LG DU-37LZ30 LCD TV Shuts off after an hour

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  • 120volts
    Senior Member
    • Oct 2013
    • 57
    • USA
    #1

    LG DU-37LZ30 LCD TV Shuts off after an hour

    TV Shuts off after an hour
    No sings of bad caps
    Heat sinks get pretty hot on the power supply
    A couple of the caps get warm


    Any help is greatly appreciated.
    Dan "TV Tinkerer"
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LG DU-37LZ30 LCD TV Shuts off after an hour

      Warm stuff up with a hairdryer slowly. If it shuts off quicker when warming an area you have found the fault.
      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

        • 120volts
          Senior Member
          • Oct 2013
          • 57
          • USA
          #3
          Re: LG DU-37LZ30 LCD TV Shuts off after an hour

          Sounds like a good idea
          Dan "TV Tinkerer"

            Comment

            • 120volts
              Senior Member
              • Oct 2013
              • 57
              • USA
              #4
              Re: LG DU-37LZ30 LCD TV Shuts off after an hour

              OK I usually hate to modify Stuff to get working "BUT"
              This TV was shutting after an hour and I found that the power supply heat sinks were just about to hot to touch.
              I ended up putting two computer fans in parallel to equal 24V and connected them to the back-light supply.


              Now the power supply runs quite cool and the TV doesn't shut down
              Dan "TV Tinkerer"

                Comment

                • ben7
                  Capaholic
                  • Jan 2011
                  • 4059
                  • USA
                  #5
                  Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                  Interesting. I wonder if this is a design defect?!
                  Muh-soggy-knee

                    Comment

                    • truep
                      Badcaps Veteran
                      • Aug 2010
                      • 373
                      • USA
                      #6
                      Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                      Leaking caps can cause overheating. I would change all of those above the top heat sink. Use Panasonic fm, or FC 105C caps from digikey. If for no other reason than to be safe.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                          Adding fans is just likely to prolong the time till failure, it will probably stop working eventually.
                          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

                            • vinceroger69
                              Badcaps Legend
                              • Mar 2012
                              • 6714
                              • uk
                              #8
                              Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                              in post 4 the yellow transformer to the right at the top the capacitor behind that looks like its been subject to heat and the outer plastic cover of the capacitor has shrunk those capacitors maybe your issue post 1 is a shopjimmy image edit truep beat me to it lol
                              Last edited by vinceroger69; 12-07-2013, 11:47 AM.

                                Comment

                                • 102mm
                                  Senior Member
                                  • Dec 2013
                                  • 181
                                  • us
                                  #9
                                  Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                                  I have this same model. The standby voltage is pulsating between 2 and 4 four volts on the power supply. Matter fact, any voltage I measure pulsates on the power supply. Anyone have a clue?
                                  Craigslist Picks & Fixes

                                  2 ea - Samsung 52"
                                  Samsung 60"

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA
                                      #10
                                      Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                                      Originally posted by 102mm
                                      I have this same model. The standby voltage is pulsating between 2 and 4 four volts on the power supply. Matter fact, any voltage I measure pulsates on the power supply. Anyone have a clue?
                                      Bad start up cap in the STBY power supply? Too much load being drawn from the power supply?
                                      How board good clear pictures of YOUR board?
                                      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

                                        • saddle_au
                                          Waste Warrior
                                          • Jan 2013
                                          • 121
                                          • Australia
                                          #11
                                          Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                                          The caps above the transformer on the right (in upper middle of image ) don't look healthy.

                                            Comment

                                            • vinceroger69
                                              Badcaps Legend
                                              • Mar 2012
                                              • 6714
                                              • uk
                                              #12
                                              Re: LG DU-37LZ30 LCD TV Shuts off after an hour

                                              Originally posted by saddle_au
                                              The caps above the transformer on the right (in upper middle of image ) don't look healthy.
                                              thats not his picture thats the original poster this user only joined the thread in post nine.

                                                Comment

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