TOSHIBA 46RV555DB No picture but sound back light is on

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  • Andyd1970
    Badcaps Veteran
    • Feb 2013
    • 374
    • united kingdom

    #1

    TOSHIBA 46RV555DB No picture but sound back light is on

    Hi All,

    Help please! I have a 46 inch TOSHIBA RV555DB that has sound but no picture! The back light is on as you can see it through the holes in the metal panel behind the screen. The PSU does make a whine when it is first switched on. I was wondering if it was T-Con? I am prety good with a meter so wondered if I could prove it by checking some voltages?

    Thank you in advance

    Andy
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: TOSHIBA 46RV555DB No picture but sound back light is on

    Could well be the T-con.

    Pictures of the insides of the TV would help us help you. Especially a clear picture of the T-con.
    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

    • Andyd1970
      Badcaps Veteran
      • Feb 2013
      • 374
      • united kingdom

      #3
      Re: TOSHIBA 46RV555DB No picture but sound back light is on

      Hi Tom66,

      Thank you for the reply, great to know people are out there with your knowledge.

      See attached pics of the back of the TV to give over view and close ups of the T-Con.

      Thank you for your help.

      Andy
      Attached Files

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: TOSHIBA 46RV555DB No picture but sound back light is on

        OK, with your meter, can you test the voltage on both ends of "F1" on the t-con? It's that white/gold object near the left main data connector.
        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

        • Andyd1970
          Badcaps Veteran
          • Feb 2013
          • 374
          • united kingdom

          #5
          Re: TOSHIBA 46RV555DB No picture but sound back light is on

          Hi Tom,

          Just checked and I read 12.1volts each side, it did dip to 11.3v for a moment and then back upto 12.1v. I did notice a constant ticking from the PSU.

          Andy

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: TOSHIBA 46RV555DB No picture but sound back light is on

            I think you'll need to remove that shield from the 100Hz processing board and get a picture of that. Perhaps something on that is bad. Is the ticking a relay clicking sound or quite faint?
            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

            • Andyd1970
              Badcaps Veteran
              • Feb 2013
              • 374
              • united kingdom

              #7
              Re: TOSHIBA 46RV555DB No picture but sound back light is on

              Hi,

              I have removed the shielding and cannot see any obvious damage or bad components, I used an eye glass to look closely. See attached pic. The ticking sounds like a relay ticking in the bottom left hand side of the PSU.

              Andy
              Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: TOSHIBA 46RV555DB No picture but sound back light is on

                Check the voltage across this cap.
                Attached Files
                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

                • Andyd1970
                  Badcaps Veteran
                  • Feb 2013
                  • 374
                  • united kingdom

                  #9
                  Re: TOSHIBA 46RV555DB No picture but sound back light is on

                  12.2 Volts on the top of each of those caps, and 11mv on the bottom of each of them.

                  Andy

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: TOSHIBA 46RV555DB No picture but sound back light is on

                    OK, let's try a different angle. On the PSU, can you locate exactly where the clicking is coming from?
                    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

                    • Andyd1970
                      Badcaps Veteran
                      • Feb 2013
                      • 374
                      • united kingdom

                      #11
                      Re: TOSHIBA 46RV555DB No picture but sound back light is on

                      I am pretty sure it is coming from SR80, which is in the bottom left hand corner of the PSU it is the the second from bottom relay, in the attached picture.

                      So the checks we have done has that proved the T-Con and the other board are ok?

                      Andy
                      Attached Files

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: TOSHIBA 46RV555DB No picture but sound back light is on

                        It proves they have power but nothing further. Hmm, the TV stays on through the ticking sound?
                        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

                        • Andyd1970
                          Badcaps Veteran
                          • Feb 2013
                          • 374
                          • united kingdom

                          #13
                          Re: TOSHIBA 46RV555DB No picture but sound back light is on

                          Yes the TV is still on and the sound is clear and not distorted.

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: TOSHIBA 46RV555DB No picture but sound back light is on

                            How frequent is the ticking? About once a second, faster, slower?
                            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

                            • Andyd1970
                              Badcaps Veteran
                              • Feb 2013
                              • 374
                              • united kingdom

                              #15
                              Re: TOSHIBA 46RV555DB No picture but sound back light is on

                              It is quicker that once a second. The board to the left of the PSU just shows the bottom of it in the last picture when first switch on the transformer on it squeals and then settles after about 5 seconds.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: TOSHIBA 46RV555DB No picture but sound back light is on

                                Use a toilet roll tube to locate the exact source of the sound.
                                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

                                • Andyd1970
                                  Badcaps Veteran
                                  • Feb 2013
                                  • 374
                                  • united kingdom

                                  #17
                                  Re: TOSHIBA 46RV555DB No picture but sound back light is on

                                  100% SR80 is ticking

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: TOSHIBA 46RV555DB No picture but sound back light is on

                                    It is whining or ticking?
                                    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

                                    • Andyd1970
                                      Badcaps Veteran
                                      • Feb 2013
                                      • 374
                                      • united kingdom

                                      #19
                                      Re: TOSHIBA 46RV555DB No picture but sound back light is on

                                      SR80 is just ticking I guess about 2 times per second.

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: TOSHIBA 46RV555DB No picture but sound back light is on

                                        So where is the whining coming from?
                                        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

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