[Help] LG 49LH570T Random Shutdowns

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  • manubali
    Member
    • Feb 2017
    • 22
    • New Zealand
    #1

    [Help] LG 49LH570T Random Shutdowns

    Hi, i was wondering if anyone can help me troubleshoot LG 49LH570T tv, initially it came for no power issue, but after leaving everything unplugged overnight, it started working in the morning when i was about to start diagnostics process.
    It will turn on for 10 minutes and will die afterwards, and when i try to turn it on, a solid red LED will come up for few seconds, followed by two short blinks and then it completely shutdown, i have examined power supply and main board for visible damage or shorts, but its all fine.
    The power supply PCB number is EAX66851401 REV 1.0.
    One thing that i have noticed is that PSU makes hissing noise constantly
    Attached Files
    Last edited by manubali; 09-21-2023, 06:58 PM.
    Tags: None
    • Storyteller12
      Badcaps Veteran
      • Jun 2020
      • 624
      • USA
      #2
      Re: [Help] LG 49LH570T Random Shutdowns

      Sounds like the caps may be bad. You can try heating them with a hair dryer next time it won’t turn on and see if it works Or if you have esr tester

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12145
          • U.S.
          #3
          Re: [Help] LG 49LH570T Random Shutdowns

          Look over the solder joints of powerboard very closely, reflow any that look suspect just in case, can search bad solder joints to see images if needed.
          Last edited by nomoresonys; 09-21-2023, 07:14 PM.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12145
              • U.S.
              #4
              Re: [Help] LG 49LH570T Random Shutdowns

              Originally posted by Storyteller12
              Sounds like the caps may be bad. You can try heating them with a hair dryer next time it won't turn on and see if it works Or if you have esr tester
              +10, heat m up see if tv stays on longer.

                Comment

                • manubali
                  Member
                  • Feb 2017
                  • 22
                  • New Zealand
                  #5
                  Re: [Help] LG 49LH570T Random Shutdowns

                  Fixed, After checking for cold/broken solder joints and hair dryer method, i focused on main board, and reflowing XD engine (LGE2111A-T8) BGA chip fixed the issue.
                  Thanks everyone.
                  Last edited by manubali; 09-21-2023, 11:21 PM.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12145
                      • U.S.
                      #6
                      Re: [Help] LG 49LH570T Random Shutdowns

                      Glasd to hear it, if you can get a fan blowing on your bga it will last a lot longer.

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