LG 50PK550 turn on then off

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  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 979
    • Sweden
    #1

    LG 50PK550 turn on then off

    LG 50PK550 HD plasma, which tries to power on, all screen goes gray one second then turns off.
    I've read about the problems associated with the SMPS board, with the switching regulator ICE3BR1565JF.
    BUT - when taking some resistance measurements on the Y-BUFFER boards I noticed one thing that I need your opinion about.
    When Y-SUS board is connected to Y-BUFFER's I get a reading of 10ohms (exactly) across the small diodes pointed out with yellow lines in the attached picture. Is this a normal reading?
    As soon as Y-SUS is removed, the diode drops measures correct.
    I can't find any powercircuit failure on the Y-SUS board.
    Attached Files
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    • blib
      Senior Member
      • Feb 2012
      • 56
      • UK
      #2
      Re: LG 50PK550 turn on then off

      Check and replace 2 X 22ohm 5 watt resistors on smps

        Comment

        • PowerAmpFreak
          Badcaps Veteran
          • Feb 2010
          • 979
          • Sweden
          #3
          Re: LG 50PK550 turn on then off

          Originally posted by blib
          Check and replace 2 X 22ohm 5 watt resistors on smps
          Thanks, but please clarify.
          Does those resistors if open, causing SMPS to shut off?
          Nothing to do with the ICE3BR1565JF controller then?
          What about the 10-ohms reading on buffer boards, normal reading?

            Comment

            • blib
              Senior Member
              • Feb 2012
              • 56
              • UK
              #4
              Re: LG 50PK550 turn on then off

              Had this fault twice now.Turned out to be one of the two stand up resistors on the corner of the board.If the ICE3BR1565JF goes I think it takes out the fuse nearby.

                Comment

                • retiredcaps
                  Badcaps Legend
                  • Apr 2010
                  • 9271
                  #5
                  Re: LG 50PK550 turn on then off

                  These threads might be relevant...

                  https://www.badcaps.net/forum/showthread.php?t=24646

                  https://www.badcaps.net/forum/showthread.php?t=25145
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                    Comment

                    • PowerAmpFreak
                      Badcaps Veteran
                      • Feb 2010
                      • 979
                      • Sweden
                      #6
                      Re: LG 50PK550 turn on then off

                      Blib, thanks a lot. It was one of the 22ohm resistors!
                      Set is up and running again!

                      *** HAPPY NEW YEAR TO ALL OF YOU ***

                        Comment

                        • Acosta_Brazil
                          New Member
                          • Jan 2017
                          • 1
                          • Brazil
                          #7
                          Re: LG 50PK550 turn on then off

                          Dear friends, I have uam TV LG 50PK550 with the following problem: When I turn on the TV, the screen blinks and turns off, but the TV does not turn off or goes into stand by.
                          I can measure all the voltages of the power supply and are perfectly ok, according to LG technical guide.
                          I was measuring the crystal oscillator of 54 MHZ with the oscilloscope and no signal. I changed the oscillator crystal and it did not work.
                          I disconnected the LVDS cable from TCon and closed the jumper next to the R51 and R52 resistors. The screen lit up perfectly and was self-test.
                          Anyone have any suggestions?
                          Could it be the BCM3556?

                            Comment

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