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Dell 1900FP Monitor - BN44-00041A Inverter

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    #1

    Dell 1900FP Monitor - BN44-00041A Inverter

    First off, thanks to all posters who have provided me with an incredible source of information.

    I have the above monitor, unable to find with searching, which I understand is made by Samsung. Having been successful in repairing another Dell 172FBP (new transistors) I decided to try my hand at this one. Very similar problem, no visible screen just a flashing amber power light and a quick flash of light.

    This monitor has an external DC power supply. I took apart the monitor expecting a bad inverter board. It only has one electrolytic capacitor on it, 470uf, I believe and it looks ok, at least not leaking or bulging. I don't have an ESR meter or any real test equipment. The inverter board is almost all surface mount soldering other than this cap. The inverter board is BN44-00041A


    Any suggestions as to what might be the common fault with this monitor or inverter board.

    Thanks for any help.
    Tags: None
    #2
    Re: Dell 1900FP Monitor - BN44-00041A Inverter

    Originally posted by foxden
    First off, thanks to all posters who have provided me with an incredible source of information.

    I have the above monitor, unable to find with searching, which I understand is made by Samsung. Having been successful in repairing another Dell 172FBP (new transistors) I decided to try my hand at this one. Very similar problem, no visible screen just a flashing amber power light and a quick flash of light.

    This monitor has an external DC power supply. I took apart the monitor expecting a bad inverter board. It only has one electrolytic capacitor on it, 470uf, I believe and it looks ok, at least not leaking or bulging. I don't have an ESR meter or any real test equipment. The inverter board is almost all surface mount soldering other than this cap. The inverter board is BN44-00041A


    Any suggestions as to what might be the common fault with this monitor or inverter board.

    Thanks for any help.

    Well, for starters, the guy holding the screwdriver.

    Electronics repair is a logical process. Look at the symptoms, analyze what could be causing those symptoms, test to see if you are right, fix the failing component.

    Without some very basic information, you expect us to tell you how to fix it? I've got some basic truths for you. Perhaps you should sit down, this is going to be harsh.

    There is no Santa Claus. The Easter Bunny isn't real either. And even the greatest mine here (TopCat) needs a few clues before he can make a diagnosis. The rest of us need even more information.

    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

      #3
      Re: Dell 1900FP Monitor - BN44-00041A Inverter

      Hey, I am sorry. I didn't expect my first post to elicit such a harsh response. I was merely hoping to find out more about this particular monitor and its common failures if any. I guess from my previous problem with the dell I had read so much about its transistors failing that I honed in on the issue quickly.

      I had hoped to find some bulging capacitor or leaking one. I guess that would be too obvious.

      I have a lot more learning to do, as you pointed out.

      Sorry if I offended you because I have a great deal of respect for the knowledge you have.

      I am not a technician, but really hate that our society has become such a throw away one. I like to fix things if I can and am willing to read and experiment more.

      Thanks for the wake up.

      Comment

        #4
        Re: Dell 1900FP Monitor - BN44-00041A Inverter

        Assuming the inverter is the same as this one here

        http://lcdparts.net/InverterDetail3D...ProductID=2233

        what are the two ICs (part number) by the connector and flanked by the two diodes?

        If you have DMM or can borrow one, you can test the 4 transistors (what part number are these) next to the inductors as well for shorts.

        Have you tried switching the CCFL connections around or remove one at a time to see if one connector is bad?

        Post a clear picture after reading the FAQ on posting pictures.

        Originally posted by foxden
        Very similar problem, no visible screen just a flashing amber power light and a quick flash of light.

        It only has one electrolytic capacitor on it, 470uf, I believe and it looks ok, at least not leaking or bulging. I don't have an ESR meter or any real test equipment.
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          #5
          Re: Dell 1900FP Monitor - BN44-00041A Inverter

          Thanks Retiredcaps,

          I already reassembled everything but will likely open it again. The part isn't exactly what you linked to. I am attaching a picture from a vendor's site. I think the transistors are good, tested to see if they were shorted out. I am not sure about disconnecting the ccfls. Do you mean try it with one unplugged?
          Attached Files

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            #6
            Re: Dell 1900FP Monitor - BN44-00041A Inverter

            A picture from your actual monitor will help because it might show things that people can spot.

            Yes, try with one CCFL unplugged and see if one of the them is the culprit.

            You *think* the transistors are good? How did you test them? What reading did you get?

            Originally posted by foxden
            Thanks Retiredcaps,

            I already reassembled everything but will likely open it again. The part isn't exactly what you linked to. I am attaching a picture from a vendor's site. I think the transistors are good, tested to see if they were shorted out. I am not sure about disconnecting the ccfls. Do you mean try it with one unplugged?
            --- begin sig file ---

            If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

            We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

            Please do not post inline and offsite as they slow down the loading of pages.

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            Comment

              #7
              Re: Dell 1900FP Monitor - BN44-00041A Inverter

              You mentioned a flashing amber LED. This is often a monitor trying to tell you something is wrong. Or it might be a normal 'No Signal' thing. Hook up a video source; if the amber light continues to flash, suspect the power supply or a corrupted user EEPROM.

              One picture is worth a thousand words.

              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

                #8
                Re: Dell 1900FP Monitor - BN44-00041A Inverter

                Originally posted by foxden
                This monitor has an external DC power supply.
                I hope you had tested the external adaptor!

                Also, you need to monitor the voltage coming out of the adaptor to see if the "flash" corresponds to a voltage drop. Your problem might be as simple as a defective external dc source.

                Comment

                  #9
                  Re: Dell 1900FP Monitor - BN44-00041A Inverter

                  Good point, I have 2 monitors that use external adapters. One had a bad cap.

                  The other works fine, but I only knew that after trying another external adapter to rule it out.

                  It looks like a few of these 2002 heritage LCD monitors made use of external adapters. I suspect the trend to put them inside the monitors was a cost saving move and to make it easier for users (so they don't lose the adapter or they don't plug in the wrong one).

                  Originally posted by lucky13
                  I hope you had tested the external adaptor!

                  Also, you need to monitor the voltage coming out of the adaptor to see if the "flash" corresponds to a voltage drop. Your problem might be as simple as a defective external dc source.
                  --- begin sig file ---

                  If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

                  We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

                  Please do not post inline and offsite as they slow down the loading of pages.

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                    #10
                    Re: Dell 1900FP Monitor - BN44-00041A Inverter

                    Thanks for the advice, I will keep checking.

                    Comment

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