LG 47" 47LV4400 Shutting Off LV Series

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  • Acesales
    Senior Member
    • Jun 2017
    • 58
    • USA

    #1

    LG 47" 47LV4400 Shutting Off LV Series

    Hello again, my year 2011 47" LG 47LV4400-UA is now shutting off after a few minutes. Turns on and works fine then loses backlight, sound, and picture. Power light does not change, stays blue. I don't see a BGA processor to reflow like other LV series. Do the edge type processors also have cold solder joint problems or is this a different issue? Thanks
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  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12141
    • U.S.

    #2
    Re: LG 47" 47LV4400 Shutting Off LV Series

    Try this, for those few minutes it's on, go into picture menu-picture mode-backlights, turn them way down, then try the tv and see if it stays on longer.

    Comment

    • Acesales
      Senior Member
      • Jun 2017
      • 58
      • USA

      #3
      Re: LG 47" 47LV4400 Shutting Off LV Series

      Ok, I was able to go in and turn brightness and backlight all the way to zero. It still shut off right away, seems like it's getting worse.

      Comment

      • nomoresonys
        Badcaps Legend
        • Jan 2013
        • 12141
        • U.S.

        #4
        Re: LG 47" 47LV4400 Shutting Off LV Series

        Try heating the electrolytic capacitors with a hairdryer for a few minutes, then try it while it's still hot, if no difference, check the bottom of board for anything obvious, check those solder joints, can search images of bad solder joints, sometimes the bad ones can be tricky to see but I guess mostly they will be cracked looking.

        Comment

        • Acesales
          Senior Member
          • Jun 2017
          • 58
          • USA

          #5
          Re: LG 47" 47LV4400 Shutting Off LV Series

          Do you mean electrolytics on the main board or the power supply board? Thanks

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12141
            • U.S.

            #6
            Re: LG 47" 47LV4400 Shutting Off LV Series

            Try powerboard first, no joy, try mainboard, it's just a little test that will bring the esr of a bad cap down just enough to let tv work for a bit if the cap isn't too far gone. Need to try it while it's still hot.
            Last edited by nomoresonys; 10-24-2023, 11:57 PM.

            Comment

            • Davi.p
              Hobbist Tech
              • Sep 2009
              • 4316
              • Italy - Milan

              #7
              Re: LG 47" 47LV4400 Shutting Off LV Series

              Examine with microscope or power magnifier the solderings of main processor

              Comment

              • Acesales
                Senior Member
                • Jun 2017
                • 58
                • USA

                #8
                Re: LG 47" 47LV4400 Shutting Off LV Series

                I heated the electrolytics on the power board and it came back to life! It ran for five minutes then the wife said we have to leave so I turned it off. I tried heating them again and it won't stay working this time. Was heating them to lower the ESR a one time only test or was it all coincidence?

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12141
                  • U.S.

                  #9
                  Re: LG 47" 47LV4400 Shutting Off LV Series

                  It's kind of hard to tell, I think I would switch out those electrolytics, they've been working hard for 12 years, even if it don't fix it, it will eliminate them from being the culprit.

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12141
                    • U.S.

                    #10
                    Re: LG 47" 47LV4400 Shutting Off LV Series

                    If you don't want to change them all, maybe start with those 5 by the connectors.

                    Comment

                    • EazyBone
                      Badcaps Legend
                      • Jun 2023
                      • 1318
                      • United states

                      #11
                      Re: LG 47" 47LV4400 Shutting Off LV Series

                      I've seen you suggest the heating many times and first post I've seen work so far. Pretty cool. Curious to see results here. Post if you fix

                      Comment

                      • Davi.p
                        Hobbist Tech
                        • Sep 2009
                        • 4316
                        • Italy - Milan

                        #12
                        Re: LG 47" 47LV4400 Shutting Off LV Series

                        I suggest to not replace any cap cause Delta brand uses best brands caps, here probably Nichicon, the test of haidryer has no evidence here, you probably are a newbie and end to replace with s**t caps, you can try to heat the cpu but an hairdyer is not enough for me , you need an air soldering station or heat gun

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12141
                          • U.S.

                          #13
                          Re: LG 47" 47LV4400 Shutting Off LV Series

                          Some know it alls don't know shit, EVEN the best caps wear out and die.

                          Comment

                          • nomoresonys
                            Badcaps Legend
                            • Jan 2013
                            • 12141
                            • U.S.

                            #14
                            Re: LG 47" 47LV4400 Shutting Off LV Series

                            Originally posted by EazyBone
                            I've seen you suggest the heating many times and first post I've seen work so far. Pretty cool. Curious to see results here. Post if you fix
                            You haven't been here long, that's an old test that's been working for a very long time.

                            Comment

                            • nomoresonys
                              Badcaps Legend
                              • Jan 2013
                              • 12141
                              • U.S.

                              #15
                              Re: LG 47" 47LV4400 Shutting Off LV Series

                              I didn't say take the caps out and throw them away, you don't have a cap tester, so I suggested replacing those 5 and see if it works, you can always put the other caps back in but why would you if you replaced them with quality 105 low esr caps. You would have to ask the "expert" that said don't replace them, lol.

                              Comment

                              • Acesales
                                Senior Member
                                • Jun 2017
                                • 58
                                • USA

                                #16
                                Re: LG 47" 47LV4400 Shutting Off LV Series

                                I reflowed most all of the through hole components on the power supply board. TV worked for about 25 minutes and shut off again. I'll look at replacing the electrolytics now.

                                Comment

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