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    #1

    Monitor lamps' faults

    Samsung 920NW
    I'm repairing a few of these.
    Basically, ALL offer the same fault: on for a few seconds - or minutes - and off or intermittent.
    Some have power caps problems, but I found out the screen lamps are basically the problem.
    My question:
    Monitor goes off because internal sparking in the faulty lamp?
    [See picture of one such lamp]



    ...
    Circuit diagram of unit
    https://cdn.badcaps-static.com/pdfs/...ea6655b7ee.pdf
    Attached Files
    Tags: None
    #2
    Re: Monitor lamps' faults

    Originally posted by burntfingers View Post
    My question:
    Monitor goes off because internal sparking in the faulty lamp?
    You are experiencing 2 seconds to black.

    The inverter pwm circuit works as an "all or nothing" meaning all ccfls work or none at all.

    As ccfl bulb age, they draw more current. They look like your picture. Alternatively, the wiring can be bad. See

    http://s807.photobucket.com/albums/y...klight%20lamp/

    Replacements (bare or pre-harnessed) can be found at ccflwarehouse.com, ccfldirect.com, and ebay. The first has good feedback from members here.
    Last edited by retiredcaps; 12-04-2011, 02:21 AM. Reason: add suppliers
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    Comment

      #3
      Re: Monitor lamps' faults

      yes those lamps look tired.
      another clue is pink/orange startup.mercury starved.

      Comment

        #4
        Re: Monitor lamps' faults

        Thank you.
        When you hear the lamp arcing [and it smells], but is still working fine, should it be replaced right away or not?

        Comment

          #5
          Re: Monitor lamps' faults

          you are this far into the unit.i would replace the lamps.the smell is arcing from insulation breakdown.replace the boots too.
          http://www.ccfldirect.com/index.html
          http://www.ccflwarehouse.com/
          these are the 2 i use.

          Comment

            #6
            Re: Monitor lamps' faults

            Was told no stock for these lamps - the guy informed "Considered to be a 50,000 hour life part & non serviceable."
            Oh!...

            Why not some product to insulate the terminals, something better than rubber?
            I tried plastic insulation used on high voltages, lopts, etc, but the space doesn't allow it.
            It would work... for a while, I guess.
            Attached Files

            Comment

              #7
              Re: Monitor lamps' faults

              Originally posted by burntfingers View Post
              Was told no stock for these lamps - the guy informed "Considered to be a 50,000 hour life part & non serviceable."
              Oh!...
              Who did you contact?
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              Comment

                #8
                Re: Monitor lamps' faults

                Ny normal supplier; Screenvision - Johannesburg.

                Comment

                  #9
                  Re: Monitor lamps' faults

                  The lamps' cables were the problem with this monitor.
                  I've now repaired quite a few by resoldering them.
                  Most of the time it is only one on the top lamps, which is either burned or disconnected, just sitting on the lamp's terminal causing arcing.
                  It is a delicate job to unglue the wires and remove the two lamps; they can brake easily.

                  Note: the burned wire [or lose connection] is on the other side of the lamp, not on the side of the plug.
                  Attached Files
                  Last edited by burntfingers; 12-22-2011, 11:57 AM. Reason: To add note

                  Comment

                    #10
                    Re: Monitor lamps' faults

                    Originally posted by burntfingers View Post
                    Note: the burned wire [or lose connection] is on the other side of the lamp, not on the side of the plug.
                    If that is the thinner guage wire, that is the return wire. This is consistent with what alexanna reports.

                    Good job on the repair work. I tried one and gave up. Too delicate for me and my soldering equipment sucks.
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                    Comment

                      #11
                      Re: Monitor lamps' faults

                      Originally posted by retiredcaps View Post
                      If that is the thinner guage wire, that is the return wire. This is consistent with what alexanna reports.

                      Good job on the repair work. I tried one and gave up. Too delicate for me and my soldering equipment sucks.
                      Yes, indeed, delicate, but I had 60 to repair and had to manage a way.
                      So far, I have repaired 40, and tested them for many hours.
                      The set is made/assembled in China, and I was thinking of bad workmanship the origin for the fault [or poor quality cable], what do you think?

                      Comment

                        #12
                        Re: Monitor lamps' faults

                        Originally posted by burntfingers View Post
                        The set is made/assembled in China, and I was thinking of bad workmanship the origin for the fault [or poor quality cable], what do you think?
                        I don't know. There are so many variables. It could be

                        a) lead free solder
                        b) poor quality wiring
                        c) poor soldering techniques leading to cold joints
                        d) poor workmanship
                        e) too thin wiring (we rarely see the high voltage thicker guage wiring fray)
                        f) too much solder or too little solder
                        g) poor design

                        Good job on the 40. That is 40 more than I will ever repair.

                        I'm more likely to replace it with a pre-harnessed solution.
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                        Comment

                          #13
                          Re: Monitor lamps' faults

                          Just curious.. who's the panel manufacturer?

                          My bet is on Chi Mei or Chungwha .. had so many problems with these 2..

                          Comment

                            #14
                            Re: Monitor lamps' faults

                            Originally posted by Scenic View Post
                            Just curious.. who's the panel manufacturer?

                            My bet is on Chi Mei or Chungwha .. had so many problems with these 2..
                            Apparently, InnoLux ... never heard about them.
                            Attached Files

                            Comment

                              #15
                              Re: Monitor lamps' faults

                              Chimei Innolux Corporation : http://www.chimei-innolux.com/opencm...t/?__locale=en

                              Comment

                                #16
                                Re: Monitor lamps' faults

                                Originally posted by mariushm View Post
                                Chimei Innolux Corporation : http://www.chimei-innolux.com/opencm...t/?__locale=en
                                Oh, so Chimei and Innolux are one and the same company!
                                Now I know.
                                Thanks for the link; appreciated.

                                Comment

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