toshiba 42tl515u problems

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  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12086
    • U.S.

    #21
    Re: toshiba 42tl515u problems

    Maybe you can test some components on the mainboard, might just be a 2 dollar part needed?

    Comment

    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12086
      • U.S.

      #22
      Re: toshiba 42tl515u problems

      A few repair services on ebay, they want about 100 bucks.
      Last edited by nomoresonys; 11-25-2018, 05:09 PM.

      Comment

      • doesntmind
        Senior Member
        • Feb 2014
        • 61
        • usa

        #23
        Re: toshiba 42tl515u problems

        Originally posted by nomoresonys
        A few repair services on ebay, they want about 100 bucks, seems pricey.
        Thank you so much for your help! Do you know where I might be able to find a service manual on this so I can get a better idea on fixing the mainboard?

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12086
          • U.S.

          #24
          Re: toshiba 42tl515u problems

          I believe the member here named nickstvs does repair service, not sure tho, you would have to check with him, if you want.

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12086
            • U.S.

            #25
            Re: toshiba 42tl515u problems

            Some use this site. https://elektrotanya.com/
            Last edited by nomoresonys; 11-25-2018, 05:27 PM.

            Comment

            • doesntmind
              Senior Member
              • Feb 2014
              • 61
              • usa

              #26
              Re: toshiba 42tl515u problems

              Originally posted by nomoresonys
              Some use this site. https://elektrotanya.com/
              Thank you for this resource, I wasnt able to find my boards manual but I will keep this in bookmarks.

              So far I have been able to trace the BL_ONOFF to the collector pin of LY Q1001 on back side of board. Do you think I should attempt applying heat on the board for a bit in case it just needs reflow? any tips or suggestions?
              Last edited by doesntmind; 11-25-2018, 05:35 PM.

              Comment

              • nomoresonys
                Badcaps Legend
                • Jan 2013
                • 12086
                • U.S.

                #27
                Re: toshiba 42tl515u problems

                Hmmm, there looks like a lot of tiny components on the back, myself I would be worried I would lose some of them by applying too much heat, you might be right tho, not sure? there may be a way to test the components first without adding heat, to see if they are in working order.
                Last edited by nomoresonys; 11-25-2018, 05:52 PM.

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12086
                  • U.S.

                  #28
                  Re: toshiba 42tl515u problems

                  Might be a test procedure for LY Q1001.

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12086
                    • U.S.

                    #29
                    Re: toshiba 42tl515u problems

                    It's a transistor, you can check youtube for transistor testing, some videos are better than others of course.

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9532
                      • Canada

                      #30
                      Re: toshiba 42tl515u problems

                      The transistor marked LY is a 2SC2712-Y, easy to check with a meter on diode test

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: toshiba 42tl515u problems

                        Report the Voltages of all 3 pins with ref to gnd when TV is OFF and when power switch is activated.
                        Bur at this point you have more than just he BL-ON. Do you have PWM Dimming control signal?
                        Do you have 12VDC feeding the T-CON?
                        Last edited by budm; 11-28-2018, 05:01 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

                        • doesntmind
                          Senior Member
                          • Feb 2014
                          • 61
                          • usa

                          #32
                          Re: toshiba 42tl515u problems

                          Originally posted by budm
                          Report the Voltages of all 3 pins with ref to gnd when TV is OFF and when power switch is activated.
                          Bur at this point you have more than just he BL-ON. Do you have PWM Dimming control signal?
                          Do you have 12VDC feeding the T-CON?
                          I have 164mV at PWM pin

                          the emitter pin on both transisters are connected.
                          the base of q1001 goes to a 10k resistor then collector of q1002.
                          the base of q1002 goes to a 4.7k resistor then to both emitter pins.

                          Q1001
                          pin - desc - standby - reading
                          1 - base - 0 - 700mV
                          2 - emitter - 0 - 5mV
                          3 - collector - 0 - 24mV

                          Q1002
                          1 - base - 0 - 6.2mv
                          2 - emitter - 0 - 6.2mv
                          3 - collector - 0 - 3.2V
                          Last edited by doesntmind; 11-30-2018, 05:43 PM.

                          Comment

                          • doesntmind
                            Senior Member
                            • Feb 2014
                            • 61
                            • usa

                            #33
                            Re: toshiba 42tl515u problems

                            Originally posted by budm
                            Report the Voltages of all 3 pins with ref to gnd when TV is OFF and when power switch is activated.
                            Bur at this point you have more than just he BL-ON. Do you have PWM Dimming control signal?
                            Do you have 12VDC feeding the T-CON?

                            forgot last question, i only found 3v on one pin but couldnt find 12v anywhere on tcon

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: toshiba 42tl515u problems

                              Originally posted by doesntmind
                              forgot last question, i only found 3v on one pin but couldnt find 12v anywhere on tcon
                              Did you check right at both ends of the SMD fuse on the T-CON board? You know where the fuse is, right?
                              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

                              • doesntmind
                                Senior Member
                                • Feb 2014
                                • 61
                                • usa

                                #35
                                Re: toshiba 42tl515u problems

                                Originally posted by budm
                                Did you check right at both ends of the SMD fuse on the T-CON board? You know where the fuse is, right?
                                I read 300mV at both sides of fuse while system is on, 20mV when standby

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: toshiba 42tl515u problems

                                  Originally posted by doesntmind
                                  I read 300mV at both sides of fuse while system is on, 20mV when standby
                                  You have more than just no bl-on problem, the MAIN is not sending the signal to turn on the switched MOSFET to supply the 12V to the T-CON either.
                                  So more in-depth troubleshooting of the main board will be required, so you can spend lots of time locating the schematic of your main board and do more testing.
                                  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

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