Barco LCN-42 No Power

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  • Jasgriff
    Badcaps Veteran
    • Feb 2012
    • 578
    • UK

    #81
    Re: Barco LCN-42 No Power

    SMPS have arrived. Hopefully I will have them in my possession tomorrow night. Then we can see whats going on

    Also just won 2 more monitors to play about with which I should have in a couple of days.
    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

    How to resize your pictures guide click HERE
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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #82
      Re: Barco LCN-42 No Power

      The suspense is killing me!
      Last edited by budm; 03-26-2012, 11:07 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

      • Jasgriff
        Badcaps Veteran
        • Feb 2012
        • 578
        • UK

        #83
        Re: Barco LCN-42 No Power

        Right got the bits before I fit the transistors.....

        Q201 = npn
        Q202 = pnp

        I recall it being the other way around so I thought I would check
        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

        How to resize your pictures guide click HERE
        Retiredcaps Ideal post example click HERE

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        • Jasgriff
          Badcaps Veteran
          • Feb 2012
          • 578
          • UK

          #84
          Re: Barco LCN-42 No Power

          Right Parts fitted!

          I first turned it on for a short period of time and could hear a slight noise.

          Not sure if it was anything to worry about I turned it off and then tested the fuse etc to see if it had tripped again and it hadnt.

          I powered it back up and the 24v rail seems fine but the 18v one has no power. I also tried the 5v rail and this was just over 5v and steady.

          Does this mean the new smps ic and the transistors have worked because I now have power to those rails or was that smps looking after the 18v rail and thats why its not working?
          Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

          How to resize your pictures guide click HERE
          Retiredcaps Ideal post example click HERE

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          • Jasgriff
            Badcaps Veteran
            • Feb 2012
            • 578
            • UK

            #85
            Re: Barco LCN-42 No Power

            Noticed something else...

            GT1 + GT2 which are near the main fuse flash when I turn the power on. They look like Zener Diodes im guessing they are not supposed to flash?
            Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

            How to resize your pictures guide click HERE
            Retiredcaps Ideal post example click HERE

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            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #86
              Re: Barco LCN-42 No Power

              I think they are Gas Discharge tubes for surge protection (I do not see then on the top view of the power supply board picture), they should not flash (Conduct)unless there are surges, they should be rated at about 400v or more.
              Can I see the pictures?
              Well, the circuits are still not working. We replaced the damaged parts for the 18VDC power supply. We need to see if we have Vcc the SMPS IC you just installed, also recheck your soldering works just incase, right now the middle pin (Drain) of the new MOSFEt should have DC voltage on it, can you verify that?
              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

              • Jasgriff
                Badcaps Veteran
                • Feb 2012
                • 578
                • UK

                #87
                Re: Barco LCN-42 No Power

                You cannot see the gas discharge components as they are just hidden in this picture.

                See the big grey component on C1 I think this is where the noise is coming from.

                I will take a proper picture of where the flashes are coming from and I will check that the SMPS ic has power and the Mosfet that I changed.

                Apparently I have to watch a film now so I will try and do that once its finished.
                Attached Files
                Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                How to resize your pictures guide click HERE
                Retiredcaps Ideal post example click HERE

                Comment

                • Jasgriff
                  Badcaps Veteran
                  • Feb 2012
                  • 578
                  • UK

                  #88
                  Re: Barco LCN-42 No Power

                  Ok checked the VCC of the SMPS IC and it is showing 13.4v. This seems to be right. I will check the Mosfet now.

                  Ok 390v On the mosfet I have included a pic of the whole bottom of the board and how I measured it.
                  Attached Files
                  Last edited by Jasgriff; 03-27-2012, 04:24 PM.
                  Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                  How to resize your pictures guide click HERE
                  Retiredcaps Ideal post example click HERE

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #89
                    Re: Barco LCN-42 No Power

                    Can you take a reading of R207 one end is connected to the transfomer pin6, it is close to the IC SMPS you just replace? We have everything but it is not driving the gate of the MOSTFET.
                    Also set the volt meter to AC at about 20VAC scale AND CHECK PIN 5 to see if anything is coming out of that IC.
                    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

                    • Jasgriff
                      Badcaps Veteran
                      • Feb 2012
                      • 578
                      • UK

                      #90
                      Re: Barco LCN-42 No Power

                      Oh dear heard something click and smelt something burning. Turned it off and checked the fuse. The fuse was fine.

                      Plugged it back in and now im not getting anything on the big cap.
                      Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                      How to resize your pictures guide click HERE
                      Retiredcaps Ideal post example click HERE

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #91
                        Re: Barco LCN-42 No Power

                        Oh man! there should be something on the main filter cap unless the bridge is blown or the main fuse is blown. See if you do have AC at the bridge AC in.
                        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

                        • Jasgriff
                          Badcaps Veteran
                          • Feb 2012
                          • 578
                          • UK

                          #92
                          Re: Barco LCN-42 No Power

                          Got AC power going into the bridge rectifier but no DC coming out of it. Im guessing that where the smell came from.
                          Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                          How to resize your pictures guide click HERE
                          Retiredcaps Ideal post example click HERE

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #93
                            Re: Barco LCN-42 No Power

                            So the bridge check OK?
                            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

                            • Jasgriff
                              Badcaps Veteran
                              • Feb 2012
                              • 578
                              • UK

                              #94
                              Re: Barco LCN-42 No Power

                              Na the bridge has AC going in but no DC coming out.

                              ts15p06g Thats the model I will have to get one ordered tomorrow. I am guessing thats what was making the noise earlier so it wont hurt to change it.
                              Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                              How to resize your pictures guide click HERE
                              Retiredcaps Ideal post example click HERE

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #95
                                Re: Barco LCN-42 No Power

                                That is strange that the Bridge decide to quit on you. By the way, during all this testing, the board is connected to the rest of the boards right, it does not like running without the loads. If you are going to do stand alone then I would use lamps for load.
                                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

                                • Jasgriff
                                  Badcaps Veteran
                                  • Feb 2012
                                  • 578
                                  • UK

                                  #96
                                  Re: Barco LCN-42 No Power

                                  I had it all wired up to start with but I disconnected it all to test the ic on the bottom. I am thinking that the bridge rectifier was the bit making the noise which happened even underload so hopefully it was on its way out anyway. Its a powerfully recifier 800v 15A
                                  Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                  How to resize your pictures guide click HERE
                                  Retiredcaps Ideal post example click HERE

                                  Comment

                                  • Jasgriff
                                    Badcaps Veteran
                                    • Feb 2012
                                    • 578
                                    • UK

                                    #97
                                    Re: Barco LCN-42 No Power

                                    Right I'm trying to source a replacement recifier.

                                    The one that's in it is a Glass Passivated Recifier and the case is a TS-6P.

                                    This style of case seems to be very uncommon and I'm not sure if I have to use another Glass Passivated one?

                                    This is the nearest one I can find I am sure that will do.

                                    http://www.farnell.com/datasheets/58654.pdf
                                    Last edited by Jasgriff; 03-28-2012, 05:16 AM.
                                    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                    How to resize your pictures guide click HERE
                                    Retiredcaps Ideal post example click HERE

                                    Comment

                                    • Jasgriff
                                      Badcaps Veteran
                                      • Feb 2012
                                      • 578
                                      • UK

                                      #98
                                      Re: Barco LCN-42 No Power

                                      Ordered a couple of rectifiers. I am pretty sure they will be ok and they are coming from Farnell in the UK so with a bit of luck they will be here within a couple of days. I am really hoping that when fitted it makes no noise and then I can continue to try and get the 18V side of things up and running.
                                      Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                      How to resize your pictures guide click HERE
                                      Retiredcaps Ideal post example click HERE

                                      Comment

                                      • Jasgriff
                                        Badcaps Veteran
                                        • Feb 2012
                                        • 578
                                        • UK

                                        #99
                                        Re: Barco LCN-42 No Power

                                        Right fitted a new recifier and tested again. I am getting AC on the middle pins but nothing out of the DC pins so there is nothing going to the big filter cap. I am now wondering if the filter cap has blown?

                                        What else can I check to find out why I am getting no DC?
                                        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                        How to resize your pictures guide click HERE
                                        Retiredcaps Ideal post example click HERE

                                        Comment

                                        • Jasgriff
                                          Badcaps Veteran
                                          • Feb 2012
                                          • 578
                                          • UK

                                          #100
                                          Re: Barco LCN-42 No Power

                                          Right took the cap out then put it back in and tested again.

                                          The cable that I used to power the set blew the 5A fuse in the plug so I swapped that for a 12A fuse and tried again and it blew the resistor again?

                                          Right checked the Mosfet that blew the first time and its blown again. The other components look to be ok this time just the resistor and the mosfet so there must be something else thats causing the mosfet to blow.
                                          Last edited by Jasgriff; 03-29-2012, 11:22 AM.
                                          Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                          How to resize your pictures guide click HERE
                                          Retiredcaps Ideal post example click HERE

                                          Comment

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