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Inverter tester using old CFL

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    #61
    Re: Inverter tester using old CFL

    Hi this is my first post and ask, what the symbol/name of connectors of like a thread autor badm, i ask becouse i have the same in may monitor Benq E2420HD, or where i can buy this connectors.

    Thanks

    Comment


      #62
      Re: Inverter tester using old CFL

      I am not sure of the technical name of the connector, but you could buy them on eBay with the wires already attached.

      I bought http://www.ebay.com/itm/10pcs-33cm-L...-/170901888573
      and some http://www.ebay.com/itm/1pc-1m-Unive.../190718837578?

      Only problem is they don't sell either of those anymore. You can maybe try Aliexpress, or just take old plugs\wire from a smashed screen or something.

      Make sure you if you need to extend the cable that you use proper HV-rated cable with correct insulation, at least 1.5kV rated I think for small screens\lamps, probably want 3kV for bigger ones, same for the heatshrink too of course.


      Another option too of course is to just solder the wires underneath the PCB, to the existing solder joints on the pins of the socket on the inverter board during testing, then you don't need plugs.
      Last edited by Agent24; 04-21-2016, 03:56 PM.
      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
      -David VanHorn

      Comment


        #63
        Re: Inverter tester using old CFL

        http://www.ccflwarehouse.com/hivowiandha.html
        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


          #64
          Re: Inverter tester using old CFL

          Thanks for help

          Comment


            #65
            Re: Inverter tester using old CFL

            Cool Idea, I work on a lot of laptops and salvaged a double backlight assembly and have been using it for years. Never thought about using a 120v cfl.

            Comment


              #66
              Re: Inverter tester using old CFL

              Hi,

              I joined this forum some time ago, but, have remained an infrequent visitor due to job, life and such things.

              I saw many posts about opening the CFL by using hacksaw, Vice etc.

              I use a fine flat-blade screwdriver that is sturdy (Should not be watchmaker's flat-blade). Just push the blade in to the slot between the cap and lamp base and twist the blade. Some time you may need to poke at 3 - 4 different spots around the circumference of the bulb.

              I normally collect the high voltage (AC rectification side) electro-caps and different inductors from these boards. I have found inductors are not readily available in the markets.

              Comment


                #67
                Re: Inverter tester using old CFL

                Thank you so much for learning in this site.

                Comment


                  #68
                  Re: Inverter tester using old CFL

                  Good job

                  Comment


                    #69
                    Re: Inverter tester using old CFL

                    hope its okay to bump this.

                    I have a philips 47pfl5704d / f7 aka (47" lcd tv) with back light issues.

                    see my thread here: https://www.badcaps.net/forum/showthread.php?t=60783

                    see my photo: do i just hook up 2 cfl to the psu at the orange triangle?

                    or is that powering the lcd? I could not locate an inverter board by its self.

                    the photo is of another tv, but very close to mine
                    Attached Files
                    Last edited by cwolford; 03-03-2017, 12:29 AM.

                    Comment


                      #70
                      Re: Inverter tester using old CFL

                      It looks like that LCD panel as shown in the picture used EEFL, not CCFL.
                      What is your LCD panel model number?
                      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


                        #71
                        Re: Inverter tester using old CFL

                        i will have to look tomorrow if i can find it. its 12:25 am here.

                        Comment


                          #72
                          Re: Inverter tester using old CFL

                          Originally posted by budm View Post
                          It looks like that LCD panel as shown in the picture used EEFL, not CCFL.
                          What is your LCD panel model number?
                          had to rip this thing apart to get this haha.
                          Attached Files

                          Comment


                            #73
                            Re: Inverter tester using old CFL

                            OK, LC470WUF, see spec sheet.
                            it does use CCFL and it has circuit board inside the panel with Balancer cap for each tube, similar setup to this one with a bunch of failed Ballast caps:
                            http://s807.photobucket.com/user/bud...?sort=3&page=1

                            CCFL-EEFL info, see page 3.
                            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


                              #74
                              Re: Inverter tester using old CFL

                              Originally posted by budm View Post
                              OK, LC470WUF, see spec sheet.
                              it does use CCFL and it has circuit board inside the panel with Balancer cap for each tube, similar setup to this one with a bunch of failed Ballast caps:
                              http://s807.photobucket.com/user/bud...?sort=3&page=1

                              CCFL-EEFL info, see page 3.
                              So tear it back down dig deeper look for bad caps. Thanks for the reply

                              Comment


                                #75
                                Re: Inverter tester using old CFL

                                Not yet, see your other thread.
                                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


                                  #76
                                  Re: Inverter tester using old CFL

                                  Can we use this method to check the LED Driver board in the new LED TV where LED Driver board is separate from the Power Supply Board, like in this

                                  Panel is LC500DUE SF/R1

                                  Comment


                                    #77
                                    Re: Inverter tester using old CFL

                                    thanks . good idea and now i can test my small sanyo DP19640b 19.2inch led tv. IT lights up and works for about a minute cold then goes dark . every power recycle from then on makes it come on for about 30 seconds and goes dark with sound still there . i was told it might be the backlight . very odd as its the first one i have seen go bad or wear out. its almost always the inverter . i will try it and then i will know !

                                    Comment


                                      #78
                                      Re: Inverter tester using old CFL

                                      CFL is not for testing LED backlights circuit.
                                      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


                                        #79
                                        Re: Inverter tester using old CFL

                                        Originally posted by budm View Post
                                        I force the bl_on line on mt tester board, you will have to have your monitor connected to the running PC but you do not need to have the screen T-CON connected.
                                        You have to have 4 working lamps, if one failed or not connected, the inverter will go onto shutdown mode.
                                        Is this also true for the 6 CCFL's models such as the 2407WFPb?

                                        Also, do you think those UV CCFL's would work too? I am an old school computer enthusiast who's been custom building rigs for 30+ years and I have lots of UV type CCFL's, the kinds you use to make PC's look nice and glowing. The one I was thinking of trying is at the link below.

                                        http://www.frozencpu.com/products/10...Tube_-_UV.html

                                        Comment


                                          #80
                                          Re: Inverter tester using old CFL

                                          That's a very interesting idea SkOrPn. Technically... or as far as I know... those CCFLs have similar voltage and current requirements, so you might be able to use one to test a monitor inverter. I'm actually very curious if that will work, as there's a computer store near me selling an UV CCFL kit (2 lamps + inverter) for $4 total. Sounds like a good deal to me.

                                          Now, as far as replacing the CCFLs in a monitor with UV CCFLs - I don't know about that. Most likely the colors would be way off or not there at all, as you need a white backlight. And also, a CCFL like that probably won't fit inside a monitor.
                                          Last edited by momaka; 11-01-2017, 07:44 PM.

                                          Comment

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