? on turning a tv back-light into a sighn

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  • slee95
    Member
    • Jan 2014
    • 14
    • usa
    #1

    ? on turning a tv back-light into a sighn

    I was wondering what voltage would turn on the florescent tubes, there's 8 of them.
    I found a tv on the curb and it worked but the lcd screen was cracked so I thought to use the back-light as a sign.
    Tags: None
    • goontron
      5000!
      • Dec 2011
      • 4108
      • US
      #2
      Re: ? on turning a tv back-light into a sighn

      its very dependent of the TV, but i have done it before! well it wasnt for a sign, it was for something that became legal this year in Colorado.
      anyway, with the one i did it with you had to have a load resistor on the 12v rail, 5vstby to the PSU on wire, the BL_ON wire and the DIM wire on the 5v rail just to upstart the backlight.
      it is hard, but not impossible.
      so, what make and model is this tv?
      Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

      "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

      Excuse me while i do something dangerous


      You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

      Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

      Follow the white rabbit.

        Comment

        • slee95
          Member
          • Jan 2014
          • 14
          • usa
          #3
          Re: ? on turning a tv back-light into a sighn

          Forgot model tv it was but it was a insignia tv.

            Comment

            • tron
              Member
              • Apr 2009
              • 47
              #4
              Re: ? on turning a tv back-light into a sighn

              http://www.youtube.com/watch?v=gPpy-HX9wFg

                Comment

                • slee95
                  Member
                  • Jan 2014
                  • 14
                  • usa
                  #5
                  Re: ? on turning a tv back-light into a sighn

                  I didn't think to keep the boards in the tv and recycled them oops There is a board in the back light and kept that. Does the back light run on ac or dc?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: ? on turning a tv back-light into a sighn

                      It typically runs on about 1000VAC at around 50 to 60kHz.
                      Did you keep the little board that drives the backlights?
                      Why would you scrap the boards anyway - they are valuable!
                      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

                        • multimeter
                          Badcaps Veteran
                          • Jan 2011
                          • 739
                          • united kingdom
                          #7
                          Re: ? on turning a tv back-light into a sighn

                          i knocked one up out of an old 19"hp monitor,ripped most of the screen out.

                          i use it for putting boards on,not only can you see the traces for testing without flipping the board,it shows up any cracks in the traces also.
                          fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                          ----------------------------------------------
                          please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                            Comment

                            • slee95
                              Member
                              • Jan 2014
                              • 14
                              • usa
                              #8
                              Re: ? on turning a tv back-light into a sighn

                              The board to the tubes i have it's attached to the the tubes. There 8 tubes and on the board appears to be 8 transformers .

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA
                                  #9
                                  Re: ? on turning a tv back-light into a sighn

                                  Sounds like you have the inverter board but not the power supply board to run it.
                                  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

                                    • slee95
                                      Member
                                      • Jan 2014
                                      • 14
                                      • usa
                                      #10
                                      Re: ? on turning a tv back-light into a sighn

                                      How much power do I apply to the inverter board to power the lights? Could I take out the board and apply power straight to the tubes?

                                        Comment

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