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    Toshiba 32AV502RZ

    Hi all, last week I jumped into a thread I thought was for my TV model but it turns out the board in question was a different part number. I was asked to provide the pictures of my board in my own thread so here goes.

    My TV will not turn on, when I push power button or use remote nothing happens, no error code no blinking lights. I took the back cover off and found the main fuse had blown, tried replacing it and as soon as I plugged it back in the new fuse blew again. Following the previous thread I tested the bridge rectifier and it did not pass the test. Using a multimeter on OHM setting I tested points one and 2 on the rectifier and with the leads one way I got no reading and when reversed i got a reading. On points 3 and 4 i get a reading both way the multimeter leads are connected. Are there any other things that I should check or would the bridge rectifier be enough to cause the main fuse to blow? I have attached pictures of both the front and back of the board and the part number.

    Any assistance is greatly appreciated

    Paul
    Attached Files

    #2
    Re: Toshiba 32AV502RZ

    I seem to remember someone on this forum reporting exactly the same issue with a 32" Toshiba. It turned out to be the surge suppressor TVS1 which had failed.

    You can temporarily remove it and test the TV without it before ordering a replacement to see if it is at fault. Without it, the TV won't have much protection from mains surges, but it will be fine for a 5 minute test.
    Last edited by tom66; 05-25-2012, 04:55 PM.
    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


      #3
      Re: Toshiba 32AV502RZ

      It was this thread: https://www.badcaps.net/forum/showthread.php?t=20565
      That Model has shorted TVS. I asked Oconnorp to post new thread since his TV is not the same model or boards.
      @Oconnorp, please post straight shot pictures of the boards with good lights, I can hardly see anything on the pictures, thanks.
      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


        #4
        Re: Toshiba 32AV502RZ

        sorry thought these posted over the weekend. Not sure what happened. Here are the pictures front and back. Hopefully better than the other ones
        Attached Files

        Comment


          #5
          Re: Toshiba 32AV502RZ

          On the back of the board - primary side there is a largish 8 legged component
          Looks damaged in the picture - is it? Has it got a part number on it that yu can read.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment


            #6
            Re: Toshiba 32AV502RZ

            Use your multimeter on the 200 ohm range to check this device TVS1. You should see no change when probing it if it is good. Do this with the TV unplugged.
            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


              #7
              Re: Toshiba 32AV502RZ

              The 8 legged creature looks ok to me, must be a shadow in the picture. I probed the tvs1 as indicated in your picture it reads 0.6 steady when I hold the probes on it.

              Thanks

              Comment


                #8
                Re: Toshiba 32AV502RZ

                0.6 Ohm? That sound like the same problem with the other Toshiba on that thread you were asking the question, the TVS was shorted out. You can remove it, put in the new fuse to test, the TV should come on now
                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


                  #9
                  Re: Toshiba 32AV502RZ

                  While you can remove it for testing, I would not plan on just leaving it out. It is part of the surge protection on the power supply. Leaving that part out would leave your TV more susceptible to lightning/surge damage.

                  Comment


                    #10
                    Re: Toshiba 32AV502RZ

                    Thanks guys I will try removing it tomorrow as a test and let you know how I make out.

                    Comment


                      #11
                      Re: Toshiba 32AV502RZ

                      Removed tvs1 and tv will now power on. Thanks. What is next step?

                      Thanks again

                      Comment


                        #12
                        Re: Toshiba 32AV502RZ

                        Originally posted by Oconnorp View Post
                        Removed tvs1 and tv will now power on. Thanks. What is next step?

                        Thanks again
                        Replace the TVS with one such as this device.

                        http://www.digikey.com/product-detai...PCT-ND/2776400

                        Check the lead diameter (1.3mm max) will fit the hole.
                        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


                          #13
                          Re: Toshiba 32AV502RZ

                          Or this one from Mouser:
                          Surge protection: BI-DIRCETIONAL TVS
                          Vishay:
                          http://www.mouser.com/ProductDetail/...dcLaMwTMwps%3d

                          Which was used in the other TOSHIBA on another post.

                          I would go with DIGIKEY since they will do USPS shipping at low cost.
                          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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