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    #61
    Re: lg tv 42lv450 does not start

    thank you very much for the advice, it will take 10 days to arrive, I will keep you informed. Thanks again

    Comment


      #62
      Re: lg tv 42lv450 does not start

      It should and I say it should work, I do not know much about TV, I usually repair consoles and notebooks, but if my theory is the right one the card in question, even if it has a different code should work, I extracted the software for the 2 tv:
      LG450A-ZC part number EAX64113202
      LG450U-ZC part number EAX64290501

      I passed them in hex editor is compared and to my amazement the 2 files are identical. attached photo,
      what do you think?
      is my theory right?
      Attached Files
      Last edited by Moddingscreen; 01-02-2018, 05:34 PM.

      Comment


        #63
        Re: lg tv 42lv450 does not start

        hello, I received the card that I ordered, I mounted it, the TV turns on, but the backlight turns on for 3 seconds and then goes away, with a flashlight I can see the image what can I do?

        Comment


          #64
          Re: lg tv 42lv450 does not start

          You may have originally had 2 separate problems. Now you have a Flash of the backlights and the screen is working so in this case I would only assume That either the power supply is not keeping the back lights live or you have a bad LED in one of the LED strips.

          Once again can you measure DRV on well the back lights come on in then turn off and tell us what the voltage is In both situations?

          Also well the backlights are on can you see any dark areas within the screen
          Did I leave the soldering iron on?

          Comment


            #65
            Re: lg tv 42lv450 does not start

            I removed the LCD panel up to the LEDs, I started the TV and all the LEDs light up, only one LED is less bright than the others may be the problem?
            Attached Files

            Comment


              #66
              Re: lg tv 42lv450 does not start

              the power supply delivers 36.7v on both led strips

              Comment


                #67
                Re: lg tv 42lv450 does not start

                In this case I would say that your back lighting seems OK Did you have a chance to look at that the DRV on signal?
                Did I leave the soldering iron on?

                Comment


                  #68
                  Re: lg tv 42lv450 does not start

                  it remains off

                  Comment


                    #69
                    Re: lg tv 42lv450 does not start

                    if I use the classic 12v LED strips?

                    Comment


                      #70
                      Re: lg tv 42lv450 does not start

                      Hmm ok. Maybe if there can chime in here, however I believe DRV on should control backlighting and that voltage should go high when backlights are requested to stay on.
                      Did I leave the soldering iron on?

                      Comment


                        #71
                        Re: lg tv 42lv450 does not start

                        DRV:
                        "it remains off" What does it mean? 0VDC? or not changing state?
                        DRV (BL-ON) should change state when TV is toggle on and off, <1VDC = 0FF, >2~2.5VDC = ON.
                        Last edited by budm; 01-08-2018, 10:15 PM.
                        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


                          #72
                          Re: lg tv 42lv450 does not start

                          how much I get home control, but it has happened to me a problem, a LED does not come on anymore. that bad luck, that's why I wanted to go for 12v strips
                          Last edited by Moddingscreen; 01-09-2018, 01:53 AM.

                          Comment


                            #73
                            Re: lg tv 42lv450 does not start

                            help me, I solved the problem of the backlight, I reassembled everything and I have the image upside down what I can do
                            Attached Files

                            Comment


                              #74
                              Re: lg tv 42lv450 does not start

                              So how did you solve the backlights problem?
                              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


                                #75
                                Re: lg tv 42lv450 does not start

                                I changed the entire right LED bar, and the power pcb, but how do I now turn the screen upside down?

                                Comment


                                  #76
                                  Re: lg tv 42lv450 does not start

                                  from these 2 menĂº I can not do anything?
                                  Attached Files

                                  Comment


                                    #77
                                    Re: lg tv 42lv450 does not start

                                    I thought it was the flash to give me problems on the screen, I tried to swap, but I always have the screen upside down
                                    Attached Files

                                    Comment


                                      #78
                                      Re: lg tv 42lv450 does not start

                                      This is not flash problem. This is eeprom issue. Do you have eeprom. Sop-8 style ic?
                                      Did I leave the soldering iron on?

                                      Comment


                                        #79
                                        Re: lg tv 42lv450 does not start

                                        this is all I swapped
                                        Attached Files

                                        Comment


                                          #80
                                          Re: lg tv 42lv450 does not start

                                          That's odd. What you changed should have been it.
                                          Did I leave the soldering iron on?

                                          Comment

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