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Dell 2007FPb cannot stay on

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    #1

    Dell 2007FPb cannot stay on

    I picked up a Dell 2007 FPb from someone else. Its symptom is after power on (press the on/off button), the initial Dell logo animation just shows up for less than half second and then black screen. The power led stay green and with flashlight at 45 degree I can't see any image. After reading a few threads about this monitor, I guess it is somewhere on the inverter board but could find any obvious defect part. So I took pictures for all the four boards and try to see whether expert here can give me some suggestion. Thanks a lot.
    Attached Files
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    #2
    Re: Dell 2007FPb cannot stay on

    In the last picture there is a small yellow torpedo fuse - test it. Should be ok as you do get a flash. Next test the secondary windings on the 3 transformers on that same board.
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

      #3
      Re: Dell 2007FPb cannot stay on

      Sorry. I was away for a week from my office. I test the resistence of the yellow fuse by multimeter, seems to be OK. How to check the transformer? Should I put the four boards together and plug in? Thanks.

      Comment

        #4
        Re: Dell 2007FPb cannot stay on

        https://www.badcaps.net/forum/showth...fpb#post335335

        Check the inverter transformer secondary side resistance.
        If you search the '2007fpb', you will get lots of threads.
        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

          #5
          Re: Dell 2007FPb cannot stay on

          I did checking according to the post:
          https://www.badcaps.net/forum/showth...pb+transformer
          The resistence between 5 and 6 is out of my multimeter reading range for all the three transformers, between 7 and 8 is something around 9 Milliion om for all three of the them. When I hook up all the four boards together and plug in the the inverter connector in to A,B,C,D separately, I could not see the screen was lit up after turn on the power. How to see the "lamp flash briefly"?
          Thanks.
          Attached Files

          Comment

            #6
            Re: Dell 2007FPb cannot stay on

            Pin 8 and the bottom pin where the dot is that is one high voltage winding for the left side of the transformer, pin 5 and the bottom right pin is for another winding, it should be around 1000 Ohms.
            Same pin out as this one:
            http://s807.photobucket.com/user/bud...tml?sort=3&o=2
            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

              #7
              Re: Dell 2007FPb cannot stay on

              I checked the resistence, all six pairs are about 1060 ohms except the right most (ie the pair for the pin 5 as labelled) is 1389 ohms. Do you think this reading ok?
              Thanks.

              Comment

                #8
                Re: Dell 2007FPb cannot stay on

                Originally posted by gengtian View Post
                I checked the resistence, all six pairs are about 1060 ohms except the right most (ie the pair for the pin 5 as labelled) is 1389 ohms. Do you think this reading ok?
                No, it (1389 ohms) is bad. The readings should be within 3% of each other.
                Last edited by retiredcaps; 05-09-2013, 10:28 PM.
                --- 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.

                --- end sig file ---

                Comment

                  #9
                  Re: Dell 2007FPb cannot stay on

                  2nd that.
                  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

                    #10
                    Re: Dell 2007FPb cannot stay on

                    Thanks for both of you. What "keyword" shall I use to find a replacement on those website such as digikey.com or newark.com? The label on top of them is 1J.26061.001 4001R 613003

                    Comment

                      #11
                      Re: Dell 2007FPb cannot stay on

                      I don't see any replacement parts for a 4001R on ebay or http://lcdparts.net/T.aspx.
                      Last edited by retiredcaps; 05-09-2013, 11:59 PM.
                      --- 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.

                      --- end sig file ---

                      Comment

                        #12
                        Re: Dell 2007FPb cannot stay on

                        BTW, everything you have described and tested is in the FAQ "2 seconds to black" starting with post #19 (latest revision).

                        https://www.badcaps.net/forum/showthread.php?t=10419
                        --- 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.

                        --- end sig file ---

                        Comment

                          #13
                          Re: Dell 2007FPb cannot stay on

                          I forgot that an USA member might also have the 4001R transformer from a repair gone bad. If you are interested, I can send him an email to see if he still has one and put you two in contact?
                          Last edited by retiredcaps; 05-09-2013, 11:59 PM.
                          --- 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.

                          --- end sig file ---

                          Comment

                            #14
                            Re: Dell 2007FPb cannot stay on

                            Thank you very much for your generous offer and very nice helps. I found the inverter board sold on a Chinese ebay site and decided to jump into there. Thanks.

                            Comment

                              #15
                              Re: Dell 2007FPb cannot stay on

                              Just to update. I finally received the inverter board from the Chinese ebay store and now the monitor works. Thank all you guys very much for the helps.
                              One more thing, just found on ebay this inverter board is also available now for $20 from a US seller.

                              Comment

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