fine. Any ideas with this one would be appreciated.

    Regards: Andy.
    This calls for the latest in high tech gear to troubleshoot. Use a sonic probe to locate the source of the hissing. Don't have a sonic probe handy? The core from a roll of paper towels or toilet paper makes a dandy substitute.

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

    Comment

    • steveburstons
      New Member
      • Aug 2012
      • 1
      • Australia

      #3
      Re: LG Flatron L1710s no display pulsing power led

      Originally posted by andy smethurst
      Hi, This monitor shows no display at all, but the power LED is blue and pulses off and on every 5 secs, or so. This is accompanied by a hissing sound and a click on the power board every time the power led pulses. The power to the logic board seems fine. Any ideas with this one would be appreciated.

      Regards: Andy.
      Hi Andy, I had a similar problem and from what you have described - it is a zener diode that is faulty on the power board, you can test if this is the case by either using an analogue multimeter to see if it has continuity in one direction only, if you don't have an analogue multimeter - remove it and re-assemble to test it (only for 20 seconds) no longer than this or will most likely fry the board, if it works after this test you will have to replace the zener diode with one of the same value as it is designed to work as a sort of circuit breaker also to keep the voltage polarity to one direction only, when they fail the voltage travels back and causes the board to freak out (power light blinking off and on, standby switch "clicking noise"). hope this helps.

      Comment

      • Rtech
        Badcaps Legend
        • Jul 2010
        • 1095

        #4
        Re: LG Flatron L1710s no display pulsing power led

        Which Zener ???

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870

          #5
          Re: LG Flatron L1710s no display pulsing power led

          @steveB You do realise you are replying to a post that is over 24 months old?
          Last edited by selldoor; 09-02-2012, 03:19 AM.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

          • Marsupial
            New Member
            • Jan 2012
            • 9
            • Canada

            #6
            Re: LG Flatron L1710s no display pulsing power led

            This thread might be 24 months old, but I have a L1710s with a similar issue... when it goes into power saving mode, it stays in power saving mode. Disconnecting sometimes brings it back to responsive, otherwise it stays with a blinking power led no matter if we send a signal.

            I am all for a recap job, but prefer understanding what's wrong before pulling out components. Right now all the caps seems to be just fine; is that zener story just some fairytale? How do we know for sure if its wrong and what diode are we talking about anyway?

            Comment

            • djkyle65
              New Member
              • Jan 2011
              • 1

              #7
              Re: LG Flatron L1710s no display pulsing power led

              Did you ever figure out this problem? Im having the same issue

              Thanks

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: LG Flatron L1710s no display pulsing power led

                @djkyle65: better post the pictures of your board so we see what is going on with it.
                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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