Dell 1704FPT

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  • Rtech
    Badcaps Legend
    • Jul 2010
    • 1095

    #21
    Re: Dell 1704FPT

    Suggest you try a local Maplins if possible.....trying to buy by post will not be economically viable.

    Comment

    • ralphup
      Member
      • Aug 2011
      • 38
      • UK

      #22
      Re: Dell 1704FPT

      Originally posted by Rtech
      Suggest you try a local Maplins if possible.....trying to buy by post will not be economically viable.
      thanks been search the NET all day, maplins dont do a 2MOhm so think its going to have to be 2 x 1 MOhm - unless you ca think of another option Rtech.

      Comment

      • ralphup
        Member
        • Aug 2011
        • 38
        • UK

        #23
        Re: Dell 1704FPT

        PS youre only up the road from me!

        Comment

        • Rtech
          Badcaps Legend
          • Jul 2010
          • 1095

          #24
          Re: Dell 1704FPT

          As you are in Leeds, then go to Farnells !! Obviously no postage as it would be an over the Counter purchase, and I don't think there is a minimum order when you collect.

          Comment

          • ralphup
            Member
            • Aug 2011
            • 38
            • UK

            #25
            Re: Dell 1704FPT

            Originally posted by Rtech
            As you are in Leeds, then go to Farnells !! Obviously no postage as it would be an over the Counter purchase, and I don't think there is a minimum order when you collect.
            Hi mate,

            got 2 x 1MOhm and fittedm but no joy still dies after a few secs.

            This is with a NEW screen asthe old one had a broken CCL. I know its the PTB-1511 board as I have a couple of these and substituted for a good one. Any ideas what else could have died?

            Thanks for all help!

            Comment

            • Rtech
              Badcaps Legend
              • Jul 2010
              • 1095

              #26
              Re: Dell 1704FPT

              I think some pictures of top and bottom may be helpful.Use the 'managed attachments' to put them on.

              Comment

              • Rtech
                Badcaps Legend
                • Jul 2010
                • 1095

                #27
                Re: Dell 1704FPT

                Have just checked the faulty board I have,and that has the same symptoms as your has,BUT the fault is an open secondary on the Inverter Transformer T101,and am still waiting to find one,they should read approx 450 ohms.Also my R125 and the similar one on the other transformer is 2.2Mohms.

                Comment

                • ralphup
                  Member
                  • Aug 2011
                  • 38
                  • UK

                  #28
                  Re: Dell 1704FPT

                  Originally posted by Rtech
                  Have just checked the faulty board I have,and that has the same symptoms as your has,BUT the fault is an open secondary on the Inverter Transformer T101,and am still waiting to find one,they should read approx 450 ohms.Also my R125 and the similar one on the other transformer is 2.2Mohms.
                  Thinking of buying a replacement PCB from EBAY:
                  Item number: 140512299224

                  If and when I do you can gladly have my faulty board for parts...

                  Comment

                  • Rtech
                    Badcaps Legend
                    • Jul 2010
                    • 1095

                    #29
                    Re: Dell 1704FPT

                    Originally posted by ralphup
                    Thinking of buying a replacement PCB from EBAY:
                    Item number: 140512299224

                    If and when I do you can gladly have my faulty board for parts...
                    Many thanks

                    Comment

                    • ralphup
                      Member
                      • Aug 2011
                      • 38
                      • UK

                      #30
                      Re: Dell 1704FPT

                      Originally posted by Rtech
                      Many thanks

                      Hello there, I have sent you a PM and await your response sir!

                      Comment

                      • pcarbery
                        New Member
                        • Sep 2012
                        • 5
                        • Ireland

                        #31
                        Re: Dell 1704FPT

                        Hi there all,

                        I know this is an old discussion, but it is the best I have found; and hope some of you might be able to help.
                        I am wondering if anyone has resolved this issue. I too have one of these Dell monitors that displays a screen for less than a second before going blank. I too have noticed a burnt R125 resistor (but still seems intact). I was thinking of replacing the inverter board but am reluctant to, if it is just going to fail again.

                        I suspect from reading other forums that one of the lights may be gone and that the board automatically shuts down all others once it senses this....perhaps this is why the R125 resistor is overheating.

                        Any help? ideas?

                        Comment

                        • Rtech
                          Badcaps Legend
                          • Jul 2010
                          • 1095

                          #32
                          Re: Dell 1704FPT

                          It may be the transformer that has failed ?? have you checked the Resistance of the secondaries ??

                          Comment

                          • pcarbery
                            New Member
                            • Sep 2012
                            • 5
                            • Ireland

                            #33
                            Re: Dell 1704FPT

                            hi Rtech, sorry for the late reply but couldnt get back to this project until now. Resistances of the secondaries are fine. A = 459 , B=434. all cap's look ok, no signs of any problems......will check them with DMM when I get a different one that can check farads. (I think I have one in work somewhere).
                            By the way, I can see the screen when I shine a flashlight on to it.

                            Comment

                            • Rtech
                              Badcaps Legend
                              • Jul 2010
                              • 1095

                              #34
                              Re: Dell 1704FPT

                              Originally posted by pcarbery
                              hi Rtech, sorry for the late reply but couldnt get back to this project until now. Resistances of the secondaries are fine. A = 459 , B=434. all cap's look ok, no signs of any problems......will check them with DMM when I get a different one that can check farads. (I think I have one in work somewhere).
                              By the way, I can see the screen when I shine a flashlight on to it.
                              If you can see the image,,then definitely a Backlight issue.

                              Comment

                              • pcarbery
                                New Member
                                • Sep 2012
                                • 5
                                • Ireland

                                #35
                                Re: Dell 1704FPT

                                Thanks Rtech, does you reply mean that it is one of the lights or could it still be the inverter board?

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: Dell 1704FPT

                                  Try test lamp?
                                  https://www.badcaps.net/forum/showthread.php?t=19987
                                  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

                                  • Rtech
                                    Badcaps Legend
                                    • Jul 2010
                                    • 1095

                                    #37
                                    Re: Dell 1704FPT

                                    Could still be either !! you really need a test Backlight to identify where it is.

                                    Comment

                                    • pcarbery
                                      New Member
                                      • Sep 2012
                                      • 5
                                      • Ireland

                                      #38
                                      Re: Dell 1704FPT

                                      thanks guys for the replies.....will test lamp and reply back in a few days

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #39
                                        Re: Dell 1704FPT

                                        You can get one of these for testing your lamps:
                                        http://www.ebay.com/itm/1pc-4-Lamp-B...ht_3916wt_1400

                                        http://www.ebay.com/itm/LCD-Monitor-...ht_1794wt_1400
                                        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

                                        • pcarbery
                                          New Member
                                          • Sep 2012
                                          • 5
                                          • Ireland

                                          #40
                                          Re: Dell 1704FPT

                                          Things happen slowly in my country....anyway, I finally fixed the monitor and am looking at it right now. In the end, I purchased a new inverter board on ebay for 20 bucks. I couldn't locate any bad caps (but are sure there were some) I took a chance that the lights were ok and went ahead with the purchase. I will post again if there is any problem with it. So far so good, but it has only been switched on for 1 hour.
                                          Thanks for all the help everyone.

                                          Comment

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