Samsung lw26a33wx - No picture

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  • h0ffman
    Member
    • May 2013
    • 20
    • UK
    #1

    Samsung lw26a33wx - No picture

    Hi Guys. I'm new here and very much a noob but have a real interest in fixing stuff.

    I got this Samsung lw26a33wx from a friend of mine when it spotted working recently. Symptoms are that it powers up, makes the power up noise but nothing comes on the screen. At one point it did show a very faint picture.

    After a few searches it seems as though its the inverter transformer. So I took it apart and located the board. With the back off i plugged it back in and powered it up one of the two two transformers makes an electrical kinda hissing sound for a little bit.

    My real question is how do you actually test each of these transformers? I've got a multimeter, but I don't really know what I'm doing with it?
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    • ben7
      Capaholic
      • Jan 2011
      • 4059
      • USA
      #2
      Re: Samsung lw26a33wx - No picture

      The hissing transformer is definitely bad. That hissing sound is from arcing inside. Not sure which pins are for the high voltage, but with the power off, off you can measure the resistance of them to see if there are any abnormal readings.
      Muh-soggy-knee

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870
          #3
          Re: Samsung lw26a33wx - No picture

          See Here http://www.lcdparts.net/TransformerD...ProductID=3189

          Power off for 5 mins or so then meter on ohms 2000 test S1 to S2 then S3 to S4
          on every transformer and post the results
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • h0ffman
              Member
              • May 2013
              • 20
              • UK
              #4
              Re: Samsung lw26a33wx - No picture

              Awesome, cheers guys. I wasn't quite sure if I set my crappy multi meter to 2000 ohms, however testing them all from the points you said all read the same apart from the top one where two points read nothing. This is also where the hissing was coming from.

              Got a replacement on order now Will let you know how I get on.

              Cheers

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Samsung lw26a33wx - No picture

                  I fixed one of these a while ago and it was a bad inverter transformer too.
                  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

                    • h0ffman
                      Member
                      • May 2013
                      • 20
                      • UK
                      #6
                      Re: Samsung lw26a33wx - No picture

                      Hey Tom, its actually your thread which pops up in a google search

                        Comment

                        • h0ffman
                          Member
                          • May 2013
                          • 20
                          • UK
                          #7
                          Re: Samsung lw26a33wx - No picture

                          Just a quick update to say the replacement Inverter Transformer was soldered in place today and now the TV is working perfectly

                          With that and the SNES I fixed yesterday, I seem to be on a roll!!

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Samsung lw26a33wx - No picture

                              Nice one.
                              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

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