LG 37" lcd tv won't respond to remote

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  • Meterman
    New Member
    • Sep 2013
    • 9
    • USA
    #1

    LG 37" lcd tv won't respond to remote

    Hello,
    I have an LG 37lc7d tv that won't respond to the remote control unless you insert a small headphones jack into the TV's "remote in" plug on the back panel. This usually does the trick until the next day, same problem again.

    Also, second problem (possibly related), when the tv does work, the "setup" screen will flash on & off which gets real annoying.

    Any ideas?

    Thanks!
    Tags: None
    • Caleb
      Smokin IC's
      • Feb 2013
      • 645
      • USA
      #2
      Re: LG 37" lcd tv won't respond to remote

      Sounds like the remote jack is shorting out to me, You would have to open the tv to see if it is easily dis-connectable to isolate.
      Liberating magic smoke one part at a time

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: LG 37" lcd tv won't respond to remote

          That is very common problem due to switching contacts inside the jack that select between the internal IR receiver and the External. You have spray a little contact cleaner inside the jack and insert the mini jack in-out bunch of times to clean the switch contacts.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • Meterman
              New Member
              • Sep 2013
              • 9
              • USA
              #4
              Re: LG 37" lcd tv won't respond to remote

              Thanks for responding, tried both suggestions, cannot disconnect the jack without desoldering it.
              Set worked until I shut it down for about an hour, now same problem but now it won't respond even if I plug in the mini jack.
              Possible I have a bad main board?
              Thanks.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: LG 37" lcd tv won't respond to remote

                  If you plug in the minijack then the front panel IR sensor will be disconnected, the jack is make for External IR receiver.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • Meterman
                      New Member
                      • Sep 2013
                      • 9
                      • USA
                      #6
                      Re: LG 37" lcd tv won't respond to remote

                      Sorry, I didn't leave the mini jack plugged in., I worked it in & out several times to try to clean it out. I also used contact cleaner. still no results.
                      Thanks

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: LG 37" lcd tv won't respond to remote

                          Shall we continue in this thread only?

                          3.4V is checked on the power board, you would need to disassemble the TV.

                          Since cleaner+mini jack worked once, I'd just try it again, it might be very contaminated.
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • Meterman
                              New Member
                              • Sep 2013
                              • 9
                              • USA
                              #8
                              Re: LG 37" lcd tv won't respond to remote

                              Thanks for the tips, set still won't work. Now it won't respond to panel controls either. I will be opening it up & testing for the 3.4 volts.
                              I swear I've had it opened up so many times that I'am gonna put snaps on the rear panel. If no 3.4 volts are found, what should I check next?
                              Thanks

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK
                                  #9
                                  Re: LG 37" lcd tv won't respond to remote

                                  Generally 3.4V will measure low on these sets e.g. 2.5V which causes a variety of problems.
                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

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