Lg 32LB75

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  • nezocas
    Member
    • Oct 2015
    • 27
    • Alcanena

    #1

    Lg 32LB75

    Hello,

    Tv not starting correctelly... goes out of standby with green led and back to standby.
    PSU: EAY38639701
    All caps in PSU were ESR and capacitance tested, inclunding the problematic ones on the mainboard C227/543/958/853/959/970.
    PFC is 395Vdc
    If I bypass the ERROR pin in the plug 201 and connect it with a 100homs resistor to the 5v rail, Tv workΒ΄s with sound but no backligth present.
    All voltages on p201 present with the bypass.
    Not sure what to do...???

    Regards
    Nezocas
    Last edited by nezocas; 01-03-2022, 05:14 AM.
  • Garion60
    New Member
    • Jan 2022
    • 6
    • United States

    #2
    Re: Lg 32LB75

    Can you provide more symptom details, please?

    Comment

    • neilc6
      Badcaps Legend
      • Nov 2015
      • 1550
      • Canada

      #3
      Re: Lg 32LB75

      If TV has no backlight or flash of backlights, backlights are the first suspect. Especially LG LA, LN, LB or LF series.

      Comment

      • nezocas
        Member
        • Oct 2015
        • 27
        • Alcanena

        #4
        Re: Lg 32LB75

        Hello again,

        All 14 CCFL tubes were tested individually with my tester.
        On the Q707 there is only 18v, it should be 24v from what I have read online.
        But I have no schematic from this PSU.

        I have followed this topic, but the fault is not the same, I dont even get a blink from the tubes:
        https://www.badcaps.net/forum/showthread.php?t=37829

        Comment

        • neilc6
          Badcaps Legend
          • Nov 2015
          • 1550
          • Canada

          #5
          Re: Lg 32LB75

          Sorry thought TV was LED. Not familiar with European model numbers. Odd LG reusing the numbers. CCFL TVs are pretty old and obsolete and 32 in one can be usually found for free. Maybe someone more experienced with CCFLs can help you. You can check for shorted FETS on the inverter board and also measure the secondary transformer impedances to see if they match.

          Comment

          • nezocas
            Member
            • Oct 2015
            • 27
            • Alcanena

            #6
            Re: Lg 32LB75

            Hi,
            Tv was scraped, to many hours to fix old tv.
            Thanks
            Regards

            Comment

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