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Dell 2407WFPb Monitor - Bad Cap

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    Re: Dell 2407WFPb Monitor - Bad Cap

    I too thought that primary caps never failed until I opened up a 24 port gigabit switch to find a slightly bulging 100uf 400V Taicon cap

    Comment


      Re: Dell 2407WFPb Monitor - Bad Cap

      Originally posted by Pentium4 View Post
      I too thought that primary caps never failed until I opened up a 24 port gigabit switch to find a slightly bulging 100uf 400V Taicon cap
      Big caps, rarely, but not never fail. Sometimes the big cap looks bulged, but is not. If you press down on the big cap, is it flat?
      --- 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


        Re: Dell 2407WFPb Monitor - Bad Cap

        Originally posted by micdis View Post
        Ok, you should all really stop discussing solutions! The solution to repair the powerboard has passed this topic a few times now:

        Buy these parts (farnell number = first number):
        1469418 VISHAY SEMICONDUCTOR TZMC15-GS08 DIODE, ZENER, 15V, 0.5W
        1828683 PANASONIC CAPACITOR, SNAP-IN, 450V, 120UF
        2*1903859 MULTICOMP RESISTOR, WIREWOUND, 0R47, 5%,
        1652430 SEMICONDUCTOR NCP1200D100R2G
        9882464 STMICROELECTRONICS
        9935517 STMICROELECTRONICS STP10NK60ZFP MOSFET, N, TO-220FP
        1354592 LITTELFUSE 0234004.MXP FUSE, MEDIUM DELAY, 4A
        1162740 SCHURTER 0031.8201 FUSE HOLDER, PCB,
        9693904 ECA2AM010 CAPACITOR, 1UF, 100V (optional to replace)
        & 1k resistor in 0805 size or 1206


        And replace:
        -C605 120uF/450V
        -Q651 STP10NK60ZFP
        -IC651 L6561D
        -R669 1k 1206
        -ZD601 15V 0.5W (diode)
        -IC601 NCP1200D
        -R670 = 2*0.47ohm together parallel (makes 0.23ohm)

        This will definitely solve most of the problems! Pictures with the pieces that should be replaced are attached. These are images of a repaired working board.

        Fixed 2 Dell 2407WFPb screens with the replacement of these parts.
        I just signed up for the forums to say thank you for this post. Using your hi-res pictures and parts list, I ordered my replacement parts from Digi-key and successfully repaired my Dell 2407 tonight and I am typing on it right now.

        You saved me a lot of money. Well done.

        Comment


          Re: Dell 2407WFPb Monitor - Bad Cap

          I just want to say a big thankyou to everyone in this forum for their dedication and support. With your help and the parts list assembled by micdis, I was able to buy all parts from Farnell for £15 inc postage, and got a 2407WFPb monitor working!

          From my experience, I had a few little troubles.
          1) the 1828683 PANASONIC CAPACITOR, SNAP-IN, 450V, 120UF part sent by Farnell was a short stubby model, not quite the same as the original removed part. It did not have any legs and so I had to improvise some legs from some resistors that I had.
          Would any one know if the resistor legs from the wirewound resistor mentioned in the parts list by micdis is enough gauge to carry the voltage required by the 450v 120uf cap? It seems to work so far, but am a little concerned about running the monitor for a long time because of this.
          2) On removing the NCP1200, I managed to lift some tracks (pins 7,and 6!). Having downloaded the schematics for this part, I worked out that pin 7 was not connected anyway. Pin 6 was the Vcc, so I traced the track underneath the part that led to a resistor to the side of the part, and it also connected to a cap on the other side of the board.
          3) I could not read my label on the 6561 component. Looking at the pictures on this forum, I couldnt make out which way the chip was supposed to be fitted. Again, schematics helped me out again to work out correct orientation for this part.
          I also examined all other components and they all seemed to be orientated the same way, so this gave me a lot of confidence that I had it the right way around.

          So once again, many thanks to everyone for their support.
          Regards
          Jason

          Comment


            Re: Dell 2407WFPb Monitor - Bad Cap

            Bootlegger17-Congrats on a successful repair. It's refreshing to see someone actually look at the data sheets and use them to aid in the repair of their monitor.

            The resistor wire you used should at least be the same thickness as the 1 Watt resistors that are on the board now. Or better yet, compare the thickness to the wire of the original cap you replaced.

            Comment


              Re: Dell 2407WFPb Monitor - Bad Cap

              Hi JetAdm
              The size is just slightly smaller, but also, the legs are a lot more flexible and bendable than the original also cap. I will keep an eye out for 'something' better quality and replace it in due course, but at the moment it seems to be holding up ok

              Comment


                Re: Dell 2407WFPb Monitor - Bad Cap

                Originally posted by micdis View Post
                Ok, you should all really stop discussing solutions! The solution to repair the powerboard has passed this topic a few times now:

                Buy these parts (farnell number = first number):
                1469418 VISHAY SEMICONDUCTOR TZMC15-GS08 DIODE, ZENER, 15V, 0.5W
                1828683 PANASONIC CAPACITOR, SNAP-IN, 450V, 120UF
                2*1903859 MULTICOMP RESISTOR, WIREWOUND, 0R47, 5%,
                1652430 SEMICONDUCTOR NCP1200D100R2G
                9882464 STMICROELECTRONICS
                9935517 STMICROELECTRONICS STP10NK60ZFP MOSFET, N, TO-220FP
                1354592 LITTELFUSE 0234004.MXP FUSE, MEDIUM DELAY, 4A
                1162740 SCHURTER 0031.8201 FUSE HOLDER, PCB,
                9693904 ECA2AM010 CAPACITOR, 1UF, 100V (optional to replace)
                & 1k resistor in 0805 size or 1206


                And replace:
                -C605 120uF/450V
                -Q651 STP10NK60ZFP
                -IC651 L6561D
                -R669 1k 1206
                -ZD601 15V 0.5W (diode)
                -IC601 NCP1200D
                -R670 = 2*0.47ohm together parallel (makes 0.23ohm)
                Thanks for the list, on my PCB all the mentioned parts are blown plus these:

                R674
                Q654

                Earlier in this thread it was mentioned that R674 could probably be read as "8251". Would be nice if anybody can confirm this to 100% before I place my order

                Comment


                  Re: Dell 2407WFPb Monitor - Bad Cap

                  Yep, most of them are usually blown, mine had some other parts blown too (post #254) like Q654 and the diode you mention was ok (ZD601 15V 0.5W)

                  Basically everyone should check ALL the different parts mentioned on this thread.

                  Oh BTW, I'm using a 120uF/400V Nichicon capacitor, didn't find anywhere a 120uF/450v.

                  Almost two months !

                  Originally posted by micdis View Post
                  Ok, you should all really stop discussing solutions! The solution to repair the powerboard has passed this topic a few times now:

                  Buy these parts (farnell number = first number):
                  1469418 VISHAY SEMICONDUCTOR TZMC15-GS08 DIODE, ZENER, 15V, 0.5W
                  1828683 PANASONIC CAPACITOR, SNAP-IN, 450V, 120UF
                  2*1903859 MULTICOMP RESISTOR, WIREWOUND, 0R47, 5%,
                  1652430 SEMICONDUCTOR NCP1200D100R2G
                  9882464 STMICROELECTRONICS
                  9935517 STMICROELECTRONICS STP10NK60ZFP MOSFET, N, TO-220FP
                  1354592 LITTELFUSE 0234004.MXP FUSE, MEDIUM DELAY, 4A
                  1162740 SCHURTER 0031.8201 FUSE HOLDER, PCB,
                  9693904 ECA2AM010 CAPACITOR, 1UF, 100V (optional to replace)
                  & 1k resistor in 0805 size or 1206


                  And replace:
                  -C605 120uF/450V
                  -Q651 STP10NK60ZFP
                  -IC651 L6561D
                  -R669 1k 1206
                  -ZD601 15V 0.5W (diode)
                  -IC601 NCP1200D
                  -R670 = 2*0.47ohm together parallel (makes 0.23ohm)

                  This will definitely solve most of the problems! Pictures with the pieces that should be replaced are attached. These are images of a repaired working board.

                  Fixed 2 Dell 2407WFPb screens with the replacement of these parts.

                  Comment


                    Re: Dell 2407WFPb Monitor - Bad Cap

                    Another SUCCESS here!
                    I replaced all the parts listed two posts above and the unit is working.
                    Beside that I highly recommend to change the five output caps and the three caps on the inverter, like some people here already suggested. They are also Elite brand.

                    PS: R674 is marked "8251", now I can confirm.
                    Last edited by sebr; 09-30-2012, 08:54 AM.

                    Comment


                      Re: Dell 2407WFPb Monitor - Bad Cap

                      I have an inverter problem as detailed here:

                      https://www.badcaps.net/forum/showthread.php?t=22549

                      I was wondering are these five output caps you refer to the tiny SMD ones on the intverter? If so which are you talking about exactly. Also do you know what I need to buy to replace them. I have already changed the three big ones on the inverter to no avail.

                      Thanks

                      Comment


                        Re: Dell 2407WFPb Monitor - Bad Cap

                        @leapius, did you do any resistance reading on the inverter transformer yet? Do you have about 19vdc at the inverter fuse?
                        https://www.badcaps.net/forum/showth...fpb#post245054
                        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


                          Re: Dell 2407WFPb Monitor - Bad Cap

                          I'm talking about C711-C715 on the PSU board. I replaced them with Panasonic FC/FM caps just as I did with those three from the inverter. If after that your CCFL don't come up fully, I would suggest looking for cold soldering joints (inverter).

                          Comment


                            Re: Dell 2407WFPb Monitor - Bad Cap

                            Originally posted by budm View Post
                            @leapius, did you do any resistance reading on the inverter transformer yet? Do you have about 19vdc at the inverter fuse?
                            https://www.badcaps.net/forum/showth...fpb#post245054
                            I checked the standby voltage from F1 to GND and it is a solid 19v as per this photo: https://www.badcaps.net/forum/attach...2&d=1339721233

                            I (think) I checked the resistance of the secondary windings of each inverter and they are all around the 960-990ohm range. I was told by someone else that the problem could lie in the small surface mounted capacitors but I am lost to know which it could be or what I would replace them with. There are loads of those.

                            Comment


                              Re: Dell 2407WFPb Monitor - Bad Cap

                              Originally posted by sebr View Post
                              Another SUCCESS here!
                              I replaced all the parts listed two posts above and the unit is working.
                              Beside that I highly recommend to change the five output caps and the three caps on the inverter, like some people here already suggested. They are also Elite brand.

                              PS: R674 is marked "8251", now I can confirm.
                              I have a monitor with ic 651 blown actually cracked. Also R 674 is blackened and in addition R 678 is beyond readint the value. Do you know it's value? thanks zener diode

                              Comment


                                Re: Dell 2407WFPb Monitor - Bad Cap

                                Originally posted by zenerdiode View Post
                                I have a monitor with ic 651 blown actually cracked. Also R 674 is blackened and in addition R 678 is beyond readint the value. Do you know it's value? thanks zener diode
                                Id say few of us have this set open most will never see one.
                                Try cleaning the components with isopropyl alcohol. Have you searched through the threads / online for pictures that might show them.
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment


                                  Re: Dell 2407WFPb Monitor - Bad Cap

                                  Here you go: https://www.badcaps.net/forum/attach...4&d=1316486210

                                  Comment


                                    Re: Dell 2407WFPb Monitor - Bad Cap

                                    Here:
                                    R674 = 8251 = 8250 Ohms (I measured it to verify)
                                    R678 = 103 = 10K Ohms

                                    More pictures here:
                                    http://s807.photobucket.com/albums/y...ll%202407WFPB/

                                    More power supply board:
                                    http://s807.photobucket.com/albums/y...upply%20board/
                                    Attached Files
                                    Last edited by budm; 12-06-2012, 12:56 AM.
                                    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


                                      Re: Dell 2407WFPb Monitor - Bad Cap

                                      Hi,

                                      Complete newbie here. I just moved from Atlanta, GA to Albany, NY and when I unpacked my 2407 WFPb, plugged it in and tried to power it on, the power button lit up and then went blank immediately. No sound, no smoke that I noticed. After a fair bit of traveling in December, I'm ready to come back home and take care of this. I have skimmed through this thread and spent a little time researching the net for this problem, and while some people have some success, it seems like it is far from a trivial fix. I would like your opinion on my options:
                                      - try to fix this myself. I might have a soldiering iron lying around somewhere but I don't have much else and I have very little experience fixing electronics. And my previous experience with manual electronic labor has been poor (not really the crafty kind): for example, when I opened my MacBookPro to replace the optical drive with a SSD, I was successful but managed to hose one of my speaker cable.
                                      - bring my monitor to a professional and have it fixed for less than a price of a shitty replacement monitor (say $100-$150). I am new to my area so I'm not sure what kind of service I can get easily... Looking at the price of 1920x1200 monitors, I think it might still be a decent deal for me. In an ideal world, I was planning on upgrading that monitor at the end of 2013 but currently funds are too low for the equivalent top of the line Dell (2711 I believe)
                                      - in the event I decide to buy a new monitor, what should I do with the current one? Seems like a waste to recycle it if most of the components are good. How would I go to find it a new home?

                                      Hopefully my questions are somewhat in line with the forum, thanks in advance for your help.

                                      Comment


                                        Re: Dell 2407WFPb Monitor - Bad Cap

                                        I would say have a look -do a few tests if it is too much then you can rethink what to do.
                                        You will need a multimeter to do basic tests - a 5$ one will do.
                                        If you are really lucky getting the back off may be the hardest part. Oh and taking good photos of it

                                        Welcome to the forum-
                                        We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back (in the same orientation) and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

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

                                        Examples of what is needed

                                        https://www.badcaps.net/forum/attach...7&d=1280167246

                                        https://www.badcaps.net/forum/attach...6&d=1280167246

                                        https://www.badcaps.net/forum/attach...4&d=1280167246
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment


                                          Re: Dell 2407WFPb Monitor - Bad Cap

                                          Thanks a lot for the pointers, I will get these pictures as soon as I'm back in Albany.

                                          Comment

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