LG NB4530A soundbar abruptly powering off

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  • dlxmax
    New Member
    • Jul 2021
    • 4
    • South Korea
    #1

    LG NB4530A soundbar abruptly powering off

    I've had my LG NB4530A soundbar for 7 years.
    It's been great up until the past few days.

    After playing sound for about 30 minutes it now shuts off abruptly.
    There's no "GOODBYE" message on the LCD, and the standby light doesn't illuminate.
    However, I can turn it right back on, but it will only stay on for minutes (or less) before dying again.

    I'm looking at the service manual (attached) and there isn't a section addressing this kind of issue.
    I do have a multimeter, and a rework station, but no oscilloscope.
    I've already removed the mainboard for testing. I just don't know where to start looking.

    Where would you begin testing?
    Thanks for your ideas!

    I strive to prevent e-waste as much as possible!
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    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England
      #2
      Re: LG NB4530A soundbar abruptly powering off

      After 7 years, any electrolytic capacitors, also check for possible dry joints.

        Comment

        • dlxmax
          New Member
          • Jul 2021
          • 4
          • South Korea
          #3
          Re: LG NB4530A soundbar abruptly powering off

          I checked some of the caps in the hottest area and they measured within spec, and I didn't spot any dry joints. I reached out to LG here in Korea about getting a replacement mainboard and they wouldn't sell me one, but they apparently still service this model so I set about putting it back together. And now it works just fine.

          Since it was exhibiting the problem on my test bench before disassembly, possibly one of the ribbon cables or plugs needed reseating. Or maybe the gremlins departed when the case was opened? lol

            Comment

            • Th3_uN1Qu3
              Believe in
              • Jul 2010
              • 6031
              • Romania
              #4
              Re: LG NB4530A soundbar abruptly powering off

              Reminds me of the free 42" LG plasma I got from a shop. Apparently it would shut down after a few minutes. All I did was take the back off and blow the dead roaches off the sustain boards. Plugged it in and it never turned off by itself since.
              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

                • madan1
                  Badcaps Veteran
                  • Nov 2016
                  • 721
                  • Bulgaria
                  #5
                  Re: LG NB4530A soundbar abruptly powering off

                  Is there a heatsink on TAS5612LADDVR / ic701? If yes, change the thermal paste.

                    Comment

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