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    #521
    Re: Dell E172fpb

    Originally posted by veeone View Post
    a very slight timp noise coming from the board
    If you mean "tick" noise, check the DC voltage across the startup cap. It can go bad without bloating.
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    Comment

      #522
      Re: Dell E172fpb

      As i'm new to electronics which is the startup cap?

      http://s1063.photobucket.com/albums/...rent=DV172.jpg

      Comment

        #523
        Re: Dell E172fpb

        Did you recheck those transistors again to see if they are shorted out again and the tabs are not touching the chassis?
        You can also remove the BEL FUSE which feed the B+ to the inverter circuits and see if the LED stays green with PC connected. Also check the value and leakage resistance of those 4 tuning caps by the 4 inverter transistors.
        Last edited by budm; 09-05-2012, 11:31 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

          #524
          Re: Dell E172fpb

          Originally posted by veeone View Post
          As i'm new to electronics which is the startup cap?

          http://s1063.photobucket.com/albums/...rent=DV172.jpg
          Post your images following my sig file exactly.
          --- 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

            #525
            Re: Dell E172fpb

            Ok did i get i correct? Vee
            Attached Files

            Comment

              #526
              Re: Dell E172fpb

              This Cap seems to be the probable issue so will get some in town tomorrow and replace it and others and see if i get a result.
              Sorry macro on my camera is not that good but the large brown 35v 1000uf is the bulging one.
              Missed it before when i replaced at the mofsets etc. Vee
              Attached Files

              Comment

                #527
                Re: Dell E172fpb

                Replaced the large brown 35v 1000uf with units about 50% larger in size (just squeezed in) and the rest of the caps for the board are on order.
                Fired it up anyway as will be a several days for stock to come in and it is working well. Yay
                Will replace the others so i know i have all good quality caps and the board has been totally resoldered all over so hopefully no more problems. Thanks for all advice everyone and tutorials retiredcaps . Vee

                Comment

                  #528
                  Re: Dell E172fpb

                  How do i identify this part as it is now making a squealing noise and not all the time. It is T601 on the power board number on the sticker is 19.20267.001
                  Photo attached.
                  Cheers
                  Attached Files

                  Comment

                    #529
                    Re: Dell E172fpb

                    That squealing noise may be due to bad main DC filter cap (that large black cap in the primary side). Put the meter in AC mode and take the voltage reading on the two legs of the cap, also take the DC reading as well.
                    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

                      #530
                      Re: Dell E172fpb

                      With this monitor its pretty hard to do as you cannot get to the otherside of the board but will give it a try. Must be a workaround.
                      Also noise is definatley emanating from the transformer i rolled up a sheet of paper and put the tube over it and you can hear the noise easy and nothing when i do the same to the large cap. Cheers Vee

                      Comment

                        #531
                        Re: Dell E172fpb

                        You can solder two wires to the leg of the cap and run them out to allow you to connect the probes to them, you MUST BE REAL CAREFUL! you are working in the LINE (HOT side) of the circuits. Do not touch any thing with your hands.
                        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

                          #532
                          Re: Dell E172fpb

                          Ok thanks will try that later and get back to you. Cheers Vee

                          Comment

                            #533
                            Re: Dell E172fpb

                            Well soldered on some extensions to the cap. We are 240v system in Australia

                            Its an Elite brand Cap 450WV 100MFD pc(m) 105c

                            Readings 331v DC
                            730v AC

                            Comment

                              #534
                              Re: Dell E172fpb

                              730V AC !!!!!!! measure again I suggest....

                              Comment

                                #535
                                Re: Dell E172fpb

                                I tested each 3-4 times with same results as i wanted to be sure i got it correct.
                                Why would it say that?

                                Comment

                                  #536
                                  Re: Dell E172fpb

                                  Well obviously something is amiss,BUT trying to identify what,is not going to be easy.The DC input seems correct to give you the correct DC voltage on the cap.The first thing to do, although it may seem odd,is to measure the AC in the wall socket...we know its going to be about your 240v mains AC,BUT what does the meter actally read,on the AC range you used to measure on the Cap ??/

                                  Comment

                                    #537
                                    Re: Dell E172fpb

                                    Meter reads at the socket fluctuates between 241-245v ac. I might just get a new cap and see if i get different readings would that be a good idea? Cheers Vee

                                    Comment

                                      #538
                                      Re: Dell E172fpb

                                      Originally posted by veeone View Post
                                      Meter reads at the socket fluctuates between 241-245v ac. I might just get a new cap and see if i get different readings would that be a good idea? Cheers Vee
                                      Must be worh a try.keep the Forum informed please, as this is odd !!

                                      Comment

                                        #539
                                        Re: Dell E172fpb

                                        Originally posted by veeone View Post
                                        How do i identify this part as it is now making a squealing noise and not all the time. It is T601 on the power board number on the sticker is 19.20267.001
                                        Photo attached.
                                        Cheers
                                        Monitor has been plodding on for months and have been waiting for something to give up but not the case. Just squeals like a pig once it starts to get warm so good for about 20min and then it starts it call!!
                                        So today replaced the large black main cap in the photo the 450V 100mfd Elite branded with a japanese equivalent and did not make any difference.
                                        Now to locate a tranformer in the photo if i can as thats were the noise is coming from for sure!! Anyone have any idea where i may get one?? Cheers Vee

                                        Comment

                                          #540
                                          Re: Dell E172fpb

                                          I just got one of these. Unlike most of you fellows, mine is doing thr 1 second to black issue.

                                          If i shine a light at the screen, i can still see the image, and the green power led stays on solid so the monitor is staying on except for the backlight.

                                          Should i tear it down and check these common suspect transistors anyways?

                                          edit whoops this is a E173FPc maybe its not the same internally.
                                          Last edited by cadillacman; 03-18-2013, 06:31 PM.

                                          Comment

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