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    #1

    Transistors needed

    I am currently working on a Di-fusion EZ17F monitor with failed backlights caused by two transistors on the inverter being shorted. The transistors are ZTX1049A (also known as FZT1049A). There are 4 on the board and they appear to carry out exacltly the same function as C5707 on the Dell and Benq boards.
    Anyone come across these before and know a source to get them from or even another equivalent?
    Many thanks.
    Tags: None
    #2
    Re: Transistors needed

    http://www.newark.com/97K0389/suppli...zetex-fzt1049a
    Mann-Made Global Warming.
    - We should be more concerned about the Intellectual Climate.
    -
    Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
    - Dr Seuss
    -
    You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
    -

    Comment

      #3
      Re: Transistors needed

      Errmm...

      SMD or TO-92 ?

      Originally posted by johnboy183
      ...transistors are ZTX1049A (also known as FZT1049A)...
      FZT1049A is SMD here: http://www.mouser.com/Search/Refine....eyword=fzt1049

      ZTX1049A is TO-92 here: http://www.mouser.com/Search/Refine....eyword=ztx1049

      Toast
      veritas odium parit

      Comment

        #4
        Re: Transistors needed

        Nice find Toasty at Newark that was a direct ship from Farnell in the UK and thats a $20 processing fee.
        Elements of the past and the future combining to make something not quite as good as either.

        Comment

          #5
          Re: Transistors needed

          ...caused by two transistors on the inverter being shorted...
          Did you test those in circuit or out of circuit?

          If in circuit, they may be the ones with their collector-emitter junction across the ballast/transformer primaries and will always show shorted.

          If out of circuit, did you reverse meter probes to see if you get the same readings from lead to lead of device?

          A pic of the board would be cool too.

          Toast
          veritas odium parit

          Comment

            #6
            Re: Transistors needed

            Originally posted by Krankshaft
            Nice find Toasty at Newark that was a direct ship from Farnell in the UK and thats a $20 processing fee.
            Just wanted to point out it's a current (not obsolete) part.
            Wasn't suggesting to buy there.
            Mann-Made Global Warming.
            - We should be more concerned about the Intellectual Climate.
            -
            Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
            - Dr Seuss
            -
            You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
            -

            Comment

              #7
              Re: Transistors needed

              Thanks everyone thats very helpful. They are TO92 (but I also have another problem monitor with an smd version thats faulty as well).
              I tested them out of circuit and two are definatelly shorted ( a reading in all directions and all pins).
              They dont seem too far away in spec to C5707 (not that I am any expert on these specs) so I wonder if I could risk trying a couple of these as I have a fair number of these !
              Alternativelly has anyone come across ZTX1049A or FZT1049A in another monitor or piece of electronics so I could go scavenging?!
              I will post a photo of the inverter when I get time
              Regards
              Johnboy

              Comment

                #8
                Re: Transistors needed

                Nothing ventured nothing gained - I tried using C5707s to replace the two shorted ZTX1049 and lo and behold the backlights fired up. Early days but the monitor has ran all evening without problem and I will test it over the next few days to see if the substitution lasts. Before anyone points out that the BC and E are on different pins on the C5707s I was aware of that and managed to instal them slightly differently to keep the pins correct.

                Comment

                  #9
                  Re: Transistors needed

                  Good Job!
                  Mann-Made Global Warming.
                  - We should be more concerned about the Intellectual Climate.
                  -
                  Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                  - Dr Seuss
                  -
                  You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                  -

                  Comment

                    #10
                    Re: Transistors needed

                    Excellent!

                    But-

                    Keep the fire extinguisher nearby.....
                    veritas odium parit

                    Comment

                      #11
                      Re: Transistors needed

                      In to the third day of running now with the substituted C5707s with no obvious problems so will assume a fix. Hope this helps someone else with a similar problem.

                      Comment

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