LG 55LN5700 reboots

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  • sirentech
    New Member
    • Apr 2021
    • 8
    • USA
    #1

    LG 55LN5700 reboots

    Of course, worked great for a period of time! Before it could run for any period of time and then will reboot itself. It did not want to shut itself off a few times, so I had to pull the power plug. Now lucky to get 1 minute of video then reboots.
    Drops out too fast to get some voltage readings.
    Have worked on many brands before but not familiar with this problem from LG. Thinking either the BG soldered main chip is in need of reseating or perhaps an Eprom failure. Main board failure or entirely wrong-LEDS??
    Main chip doesn't get hot enough to shut it down.
    Have not dug into the LED driver yet or tested the strips with an external tester.
    Thank you for any help you may offer.

    I inadvertently sent this same post to the Capacitor forum. Sorry for the inconvenience.
    Tags: None
    • neilc6
      Badcaps Legend
      • Nov 2015
      • 1550
      • Canada
      #2
      Re: LG 55LN5700 reboots

      LN series suffers from backlight failures but they just shut down into protection mode since no error signal is sent to the main board. TV will be on with no backlight. If your supply voltages are stable, main board is suspect. Have not encountered BGA issues on this model either.
      Last edited by neilc6; 10-30-2022, 04:54 PM.

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12206
          • U.S.
          #3
          Re: LG 55LN5700 reboots

          can you post a good clear picture of each board and one of the whole back as to see how everything is connected.
          Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12206
              • U.S.
              #4
              Re: LG 55LN5700 reboots

              with tv unplugged from power, unhook cable from tcon to mainboard, leave it off, plug power cord back in, see if tv stays on, will be no picture of course.
              Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.

                Comment

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