JVC lt-42em73 Flashing Backlights

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  • JunkmanJimbo
    Senior Member
    • Mar 2017
    • 192
    • United States

    #1

    JVC lt-42em73 Flashing Backlights

    First I replaced the backlights. Then I found three bulging capacitors, one leaking, on the power supply board. Now, when I turn on the tv, the picture flashes with an image and then the picture goes away. I can unplug the tv and plug it back in, turn it on and the same thing happens. Please help. Thanks!
  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #2
    Re: JVC lt-42em73 Flashing Backlights

    Do you still have backlights?
    I assume no responsibility for any stupid suggestions I might post.

    Comment

    • JunkmanJimbo
      Senior Member
      • Mar 2017
      • 192
      • United States

      #3
      Re: JVC lt-42em73 Flashing Backlights

      After the backlights are on and flashing for a short time, they go out. I can unplug the power cord and plug it back in and it will do the same thing.

      Comment

      • comptek
        Badcaps Veteran
        • Aug 2013
        • 606
        • uk

        #4
        Re: JVC lt-42em73 Flashing Backlights

        Check your soldering work on the psu,
        If it’s a vestel base unit check where the back lights plug in they’re called fingers just wet them with a tiny amount of solder and plug the strips back in hope this makes sense

        Comment

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

          #5
          Re: JVC lt-42em73 Flashing Backlights

          Did you test the new backlights before installation?

          Comment

          • JunkmanJimbo
            Senior Member
            • Mar 2017
            • 192
            • United States

            #6
            Re: JVC lt-42em73 Flashing Backlights

            I checked the solder at the backlight plugs and they are fine. I disassembled the tv again and checked the backlights again. Removed everything down to the backlights, plugged in the tv and the backlights will flash once and go out. I tried another set of good backlights and they wouldn't even come on at all. So at this point I believe the problem is the power supply board. As I mentioned earlier, I replaced some bulging caps but apparently there's something else wrong with it. Sorry for the delay in responding but I haven't had the time to mess with the tv. Any ideas? Thanks in advance!

            Comment

            • diif
              Badcaps Legend
              • Feb 2014
              • 6978
              • England

              #7
              Re: JVC lt-42em73 Flashing Backlights

              You only replaced the visibly bulging caps ? There's a good chance more have failed and need replacing.

              Comment

              • JunkmanJimbo
                Senior Member
                • Mar 2017
                • 192
                • United States

                #8
                Re: JVC lt-42em73 Flashing Backlights

                You're probably right. This board has vent capacitors with no value listed on them. How can I determine the value of these capacitors?

                Comment

                • diif
                  Badcaps Legend
                  • Feb 2014
                  • 6978
                  • England

                  #9
                  Re: JVC lt-42em73 Flashing Backlights

                  How did you identify the bulging caps previously ?

                  Comment

                  • JunkmanJimbo
                    Senior Member
                    • Mar 2017
                    • 192
                    • United States

                    #10
                    Re: JVC lt-42em73 Flashing Backlights

                    The capacitors I replaced had the value printed on them. Only the vent caps don't have a value.

                    Comment

                    • diif
                      Badcaps Legend
                      • Feb 2014
                      • 6978
                      • England

                      #11
                      Re: JVC lt-42em73 Flashing Backlights

                      Have you removed one and had a look all the way around ?

                      Comment

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

                        #12
                        Re: JVC lt-42em73 Flashing Backlights

                        get out the hairdryer and heat all those caps, then see if the tv stays on longer, if it does you can narrow down the culprit with more selective heating.

                        Comment

                        • JunkmanJimbo
                          Senior Member
                          • Mar 2017
                          • 192
                          • United States

                          #13
                          Re: JVC lt-42em73 Flashing Backlights

                          Will do. Thank you. I will let you know what happens.

                          Comment

                          • JunkmanJimbo
                            Senior Member
                            • Mar 2017
                            • 192
                            • United States

                            #14
                            Re: JVC lt-42em73 Flashing Backlights

                            Originally posted by nomoresonys
                            get out the hairdryer and heat all those caps, then see if the tv stays on longer, if it does you can narrow down the culprit with more selective heating.
                            I actually found a power supply board at a good price. I received the board yesterday and that fixed the problem. Thank you to all of you for the help!

                            Comment

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

                              #15
                              Re: JVC lt-42em73 Flashing Backlights

                              glad to hear it,

                              Comment

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