Light Fixture UK Overloaded 240v to 12v

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  • anotherdude
    Badcaps Veteran
    • Feb 2013
    • 488
    • uk

    #1

    Light Fixture UK Overloaded 240v to 12v

    So a few bulbs had blown a while ago in this rather expensive light fixture, I bought new bulbs (16w) and put them in all was great until later that night when it suddenly completely turned off.

    Having looked at the light again it has stickers next to each bulb socket stating 10w so i'm assuming it's just overloaded, the light has space for 6 bulbs at 10w each.

    So i'd replaced 4 bulbs with 16w ones so it was using 2x10w and 4x16w when it went off, when really it should of only had 6x10w resulting in 60w, instead it had 84w, so I can only assume this was the problem.

    Rather than bin it I thought i'd ask here if anyone can provide any help on diagnosing the faulty part, it converts the 240v to 12v.

    Haven't taken any readings from it yet as it's been removed and been replaced, i'm hoping it's just a fuse somewhere but no idea what really to look for.

    Any help is greatly appreciated.
    Attached Files
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30910
    • Albion

    #2
    Re: Light Fixture UK Overloaded 240v to 12v

    look closely at the soldering, some joints are cracked.

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30910
      • Albion

      #3
      Re: Light Fixture UK Overloaded 240v to 12v

      without even trying - i see these.
      Attached Files

      Comment

      • anotherdude
        Badcaps Veteran
        • Feb 2013
        • 488
        • uk

        #4
        Re: Light Fixture UK Overloaded 240v to 12v

        Originally posted by stj
        without even trying - i see these.
        Resoldered all points, still the same

        Comment

        • goontron
          5000!
          • Dec 2011
          • 4108
          • US

          #5
          Re: Light Fixture UK Overloaded 240v to 12v

          Why did i think you were trying to fix a fluorescent ballast?
          Im going back to bed......
          Last edited by goontron; 08-14-2015, 03:53 PM.
          Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

          "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

          Excuse me while i do something dangerous


          You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

          Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

          Follow the white rabbit.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Light Fixture UK Overloaded 240v to 12v

            Are the lamps Halogen 12V Lamps/ It looks like a simple 12VAC output high frequency switcher.
            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

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Light Fixture UK Overloaded 240v to 12v

              Can you zoom in so the whole board will show without seeing the table? Make sure they are in focus also.
              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

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Light Fixture UK Overloaded 240v to 12v

                BTW, the fusible resistor and the Thermistor are OK?
                There two power devices strapped to the heatsinks, did you check them out?
                Attached Files
                Last edited by budm; 08-14-2015, 03:41 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

                • anotherdude
                  Badcaps Veteran
                  • Feb 2013
                  • 488
                  • uk

                  #9
                  Re: Light Fixture UK Overloaded 240v to 12v

                  Originally posted by budm
                  Are the lamps Halogen 12V Lamps/ It looks like a simple 12VAC output high frequency switcher.
                  yep halogen 12v, will get more pictures later today

                  Comment

                  • anotherdude
                    Badcaps Veteran
                    • Feb 2013
                    • 488
                    • uk

                    #10
                    Re: Light Fixture UK Overloaded 240v to 12v

                    Originally posted by budm
                    BTW, the fusible resistor and the Thermistor are OK?
                    There two power devices strapped to the heatsinks, did you check them out?
                    No visible damage, will check what you said

                    Heres more pictures best I could do

                    Fusible resistor checks out fine

                    R2 on the back of the board looks damaged looking at it again, camera is playing up will try get more
                    Attached Files
                    Last edited by anotherdude; 08-16-2015, 11:46 AM.

                    Comment

                    • Agent24
                      I see dead caps
                      • Oct 2007
                      • 4913
                      • New Zealand

                      #11
                      Re: Light Fixture UK Overloaded 240v to 12v

                      Probably you'll find something has gone open-circuit.
                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                      -David VanHorn

                      Comment

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