Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

    Originally posted by shepp
    might work out cheaper to find a replacement board, what is the number on the transformers, i have a invertor here that may have the same transformers
    Mine are 6800 series

    6800 M B 0714G-
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

      I have never seen the inverter transformer with that high DC resistance (~9K).
      The pin out should be the same as yours transformer.
      http://lcdparts.net/TransformerDetai...ProductID=2772
      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

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

        Originally posted by budm
        I have never seen the inverter transformer with that high DC resistance (~9K).
        The pin out should be the same as yours transformer.
        http://lcdparts.net/TransformerDetai...ProductID=2772
        I've seen up to 6.5k on a 26" Samsung, but 9k is very high, I agree. In addition, there are only 7 transformers, meaning 7 tubes, which is a small number for a 32" (the 26" Samsung I serviced had 8 transformers, a 37" Philips had 12.)
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

          If I am correct, one transformer drives two lamps, as you can see, there are two high voltage windings on the transformer.
          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

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

            Originally posted by budm
            If I am correct, one transformer drives two lamps, as you can see, there are two high voltage windings on the transformer.
            Okay - that makes a bit more sense. So I might have been checking them in series, but I get >66Megohm resistance (OL on my meter) between any other pins.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

              The two pins on each end are for the each winding as shown in the link. You can take one out a nd you can easily see what I am talking about.
              By the way, is the board made by DARFON?
              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

              • Scenic
                o.O
                • Sep 2007
                • 2642
                • Germany

                #27
                Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                Got the inverter in front of me right now. The transformer wiring from budm's post (the lcdparts.net link) doesn't match. If I go by that, all primaries (on all transformers) measure open.

                Transformers on mine are labelled "6800 M 0722G-"
                Not quite sure wtf is going on with the results, but this inverter was working fine. Before disassembling the TV (cracked panel, only 1/3rd still visible) it ran through a 7 hour nonstop test without any hiccups.

                edit: Inverter is a DAC-24T042 Rev. 05A by Delta Electronics (?)
                Attached Files
                Last edited by Scenic; 03-26-2012, 11:24 AM.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #28
                  Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                  That's similar to my results, except the outer transformers measure 90k each on all secondaries. (One measures 98k, which is suspect.)

                  I will check later for drive waveforms... I have a feeling the inverter controller IC is dead.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                    Hi Scenic, are those the resistance reading on your transformers also, seems to match what TOM is seeing. Look like we need to remove the transformer from the board and see how they are wired up.
                    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

                    • shepp
                      Badcaps Veteran
                      • Mar 2012
                      • 377
                      • England

                      #30
                      Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                      this is what you should be measuring from budm's link, make sure your meter is set to the lowest range for 0.8 ohm tho, i did mine in circuit so as long as there not well out and all connectors are off the board you should be able to get the correct or there abouts readings, they may appear to be short if your meter is set to the wrong range because 0.8 ohms is nothing some meters might not measure this depends how good your meter is.


                      how are you measuring to get 90k-98k?

                      hope this helps
                      Attached Files
                      Last edited by shepp; 03-26-2012, 12:26 PM.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #31
                        Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                        Makes more sense, thanks. Now getting consistent ~700 ohm (+/-1%) readings.

                        I can only find one primary on each transformer, they all test 0.3-0.4 ohms.
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                          Shepp's picture is the same as the one in the link, now I am confused! It has only one primary windings, and two high voltage windings, two MOSFET's for the two primaries of the transformers in series driven by half bridge setup. All the readings are in DC resistance, the impedance will be higher, and you need the ringer tester to find out if it has shorted turn or not.
                          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

                          • shepp
                            Badcaps Veteran
                            • Mar 2012
                            • 377
                            • England

                            #33
                            Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                            p1 and p2 are first primary, p3 and p4 are second primary, and s1 to s2 and s3 to s4 for secondary windings in respect to 1st primary and 2nd primary

                            what do you mean by dc resistance? resistance is ohms? there is no dc or ac in resistance measurement? thats why you never check resistance when power is on...you will blow your meter
                            Last edited by shepp; 03-26-2012, 12:41 PM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                              This why I am confused:
                              "Got the inverter in front of me right now. The transformer wiring from budm's post (the lcdparts.net link) doesn't match. If I go by that, all primaries (on all transformers) measure open." per post 27. I think we still need to see the actual pictures of the transformer in question.
                              Last edited by budm; 03-26-2012, 12:44 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

                              • shepp
                                Badcaps Veteran
                                • Mar 2012
                                • 377
                                • England

                                #35
                                Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                                Originally posted by Scenic
                                Got the inverter in front of me right now. The transformer wiring from budm's post (the lcdparts.net link) doesn't match. If I go by that, all primaries (on all transformers) measure open.

                                Transformers on mine are labelled "6800 M 0722G-"
                                Not quite sure wtf is going on with the results, but this inverter was working fine. Before disassembling the TV (cracked panel, only 1/3rd still visible) it ran through a 7 hour nonstop test without any hiccups.

                                edit: Inverter is a DAC-24T042 Rev. 05A by Delta Electronics (?)
                                thats not what you should be measuring as in attached picture on post above^^

                                Comment

                                • shepp
                                  Badcaps Veteran
                                  • Mar 2012
                                  • 377
                                  • England

                                  #36
                                  Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                                  all the primarys should be roughly the same and all the secondarys should be roughly the same, ive only marked one side but the other side should be mirror image for readings, they should all be slightly differant by a fraction, but look for any that are well out compared to the others




                                  picture as per SCENICs upload
                                  Attached Files
                                  Last edited by shepp; 03-26-2012, 12:59 PM.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #37
                                    Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                                    One thing is that you are looking at the bottom view of the transformer, when you look at the top view as it is mounted on the PCB, then you can see that the Primary pins are connected to the traces close to the MOSFET's. the other two top pins will read zero. And that is why there is marking for pin 1 on the PCB for proper mounting of the transfromer.
                                    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

                                    • shepp
                                      Badcaps Veteran
                                      • Mar 2012
                                      • 377
                                      • England

                                      #38
                                      Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                                      thats irrelevent, because your still measuring top to bottom pins not left to right etc, so you should still get correct readings across the correct pins, even if 2 primarys are connected you are still only measuring 1 winding so should still get the reading

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                                        Okay, so I checked the waveform at the transformer primary pins using a scope.

                                        Completely dead, nothing, zip, nil, nada.

                                        Fuses are good, so controller's probably shot. I'll have to replace the heating element in my Aoyue 968 before replacing that IC. Unless anyone has an inverter going spare (Scenic ...?)
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #40
                                          Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED

                                          But there are no wires attach to the P2 and P4, you can see the wire wrapped around P1 and P3. I look at my similar transformers I have, only one primary winding and two secondary winding, you can also see the white triangle marking on the footprint of the transformer. Unless my transformers are not the same setup as his, that is why we need to see the bottom side of the transformer.
                                          Last edited by budm; 03-26-2012, 01:54 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

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