LG w1934s 2 second to black

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  • rdb89
    Member
    • Jan 2012
    • 10
    #1

    LG w1934s 2 second to black

    Hi, i've a problem with my lg w1934s monitor. It's the "famous" 2sec to black... the monitor power light stay on but the backligh disappear... yesterday i opened the monitor and i change the capacitors but the problem persist. I try all the CCFL singly and all of them works... I've made other test for example leave a single CCFL, the monitor turns on and after 2 sec the backlight disappear... what can i do? I've an iron solder and a DMM but i don't know how to use it becouse i'm noob in EE... i can make soldering but i don't know how to use a dmm
    Here there are some pic of board...
    Sorry for my english...
    Attached Files
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    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: LG w1934s 2 second to black

      2 seconds to black can be

      a) bad caps
      b) bad inverter transformer (marked in red paint are likely your secondary inverter pins)
      c) bad ccfls
      d) bad ccfl wiring (especially the return wire)

      All are explained starting with post #19 and #20 at (including how to use a multimeter)

      https://www.badcaps.net/forum/showthread.php?t=10419
      Attached Files
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        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271
          #3
          Re: LG w1934s 2 second to black

          There are lots of how to use a multimeter videos on youtube. I know, I have probably looked at them all when I first started.
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            • rdb89
              Member
              • Jan 2012
              • 10
              #4
              Re: LG w1934s 2 second to black

              ok, thanks for the reply. now i have the tester and i want to check for the 2 red points of transformer. How can i set the dmm? The videos on youtube on post #19 & #20 are not aviable
              Thanks and sorry for my noob

                Comment

                • PlainBill
                  Badcaps Legend
                  • Feb 2009
                  • 7034
                  • USA
                  #5
                  Re: LG w1934s 2 second to black

                  Set the DMM to the 2K ohms scale.

                  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

                    • rdb89
                      Member
                      • Jan 2012
                      • 10
                      #6
                      Re: LG w1934s 2 second to black

                      Hi, finally i found the problem... it was a ccfl that has gone... at the moment i broke my replacement... I buy a new CCFL but i must wait 1 month or more... is there any way to "isolate" the CCFL inverter transformer to give power only to the working CCFL? I think that i can use the monitor with 3 CCFL for the moment... Thanks...

                        Comment

                        • retiredcaps
                          Badcaps Legend
                          • Apr 2010
                          • 9271
                          #7
                          Re: LG w1934s 2 second to black

                          Originally posted by rdb89
                          is there any way to "isolate" the CCFL inverter transformer to give power only to the working CCFL?
                          Try at your own risk.

                          https://www.badcaps.net/forum/showthread.php?t=13713
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