LG 60LN5400 Q409 burn

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  • capwizard
    Badcaps Legend
    • Jun 2016
    • 1991
    • USA
    #1

    LG 60LN5400 Q409 burn

    Instead of order the motherboard try to fix myself to save $100...The estimate is at 3.....
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    Last edited by capwizard; 12-27-2016, 03:17 PM.
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    • capwizard
      Badcaps Legend
      • Jun 2016
      • 1991
      • USA
      #2
      Re: 60LN5400 Q409 burn

      The SMD Codebook
      http://www.marsport.org.uk/smd/mainframe.htm

      It shows Q409 maybe is this:

      X7 BZX84-C47 Zet C SOT23 0.3W zener 47V±5%
      X7 CMDZ5227B CSC I SOD323 250mW zener 5% 3.6V

      Q407 shows is this MMBR901 SOT23 npn RF MRF901.

      Service manual only found this 55LN5200UB, i cant see its bury....

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      Last edited by capwizard; 12-27-2016, 04:39 PM.

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        • capwizard
          Badcaps Legend
          • Jun 2016
          • 1991
          • USA
          #3
          Re: 60LN5400 Q409 burn

          Service manual I found it! i am so cheap don't want pay nothing...

          http://service.minjja.lt/files/?id=5982

          https://www.manualslib.com/manual/79...e.html?page=52

          Q409 is AO3407A 30V P-Channel MOSFET:...........................
          https://cdn.badcaps-static.com/pdfs/...fa1ec3aa2d.pdf
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          Last edited by capwizard; 12-27-2016, 05:50 PM.

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            • capwizard
              Badcaps Legend
              • Jun 2016
              • 1991
              • USA
              #4
              Re: 60LN5400 Q409 burn

              Bad news, the Q409 is a switch for panel_Vcc, I doubt about TV panel has A short, need to find the pinout, then check the short.

              PS: I checked it has 121 ohm between tv chassis ground to panel_Vcc ( from T-con board), look like has A short to me.
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              Last edited by capwizard; 12-27-2016, 06:13 PM.

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                • myakimo
                  New Member
                  • Feb 2018
                  • 2
                  • usa
                  #5
                  Re: 60LN5400 Q409 burn

                  I have this same tv, 60fn5400, on the right side of screen, it does show picture but its in a sodt of white box? Have you ever sceen this?

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