Toshiba 40D1333B no back light.

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #41
    Re: Toshiba 40D1333B no back light.

    Pictures are TOO BLURR for me to trace out the circuit of the LED driver section.
    Need straight clear shot pictures of the whole bottom side of this power supply/LED driver board.
    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

    • riget
      Senior Member
      • Sep 2011
      • 66
      • UK

      #42
      Re: Toshiba 40D1333B no back light.

      Originally posted by budm
      Pictures are TOO BLURR for me to trace out the circuit of the LED driver section.
      Need straight clear shot pictures of the whole bottom side of this power supply/LED driver board.
      Hope these are better?
      Attached Files

      Comment

      • riget
        Senior Member
        • Sep 2011
        • 66
        • UK

        #43
        Re: Toshiba 40D1333B no back light.

        Found this,
        Attached Files

        Comment

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

          #44
          Re: Toshiba 40D1333B no back light.

          So you are 101% sure its not the leds ? Have you checked the diode for the 24V rail and the mosfet that switches the voltage for the leds ?
          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/

          Comment

          • riget
            Senior Member
            • Sep 2011
            • 66
            • UK

            #45
            Re: Toshiba 40D1333B no back light.

            It's not the leds, I've got 24v going to the main board, don't know what diode/mosfet you mean.

            Comment

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

              #46
              Re: Toshiba 40D1333B no back light.

              Right so you have 24v going to the mainboard so guess that the 24v is working. What about going to the leds ?
              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/

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #47
                Re: Toshiba 40D1333B no back light.

                OK, so do you have the 24-80VDC at the two legs of the C316?
                Did you verify that you do have BL-ON signal?
                Last edited by budm; 08-08-2015, 04:58 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

                • riget
                  Senior Member
                  • Sep 2011
                  • 66
                  • UK

                  #48
                  Re: Toshiba 40D1333B no back light.

                  In standby I have 0v at the led connector, 1.4v at c505 and 1.7v at c316
                  when turned on I get 2v at led, 2v at c505 and 2.3v at c316

                  Thanks.

                  Comment

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

                    #49
                    Re: Toshiba 40D1333B no back light.

                    Hi all. I have the same board as riget and I get 2v going to the panel. I have pulled the panel a part and saw only strips. No led driver so I assume it's on the psu? Where?
                    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

                      #50
                      Re: Toshiba 40D1333B no back light.

                      Originally posted by budm
                      OK, so do you have the 24-80VDC at the two legs of the C316?
                      Did you verify that you do have BL-ON signal?
                      I have 2v at mine.
                      Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                      Comment

                      • riget
                        Senior Member
                        • Sep 2011
                        • 66
                        • UK

                        #51
                        Re: Toshiba 40D1333B no back light.

                        Originally posted by speedypro
                        Hi all. I have the same board as riget and I get 2v going to the panel. I have pulled the panel a part and saw only strips. No led driver so I assume it's on the psu? Where?
                        Hi, I managed to fix mine, it was a cap that took a transistor out, I can look up the numbers if you want to give it a go.

                        Comment

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

                          #52
                          Re: Toshiba 40D1333B no back light.

                          Originally posted by riget
                          Hi, I managed to fix mine, it was a cap that took a transistor out, I can look up the numbers if you want to give it a go.
                          Yes please! My hands are already dirty. Or a picture of what you have replaced is perfect. Either.
                          Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                          Comment

                          • riget
                            Senior Member
                            • Sep 2011
                            • 66
                            • UK

                            #53
                            Re: Toshiba 40D1333B no back light.

                            Ok sorry it's late, the transistor is the one on the first pic of the top, top right hand side next to the heatsink, the smd cap is underneath near to it c525.

                            Thanks.

                            Comment

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

                              #54
                              Re: Toshiba 40D1333B no back light.

                              Originally posted by riget
                              Ok sorry it's late, the transistor is the one on the first pic of the top, top right hand side next to the heatsink, the smd cap is underneath near to it c525.

                              Thanks.
                              is the transistor q216 or the mosfet q301? im lost, sorry.
                              Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                              Comment

                              • riget
                                Senior Member
                                • Sep 2011
                                • 66
                                • UK

                                #55
                                Re: Toshiba 40D1333B no back light.

                                yes q216

                                Comment

                                • cossiejay
                                  Senior Member
                                  • Nov 2010
                                  • 83

                                  #56
                                  Re: Toshiba 40D1333B no back light.

                                  do you have the part numbers please I have same fault only 0 volts going to leds

                                  Comment

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

                                    #57
                                    Re: Toshiba 40D1333B no back light.

                                    Look at the mosfets lol they have the PN on them.
                                    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/

                                    Comment

                                    • michael dranfield
                                      Badcaps Veteran
                                      • Jan 2016
                                      • 232
                                      • England

                                      #58
                                      Re: Toshiba 40D1333B no back light.

                                      You see inside the panel there are two strips connected together in the middle by a plug and socket, look at the ones that have gone brown , there are dry Jointed, link each one together with a bit of wire.

                                      Comment

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

                                        #59
                                        Re: Toshiba 40D1333B no back light.

                                        Michael he has no volts going to the Leds meaning that the driver is dead. If he has 24v going to them (not boosted) the Leds would be bad.
                                        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/

                                        Comment

                                        • michael dranfield
                                          Badcaps Veteran
                                          • Jan 2016
                                          • 232
                                          • England

                                          #60
                                          Re: Toshiba 40D1333B no back light.

                                          The driver is in the screen itself, there is a fuse on this board .

                                          Comment

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