Samsung LE32B450C4W smoking ccfl xfrm

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  • notallbad
    Badcaps Legend
    • Oct 2012
    • 1190
    • UK

    #1

    Samsung LE32B450C4W smoking ccfl xfrm

    Samsung
    LE32B450C4WXXU

    Power / Inverter board : BN44-00261B

    TV received with a dark band across the top, picture fine - backlight issue.

    Tested ccfl xfrm and replaced after finding differences between the 2 on the board.

    Replaced transformer QGAH02094 NY0903FB with QGAH02094 0 11TM49 A.

    Had it on for an hour and had a burning smell, thought it was burning off lacquer from the new xfrm, but now when turning tv on it smokes and almost immediately after turning on.

    Could just be a dodgy xfrm, ebay seller immediately refunded, no questions or fuss, did advise could be fault on board causing this.

    Anyone had any experience with these xfms?


    On inspection found the HV output side burning/smoking and the resistance is way high,
  • notallbad
    Badcaps Legend
    • Oct 2012
    • 1190
    • UK

    #2
    Re: Samsung LE32B450C4W smoking ccfl xfrm

    Photos to follow along with a few quick tests.

    Comment

    • notallbad
      Badcaps Legend
      • Oct 2012
      • 1190
      • UK

      #3
      Re: Samsung LE32B450C4W smoking ccfl xfrm

      So driving the top ccfl lamps with the 'good' xfrm, moved psu/inverter board up so the bottom xfrn is connected to the top lamps, the lamps come on briefly, 2 secs to black obviously as the other xfrm is not connected to anything, no flickering like is does with the 'bad' xfmr and no smoking/burning.

      I think this test is good enough to eliminate the lamps/wiring.

      As a note, when connecting the 'bad' xfmr to the bottom lamps the xfmr still smokes/burns.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Samsung LE32B450C4W smoking ccfl xfrm

        That would be a reasonable elimination.

        How about a picture of the power board?

        Maybe the transformers are different parts? Check schematic, if available, to be sure.

        Are they driven from the same power electronics (transistors, etc) and is it a 24V inverter or high voltage (primary side powered, danger of electric shock etc.)
        Last edited by tom66; 12-04-2014, 05:26 AM.
        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

        • notallbad
          Badcaps Legend
          • Oct 2012
          • 1190
          • UK

          #5
          Re: Samsung LE32B450C4W smoking ccfl xfrm

          Photos
          Attached Files

          Comment

          • notallbad
            Badcaps Legend
            • Oct 2012
            • 1190
            • UK

            #6
            Re: Samsung LE32B450C4W smoking ccfl xfrm

            On COLD side of xfrm QGAH02092 SW , so must be driven by 24v.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Samsung LE32B450C4W smoking ccfl xfrm

              It appears to use a transformer to drive the transformers. TI9015. That creates the pri-sec isolation. Not a 24V design though.
              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

              • notallbad
                Badcaps Legend
                • Oct 2012
                • 1190
                • UK

                #8
                Re: Samsung LE32B450C4W smoking ccfl xfrm

                Isn't that TI801S?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Samsung LE32B450C4W smoking ccfl xfrm

                  Yes... probably... hard to read in your photo
                  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

                    #10
                    Re: Samsung LE32B450C4W smoking ccfl xfrm

                    I ran into two of these setups and the lamps were bad, it has blackened ends (you can see red glow at the ends inside the lamps) and draw lots of current even though the lamps still light up. I would inspect the lamps real well also.
                    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

                    • Shinju
                      Badcaps Legend
                      • Mar 2014
                      • 1239
                      • USA

                      #11
                      Re: Samsung LE32B450C4W smoking ccfl xfrm

                      Also these boards are known for bad soldier joints on the aluminum rails so I would check for that too.

                      I have repaired several of this style of PS/INV 4 to 3 to 2 transformer types. All of them have had at least 1 loose connection.

                      Comment

                      • Alastair E
                        Chief Womble
                        • Mar 2013
                        • 1963
                        • U.K.

                        #12
                        Re: Samsung LE32B450C4W smoking ccfl xfrm

                        Looks like a dry-joint on that Tx leg caused a burn-up.....
                        TELEFIX

                        How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                        http://www.irf.com/technical-info/appnotes/an-1088.pdf
                        PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                        Comment

                        • notallbad
                          Badcaps Legend
                          • Oct 2012
                          • 1190
                          • UK

                          #13
                          Re: Samsung LE32B450C4W smoking ccfl xfrm

                          Thanks for the replies.

                          Was hoping not to have to tear down the bl panel but may have to just to be sure there are no bad lamps as suggested.

                          I believe the solder joint to have been made good as were the others though possible I may not have made a good enough job on that joint and caused the issue.

                          Comment

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