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LJ41-04216A Cap C4712 trace damaged

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    LJ41-04216A Cap C4712 trace damaged

    Hi all, I was repairing a 50 inch samsung plasma with a power fault, got the power board repaired and tested and the tv now works ok but before a reassembled i seen a bulged cap on the x main board but when i was removing this i accidentally damaged the trace, I tried to scratch away a bit of the green covering to get to a trace to resolder the positive pin of the cap to but i cant seem to find any copper so can someone please tell me where i can solder a trace to as my circut tracing skills aren't the best, i'm still learning the ropes.. ;-)

    Also could someone tell me where is a good place to find schematics,..
    Attached Files
    Last edited by Easky15; 02-25-2014, 06:18 PM.

    #2
    Re: LJ41-04216A Cap C4712 trace damaged

    These boards are double sided. On that lead there is no connection on the bottom side but there would have been a pad purely to add strength and reduce strain on the top pad which is where this is connected to.

    I think I have one of these laying around but if you go to SJ you can see the underside and there is white masking there but no copper trace, just a pad.

    I did the same thing on the Ymain for the same series on a 680uF cap. Lost the bottom pad desoldering it. Just neaten that leg so it can't touch the exposed copper you have now created.

    To my knowledge you won't find any schematics for these. You will with the panasonic TVs.
    Last edited by tw2005; 02-26-2014, 03:01 AM.

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      #3
      Re: LJ41-04216A Cap C4712 trace damaged

      Well did not take me long to find the board. Pretty obvious there is no connection there. If you attempt to solder that lead to the nearest copper land then you will be shorting the - and + sides of the cap and what do you know, this is a 680uF cap.

      what a coincidence.

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        #4
        Re: LJ41-04216A Cap C4712 trace damaged

        Right i have got the set working but a prety loud buzzing sound coming from where that 680uf cap is located.. :-o
        Last edited by Easky15; 02-28-2014, 02:21 PM.

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          #5
          Re: LJ41-04216A Cap C4712 trace damaged

          Ok so I've tried a few times now and still cant get the tv to work without buzzing, Is there any other locations i can solder this 680uf cap to to get the set working again, Here's a few pics that might help, Be warned, It's not pretty.. ;-)
          Attached Files

          Comment


            #6
            Re: LJ41-04216A Cap C4712 trace damaged

            Scrape off the soldermask around that adjacent trace and solder to it. Same for ground.

            Do be aware that these plasmas are prone to buzzing if:
            - case is not fully secured
            - board is not fully secured
            - inductor resin (on the coils in the middle of the board) has dried out
            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


              #7
              Re: LJ41-04216A Cap C4712 trace damaged

              I would lay the cap on its side so you can easily solder the top side of the board which is connected to the B+, the bottom side you can scratch off the greens solder mast of that big trace which is connected to the fuse and bend the cap's leg over and solder to the exposed copper.
              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


                #8
                Re: LJ41-04216A Cap C4712 trace damaged

                No joy.... Back to clicking now, Does this look right what ive done??
                Attached Files

                Comment


                  #9
                  Re: LJ41-04216A Cap C4712 trace damaged

                  Just noticed your post there now tom, Screwed the board down and thats the set now fully working with no buzzing, Thanks very much everyone for all your help.. ;-)

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