JVC Model: JLC37BC3002 - Backlight not working

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA
    #21
    Re: JVC Model: JLC37BC3002 - Backlight not working

    At since point since you did test the power supply/inverter board by itself using force on with resistors but still no backlights then you do have power supply board problem.
    VBR missing is the main board 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

      • kyrinth021883
        Member
        • Sep 2013
        • 40
        • US
        #22
        Re: JVC Model: JLC37BC3002 - Backlight not working

        Ok, that's what I was wanting to hear from the experts I will search for a new board. Thanks a bunch for the great help! Will update once I get a new one.

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales
            #23
            Re: JVC Model: JLC37BC3002 - Backlight not working

            It certainly looks as Budm says. Out of curiosity what was the Status voltage when you had jumped all three points? From the link in an earlier post given on this thread, when the set was displaying the logo
            VBR_B - 3.22V
            Status - 0.0V

            I suspect that the Status voltage (3.06V) is at fault condition and as a result disabling VBR_B
            Last edited by dick_barton; 10-14-2017, 04:47 PM.
            Willing to help but I'm no expert.

              Comment

              • kyrinth021883
                Member
                • Sep 2013
                • 40
                • US
                #24
                Re: JVC Model: JLC37BC3002 - Backlight not working

                Its was STATUS - 3.31, same as before (also get all 3 12VDCs)

                  Comment

                  • Dumah Brazorf
                    Senior Member
                    • Jun 2013
                    • 179
                    • Italy
                    #25
                    Re: JVC Model: JLC37BC3002 - Backlight not working

                    Originally posted by kyrinth021883
                    When first turned on, i think I see some faint blue-ish light from the top left corner (looking at the back) through some of the holes in the metal backplate. But this only lasts a second or two. Can't tell if this is the backlighting trying to fire off, or something else.
                    Did not notice that in the first post.
                    It may be a bad cfl lamp arching.

                      Comment

                      • kyrinth021883
                        Member
                        • Sep 2013
                        • 40
                        • US
                        #26
                        Re: JVC Model: JLC37BC3002 - Backlight not working

                        Originally posted by Dumah Brazorf
                        Did not notice that in the first post.
                        It may be a bad cfl lamp arching.
                        No, it is definitely blue LED lights. the one under the PS/Inverter board I can actually see the when I look under it. The light in the top corner is the same light and they both light and fade out the same together. Plus if there were arcing and such, i think I would hear it and it would look a lot different lol.

                          Comment

                          • nsilvang
                            Member
                            • Mar 2017
                            • 26
                            • mexico
                            #27
                            Re: JVC Model: JLC37BC3002 - Backlight not working

                            i need the bios dump for this tv jlc37bc3002

                              Comment

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