Transistor Help - Please

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  • weasel440
    Member
    • Aug 2010
    • 23
    #1

    Transistor Help - Please

    I'm working on a philips 32PFL3504D/F7 and I found some bad transistors. I was wondering if anyone has a way to cross these over to another brand or maybe a site that would carry all 3 that I need. I really don't want to order from several places due to high shipping costs for penny parts. Or if someone on here that might want to sell me some?

    Part #'s i'm looking for are....
    KTA1267, KTC3198 & 2SA950. These numbers are taken from the service manual for this tv. I've also added pictures of the data sheet for each I need.
    Attached Files
    Tags: None
    • Th3_uN1Qu3
      Believe in
      • Jul 2010
      • 6031
      • Romania
      #2
      Re: Transistor Help - Please

      For the KTA/KTC you can use the common 2N3904/2N3906 which you can get for super cheap even at Radio Shack. For the 2SA950 i'll have to take a better look, i would have said 2N2907 but that has a higher saturation voltage and will heat up more. If there's room you can buy 2907s anyway and use two in parallel.
      Originally posted by PeteS in CA
      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
      A working TV? How boring!

        Comment

        • weasel440
          Member
          • Aug 2010
          • 23
          #3
          Re: Transistor Help - Please

          I have another question on a different transistor? I can't seem to locate a spec sheet. transistor is a 2SD400(E).

          is this a good testing method? Test each pair of leads both ways (six tests in total):

          The base-emitter (BE) junction should behave like a diode and conduct one way only.
          The base-collector (BC) junction should behave like a diode and conduct one way only.
          The collector-emitter (CE) should not conduct either way.

          Taken from this site... http://www.kpsec.freeuk.com/components/tran.htm
          Last edited by weasel440; 12-01-2010, 11:12 AM.

            Comment

            • jetadm123
              Badcaps Legend
              • Feb 2010
              • 2169
              #4
              Re: Transistor Help - Please

              2SD400 spec sheet
              Attached Files

                Comment

                • Radio Fox
                  Badcaps Veteran
                  • Jan 2010
                  • 281
                  • UK
                  #5
                  Re: Transistor Help - Please

                  Originally posted by weasel440
                  ...is this a good testing method? Test each pair of leads both ways (six tests in total):

                  The base-emitter (BE) junction should behave like a diode and conduct one way only.
                  The base-collector (BC) junction should behave like a diode and conduct one way only.
                  The collector-emitter (CE) should not conduct either way.

                  Taken from this site... http://www.kpsec.freeuk.com/components/tran.htm
                  Yes, but the readings differ depending on whether you are using a digital meter or an analogue meter.

                  If you are testing an NPN transistor with a digital meter using the diode test setting, then it will measure the voltage drop with the red lead on the base. If you use an analogue meter set to a low Ohms range, then it will read with the black lead on the base.
                  ________________________________________________

                  Invisible airwaves crackle with life
                  Bright antennae bristle with the energy
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                    Comment

                    • weasel440
                      Member
                      • Aug 2010
                      • 23
                      #6
                      Re: Transistor Help - Please

                      ty for the help so far. I'm using a DMM (craftsman) need to eventually get something better. Is there any markings on the transistors to tell what style case it has? If you click on the link and scroll down to "connecting" you'll see what my question is about. I'm refering to style (TO92A, TO92B, TO92C) http://www.kpsec.freeuk.com/components/tran.htm#table
                      Attached Files

                        Comment

                        • Radio Fox
                          Badcaps Veteran
                          • Jan 2010
                          • 281
                          • UK
                          #7
                          Re: Transistor Help - Please

                          Originally posted by weasel440
                          ty for the help so far. I'm using a DMM (craftsman) need to eventually get something better. Is there any markings on the transistors to tell what style case it has? If you click on the link and scroll down to "connecting" you'll see what my question is about. I'm refering to style (TO92A, TO92B, TO92C) http://www.kpsec.freeuk.com/components/tran.htm#table
                          You will very rarely find markings on the transistor itself to show which leads are which. Search for the transistor, & download the data sheets as you did in your first post.
                          ________________________________________________

                          Invisible airwaves crackle with life
                          Bright antennae bristle with the energy
                          ________________________________________________

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