Replacement IGBT's for LG TV reading weird

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  • TURSTY
    New Member
    • Aug 2023
    • 2
    • New Zealand
    #1

    Replacement IGBT's for LG TV reading weird

    Hi guys,

    I have a LG Plasma that went bang one night.

    Long story short, I took it to a "professional" shop to repair the YSUS board that was shorted and they did a half ass job.

    I'm a long way down the path of teaching myself component level repair, but not 100% confident in everything yet, hence what might be a basic question.

    The repair shop replaced 3 transistors on one of the two heat sinks and fixed one short, but the second set of transistors on the second sink still had a short.

    So I removed this sink and the attached components and found another 3 shorted components.

    I have since purchased replacements off AliExpress - 30F126 IGBT's.

    Here is my question. When I test the new 30F126's on a multi-meter in diode mode or continuity, I get nothing. No diode junction from Base to Emiter or collector, and no shorts. When I test all the other Transistors, I get a diode junction acorss Base to emiter.
    Am I right in expecting new 30F126's to give me a reading on a multimeter, or do I need to go buy a component analyser?
    Trying to work out if these new components are duds or not before I install them.

    Cheers,
    Sam
    Tags: None
    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12097
      • U.S.
      #2
      Re: Replacement IGBT's for LG TV reading weird

      You may have some fake ones, not sure but they are surely faulty, some testing of IGBT there: https://www.youtube.com/watch?v=vYZW6BFD7ak

        Comment

        • tvtimmy
          Badcaps Legend
          • Mar 2015
          • 1160
          • usa
          #3
          Re: Replacement IGBT's for LG TV reading weird

          You definitely have fakes! Do not use them or you may do more damage.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12097
              • U.S.
              #4
              Re: Replacement IGBT's for LG TV reading weird

              maybe you can share the name or ID of the seller on ali, if they are selling bogus components we can at least make a note to avoid them.

                Comment

                • petehall347
                  Badcaps Legend
                  • Jan 2015
                  • 4426
                  • United Kingdom
                  #5
                  Re: Replacement IGBT's for LG TV reading weird

                  they dont have a base ..its the gate ..very low turn on datasheet here ....https://www.datasheet-pdf.info/entry/30F126
                  Last edited by petehall347; 08-04-2023, 07:08 PM.

                    Comment

                    • tvtimmy
                      Badcaps Legend
                      • Mar 2015
                      • 1160
                      • usa
                      #6
                      Re: Replacement IGBT's for LG TV reading weird

                      Here is my transistor tester in action.
                      Attached Files

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