Toshiba 42x3030D - No Display, no Backlight

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  • speedypro
    Badcaps Veteran
    • Feb 2013
    • 561
    • United Kingdom

    #1

    Toshiba 42x3030D - No Display, no Backlight

    I thought the tcon was the issue but on more digging, I feel there is an issue with the inverters. Come to think of it, I've never tested these before. I got 24v going to the inverters (both) but testing the pink and white wires, I get 0v - 5vdc. Should I see a higher volts on all points?

    My inverter is not the same as this post.



    Is the inverter bad? What goes bad on these? The transformers themselves?
    Attached Files
    Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: Toshiba 42x3030D - No Display, no Backlight

    First of all big fail ! Never ever use your meter to measure the ccfl outputs it will blow it up if you did and the set/inverter intermittently come on lol Second what voltage is on the other side of each fuse ?
    Last edited by ReeceyBurger123; 08-20-2016, 05:25 AM.
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

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    • speedypro
      Badcaps Veteran
      • Feb 2013
      • 561
      • United Kingdom

      #3
      Re: Toshiba 42x3030D - No Display, no Backlight

      Originally posted by ReeceyBurger123
      First of all big fail ! Never ever use your meter to measure the ccfl outputs it will blow it up if you did and the set/inverter intermittently come on lol Second what voltage is on the other side of each fuse ?
      Oh!!!

      Other side of fuse, same 24vdc.
      Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 7964
        • Canada

        #4
        Re: Toshiba 42x3030D - No Display, no Backlight

        Like Reecey already said: DO NOT measure the pink and white cables, or any of the CCFL output, while running with the DMM on.

        Does the backlight come on at all (for like 2 seconds)? Can you explain exactly what your TV does or doesn't do?

        In order to check the transformers, compare the secondary's on each transformer output with the TV off and DMM in Ohms mode. If you find that one or more transformers are out more than 3%, then it is bad.

        Comment

        • speedypro
          Badcaps Veteran
          • Feb 2013
          • 561
          • United Kingdom

          #5
          Re: Toshiba 42x3030D - No Display, no Backlight

          Ok more news. Bought two used inverters off ebay, assumed they are working, but same issue; no backlight, no slight flash of light? CCFL needs replacing?
          Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

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          • vinceroger69
            Badcaps Legend
            • Mar 2012
            • 6714
            • uk

            #6
            Re: Toshiba 42x3030D - No Display, no Backlight

            maybe check some of the voltages this thread should help
            https://www.badcaps.net/forum/showth...light=42x3030D

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 7964
              • Canada

              #7
              Re: Toshiba 42x3030D - No Display, no Backlight

              Check if your main board is turning on the inverter (BLon).

              Comment

              • speedypro
                Badcaps Veteran
                • Feb 2013
                • 561
                • United Kingdom

                #8
                Re: Toshiba 42x3030D - No Display, no Backlight

                Originally posted by CapLeaker
                Check if your main board is turning on the inverter (BLon).
                I thought getting 24v it's all ok. No? How to test that?
                Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                Comment

                • speedypro
                  Badcaps Veteran
                  • Feb 2013
                  • 561
                  • United Kingdom

                  #9
                  Re: Toshiba 42x3030D - No Display, no Backlight

                  Never mind! Made a silly mistake. The bought inverters do work. I've missed a cable that goes to the main board and all is well.
                  Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                  Comment

                  • vinceroger69
                    Badcaps Legend
                    • Mar 2012
                    • 6714
                    • uk

                    #10
                    Re: Toshiba 42x3030D - No Display, no Backlight

                    Originally posted by speedypro
                    Never mind! Made a silly mistake. The bought inverters do work. I've missed a cable that goes to the main board and all is well.
                    Glad you managed to find and fix the fault we have all made little mistakes like that before but the main thing is the tvs fixed.

                    Comment

                    • ReeceyBurger123
                      Never Give Up !
                      • May 2014
                      • 7325
                      • Britain

                      #11
                      Re: Toshiba 42x3030D - No Display, no Backlight

                      Lol good to hear its going again, now you realize (hopefully) why its important to diagnose not throw boards at something
                      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                      https://www.facebook.com/Telford-Tel...7894576335359/

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