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Dell E177FPb - White Screen

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    #21
    Re: Dell E177FPb - White Screen

    And be real careful if you are going to put the old caps back in place (check for short after install each cap back in place before installing the next one), they can easily be damaged during removal and re-installation. You may want to look for fine cracks on the body of the cap also.
    Attached Files
    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


      #22
      Re: Dell E177FPb - White Screen

      Thanks for the advice. It is really 1 ohm on the DMM set to measure resistance. Strange thing is that it starts off shorted and builds up to 1 ohm, which might suggest that a "shorted" cap is getting charged but pretty poorly. I was checking all the caps and as you said, a whole lot of them are showing as shorted, no doubt because they are all in parallel.

      I'll go through these steps and report back what I find. Thanks again!

      Comment


        #23
        Re: Dell E177FPb - White Screen

        Quick update: Found the shorted ceramic cap (C24) some time back, but I don't have any replacements. Trying to get some so I can replace cap and the fuse on the board and try it. The wait is killing me :-(

        Comment


          #24
          Re: Dell E177FPb - White Screen

          Was it the last one you removed? Can you read the value of the good one ?
          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


            #25
            Re: Dell E177FPb - White Screen

            Originally posted by vela View Post
            Found the shorted ceramic cap (C24) some time back, but I don't have any replacements. Trying to get some so I can replace cap and the fuse on the board and try it.
            I didn't even bother to try with a ceramic. See here

            https://www.badcaps.net/forum/showpo...1&postcount=23

            I didn't take pictures on purpose due to my terrible solder job. 3 months of daily use and it still works.
            Last edited by retiredcaps; 06-27-2012, 06:37 PM.
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            Comment


              #26
              Re: Dell E177FPb - White Screen

              22uF 25V sounds about right, juts make sure to install it with correct polarity by checking the voltage on other caps that are in parallel with this bad cap, the MLCC does not have polarity.
              Last edited by budm; 06-27-2012, 06:38 PM.
              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


                #27
                Re: Dell E177FPb - White Screen

                Originally posted by budm View Post
                22uF 25V sounds about right, juts make sure to install it with correct polarity by checking the voltage on other caps that are in parallel with this bad cap, the MLCC does not have polarity.
                This is the cap I used.

                https://www.badcaps.net/store/produc...roducts_id=102

                Yes, I checked with a multimeter to see which side was ground.

                BTW, my guess as to uF was based on measuring other ceramic caps on the logic board of the same size with my multimeter set on capacitance measurement mode.
                --- 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


                  #28
                  Re: Dell E177FPb - White Screen

                  Cool idea using an electrolytic cap. Should have checked in here first before scrounging around and pulling a similarly sized ceramic cap off an old ethernet card and plugging it in because I saw that approach suggested in some other thread here when I was browsing some time back. I guess there is no telling if the substitute is rated for 25V or not. Unfortunately, I don't have a way to measure capacitance, so getting another similar one off the board is not going to help.
                  Still stuck on the fuse, though. Trying to decide if I should order replacements or go the TOM66 route and short it

                  Comment


                    #29
                    Re: Dell E177FPb - White Screen

                    Originally posted by vela View Post
                    Cool idea using an electrolytic cap. Should have checked in here first before scrounging around and pulling a similarly sized ceramic cap off an old ethernet card and plugging it in because I saw that approach suggested in some other thread here when I was browsing some time back.
                    That was probably me. I've been using that method for a while now, both for LCD monitor T-con boards and other electronics too. Never had a problem with it. Oldest t-con repairs I have are (2 monitors: 19" Samsung SyncM. 931B and 19" HP W19b) about 2.5 years old now and as far as I know, both monitors still work fine.

                    SMD ceramic caps are usually rated for 32V and above, so most likely you won't have a problem.

                    Originally posted by vela View Post
                    Trying to decide if I should order replacements or go the TOM66 route and short it
                    Ok, but if you do and something else smokes, I ain't going to help .

                    Fuses are there for a reason. If you really don't want to get the exact SMD fuse replacement, then at least jurry-rig a standard fuse with some wires and hook that up to the t-con.

                    If there's no fuse on the t-con or it's over rated and there is a fault on the t-con, more than likely something else will blow too. I've seen that happen on a 17" Dell (the fuse was too beefy apparently) - I ended up spending another 2 hours looking for the problem. Finally found a completely burned transistor on the video/logic board. Had to do some jurry-rigging on that monitor to get it working.
                    Save yourself the trouble and put a fuse of some sort in there.

                    Comment


                      #30
                      Re: Dell E177FPb - White Screen

                      Originally posted by momaka View Post
                      That was probably me.
                      Correct.

                      Fuses are there for a reason.


                      Otherwise, the cost cutters would have removed it.
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                      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


                        #31
                        Re: Dell E177FPb - White Screen

                        You do not even have to remove the old blown fuse, you just lay the new one right on top and solder both ends to the old fuse.
                        YOU CAN GET 22UF 25V Ceramic SMD from MOUSER, for example:
                        http://www.mouser.com/Passive-Compon...ERAMIC&FS=True
                        Last edited by budm; 06-29-2012, 08:56 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


                          #32
                          Re: Dell E177FPb - White Screen

                          Totally understand about the fuses. I am awaiting the parts and will report back when installed. The catch with this particular T-con is that the populated side of the board flips down against the back of the lcd panel. So there is not much space to insert any larger scale components and still fold down the board and reassemble. The fuse in particular is just below the connector to the other board and really leaves no wiggle room.

                          Parts should be here in a couple of days...

                          Comment


                            #33
                            Re: Dell E177FPb - White Screen

                            Folks, I am delighted to report that with the scounged up ceramic caps and a new SMD fuse (3A) on the T-CON board, the monitor is back up and running. Thanks for all your help! I think I am hooked and am actively looking for "broken" monitors to fix :-) .

                            Comment


                              #34
                              Re: Dell E177FPb - White Screen

                              Great job!
                              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


                                #35
                                Re: Dell E177FPb - White Screen

                                Congrats!
                                Now when you find a "white screen", you know what to check . Can (and usually is) an easy fix if there's just a shorted ceramic cap. I like it even better than bad caps fixes because I have so many junk boards I can pull ceramic caps off of that I'll probably never run out.

                                Comment

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