Dell 1504FP Monitor Year of Manufacture 2002

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  • matthmal
    Badcaps Veteran
    • Nov 2012
    • 306
    • Malta

    #41
    Re: Dell 1504FP Monitor Year of Manufacture 2002

    will do and let you know.

    May I ask you what that glue is?

    Comment

    • selldoor
      Slow Learner
      • Dec 2010
      • 7870

      #42
      Re: Dell 1504FP Monitor Year of Manufacture 2002

      https://www.badcaps.net/forum/showthread.php?t=13813

      The glue seems to be used for a number of reasons
      Hold components during wave soldering.
      Shield high voltage connections
      Cut down on vibration
      Support top heavy components
      Cause items to break down quicker than they would (What who said that)
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

      Comment

      • matthmal
        Badcaps Veteran
        • Nov 2012
        • 306
        • Malta

        #43
        Re: Dell 1504FP Monitor Year of Manufacture 2002

        Ok, here are the readings after cleaning the FET.

        POWER OFF, 2000ohms:

        Pin 1 to Pin 2 -> 695
        Pin 1 to Pin 3 -> 1
        Pin 2 to Pin 3 -> 1

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870

          #44
          Re: Dell 1504FP Monitor Year of Manufacture 2002

          I take it that "1" is on the left hand side meaning off scale rather than 1 ohms.
          In which case the mosfet is ok - you can put it back in and retest voltages
          at the connector. use 20vdc - then try again with the main board to panel cable (LVDS)unplugged.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

          • matthmal
            Badcaps Veteran
            • Nov 2012
            • 306
            • Malta

            #45
            Re: Dell 1504FP Monitor Year of Manufacture 2002

            yes that is what it means. i will retest the connectors and let you know.

            Comment

            • matthmal
              Badcaps Veteran
              • Nov 2012
              • 306
              • Malta

              #46
              Re: Dell 1504FP Monitor Year of Manufacture 2002

              POWER ON, VDC20:

              Pin 1 -> 0.50
              Pin 2 -> 0.57
              Pin 3 -> 0.65
              Pin 4 -> 0.31
              Pin 5 -> 0.92
              Pin 6 -> 0.31
              Pin 7 -> 0.63

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #47
                Re: Dell 1504FP Monitor Year of Manufacture 2002

                And with cn401 unplugged? Is there any marking on the board to suggest what the pins should be.
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • matthmal
                  Badcaps Veteran
                  • Nov 2012
                  • 306
                  • Malta

                  #48
                  Re: Dell 1504FP Monitor Year of Manufacture 2002

                  Everything is in its exact place. Do you suggest to remove the mosfet and re-try?

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #49
                    Re: Dell 1504FP Monitor Year of Manufacture 2002

                    No - just take the lvds lead from the main board to the panel out I think its cn401. then switch it on maybe the backlights will come on but no picture, then take the 7 voltages again. - Did you try the hairdryer?
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • matthmal
                      Badcaps Veteran
                      • Nov 2012
                      • 306
                      • Malta

                      #50
                      Re: Dell 1504FP Monitor Year of Manufacture 2002

                      I haven't tried the hair dryer yet, let me try it.

                      Do you mean C101 or C401?

                      I noticed something now when removing the leads and leaving the power board by its own. I tested all the voltages and they came all with 0.0 and something but after a few minutes the voltages started to change. They go up very slowly to these and if I left them for another 5 mins they could have gone more up.

                      POWER ON, VDC20:

                      Pin 1 -> 4.01
                      Pin 2 -> 0.05
                      Pin 3 -> 0.7
                      Pin 4 -> 1.6
                      Pin 5 -> 5.7
                      Pin 6 -> 3.4
                      Pin 7 -> 4.4

                      Please note that I can't light up the bulbs without the vga board connected as this board by has the invertor board connected to it. i.e. the board that lights up the bulbs

                      Comment

                      • selldoor
                        Slow Learner
                        • Dec 2010
                        • 7870

                        #51
                        Re: Dell 1504FP Monitor Year of Manufacture 2002

                        Ok - you are not listening/reading/doing?
                        In your first picture right at the bottom of the main board there is a connector socket
                        CN401 - I wanted you to try it with the power supply the main board and the inverter board connected but the cable at CN 401 disconnected.

                        As you apply voltage to the boards the caps heat up. As the cap get warm the ESR
                        drops and they start to work a bit better. I have suggested twice I think that you heat the caps with a hairdryer but you have not said you have done that?
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment

                        • matthmal
                          Badcaps Veteran
                          • Nov 2012
                          • 306
                          • Malta

                          #52
                          Re: Dell 1504FP Monitor Year of Manufacture 2002

                          I am reading but apparently I did not understand. I got you now.

                          My apologies......

                          I will try exactly what you told me and I will post all the results. Sorry again.

                          Comment

                          • selldoor
                            Slow Learner
                            • Dec 2010
                            • 7870

                            #53
                            Re: Dell 1504FP Monitor Year of Manufacture 2002

                            Ok - no rush - Im off to bed - early start tomorrow.
                            Please upload pictures using attachment function when ask for help on the repair
                            http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

                            • matthmal
                              Badcaps Veteran
                              • Nov 2012
                              • 306
                              • Malta

                              #54
                              Re: Dell 1504FP Monitor Year of Manufacture 2002

                              I have done the hair dryer thing and before I started the test a big spark occurred.

                              POWER ON VDC20:
                              Pin 1 -> 6.89
                              Pin 2 -> 5.5
                              Pin 3 -> 4.02
                              Pin 4 -> 3.7
                              Pin 5 -> 2.5
                              Pin 6 -> 2.04
                              Pin 7 -> 1.8

                              Please note that the voltages started to go down.

                              Comment

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #55
                                Re: Dell 1504FP Monitor Year of Manufacture 2002

                                Big Spark?? where from? could be a bad solder joint - can you do a good picture of the area. I think just get some new caps in.
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                • matthmal
                                  Badcaps Veteran
                                  • Nov 2012
                                  • 306
                                  • Malta

                                  #56
                                  Re: Dell 1504FP Monitor Year of Manufacture 2002

                                  yes it was a big spark and it did hit me hehe. I marked an estimation from where the spark came.
                                  Attached Files

                                  Comment

                                  • selldoor
                                    Slow Learner
                                    • Dec 2010
                                    • 7870

                                    #57
                                    Re: Dell 1504FP Monitor Year of Manufacture 2002

                                    Is that pic after the spark - I see the board is balanced on top of the metal frame I hope you dont run tests with it like that.

                                    Did the board work (as well as it ever did) after the spark?
                                    The mains lead plugs in in that area - maybe the plug was just loose?
                                    Last edited by selldoor; 12-11-2012, 06:37 AM.
                                    Please upload pictures using attachment function when ask for help on the repair
                                    http://www.badcaps.net/forum/showthread.php?t=39740

                                    Comment

                                    • matthmal
                                      Badcaps Veteran
                                      • Nov 2012
                                      • 306
                                      • Malta

                                      #58
                                      Re: Dell 1504FP Monitor Year of Manufacture 2002

                                      i have now replaced all those caps and the voltages are even worse, they are ranging from 0.03 to 0.01 :S

                                      Comment

                                      • selldoor
                                        Slow Learner
                                        • Dec 2010
                                        • 7870

                                        #59
                                        Re: Dell 1504FP Monitor Year of Manufacture 2002

                                        Great !!

                                        Start again - perhaps something got overheated with the hairdrier and burnt out.
                                        First check that you got all the caps in the right place and the right way around.
                                        Pale stripe (negative )on the black semicircle side. You can see which caps went where for most of them at least from the pics in the thread.

                                        Working just on the power supply power off test the two black barrel fuses.
                                        If they are ok then plug the board in and switch on. Meter on vDC600 test the BIG cap
                                        CAREFULLY - High voltage. Test for a few seconds to see if it remains stable.
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

                                        • matthmal
                                          Badcaps Veteran
                                          • Nov 2012
                                          • 306
                                          • Malta

                                          #60
                                          Re: Dell 1504FP Monitor Year of Manufacture 2002

                                          will do and let you know

                                          Comment

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