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    #1

    Sony Bravia 32-inch, No Picture but Backlight is ON

    hi,
    I came across this forum, and read some great posts. Im having some issues with my Sony Bravia, I thought of posting in this forum.

    After 1.5yrs of happy viewing, my TV is having trouble with picture. Backlight is always on, but there is no picture. Its not that the picture doesnt always show up, but whenever I switch on TV I could see picture for sometime, and then suddenly it goes blank. Sometimes, this happens within 30mins, sometimes TV works fine for as long as 4hours. If I switch off the TV for 1hr, and start the TV, it again works fine!

    I called up Sony CustomerCare, and the technician visited my house. He told that the issue is with LCD Panel, and the panel should be replaced {he told that the panel is very costly}. Now I'm somewhat hopeful that the LCD Panel is good. {not that Im not respecting that technicians inputs, but...}. If the panel is really damaged, then picture should never show up! But I can see the picture for sometime.
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    #2
    Re: Sony Bravia 32-inch, No Picture but Backlight is ON

    Originally posted by osxmaya View Post
    hi,
    I came across this forum, and read some great posts. Im having some issues with my Sony Bravia, I thought of posting in this forum.

    After 1.5yrs of happy viewing, my TV is having trouble with picture. Backlight is always on, but there is no picture. Its not that the picture doesnt always show up, but whenever I switch on TV I could see picture for sometime, and then suddenly it goes blank. Sometimes, this happens within 30mins, sometimes TV works fine for as long as 4hours. If I switch off the TV for 1hr, and start the TV, it again works fine!

    I called up Sony CustomerCare, and the technician visited my house. He told that the issue is with LCD Panel, and the panel should be replaced {he told that the panel is very costly}. Now I'm somewhat hopeful that the LCD Panel is good. {not that Im not respecting that technicians inputs, but...}. If the panel is really damaged, then picture should never show up! But I can see the picture for sometime.
    You did not post a model number but.....

    You should count the number of blinks when the picture is off. Most Sony TVs have a blink code that indicates to a technician where to start to look.

    What you describe is quite probably a defective LCD panel. Inside the panel are a series of tubes (CCFL tubes) that are somewhat like fluorescent lights. If one or more go defective the panel generates feedback to the microprocessor indicating such a failure. The micro in turn will begin the blink codes. This is not true of all models however.

    Some techs are capable of replacing only the CCFL tube rather than the entire panel.

    Comment

      #3
      Re: Sony Bravia 32-inch, No Picture but Backlight is ON

      If the lamps were bad there would be no backlight.
      Originally posted by PeteS in CA
      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
      A working TV? How boring!

      Comment

        #4
        Re: Sony Bravia 32-inch, No Picture but Backlight is ON

        I can assure you it`s a faulty panel.

        Cadiman
        Last edited by cadiman; 05-16-2011, 05:21 PM. Reason: spelling

        Comment

          #5
          Re: Sony Bravia 32-inch, No Picture but Backlight is ON

          Originally posted by Th3_uN1Qu3 View Post
          If the lamps were bad there would be no backlight.
          You are correct. I misread that.

          Comment

            #6
            Re: Sony Bravia 32-inch, No Picture but Backlight is ON

            Thanks for your replies. Sorry for not posting the full details.

            Model no: KLV 32V550A.

            @Village Electronics: If you are talking about the blinks of the indicator {Manual says that green indicator turns red, and then blinks indicating the faults}, then the indicator stays green. There are no blinks. I dont know whether there was any feedback to the processor at all!

            Should I post the images? Which parts of the TV should I capture?

            Comment

              #7
              Re: Sony Bravia 32-inch, No Picture but Backlight is ON

              Originally posted by cadiman View Post
              I can assure you it`s a faulty panel.

              Cadiman
              From your experience, did you come across such strange behaviour? I've googled much, but unable to find the exact problem.

              Comment

                #8
                Re: Sony Bravia 32-inch, No Picture but Backlight is ON

                I am not sure about kvl, but all of the kdl had both t-con and panel failure.
                The problem is that the symptoms are about the same and the t-cons are a bit pricey.
                They did have issues with t-con boards on some models.
                You would need a panel tester to be sure. I don`t have one.

                I have seen about 75% panel failure and 25% t-con or other failure.

                There are too many used boards for these tvs to be just from broken (wii) panels.

                Comment

                  #9
                  Re: Sony Bravia 32-inch, No Picture but Backlight is ON

                  Originally posted by cadiman View Post
                  I am not sure about kvl, but all of the kdl had both t-con and panel failure.
                  The problem is that the symptoms are about the same and the t-cons are a bit pricey.
                  They did have issues with t-con boards on some models.
                  You would need a panel tester to be sure. I don`t have one.

                  I have seen about 75% panel failure and 25% t-con or other failure.

                  There are too many used boards for these tvs to be just from broken (wii) panels.
                  Thanks for your reply.

                  Before 3 days, I adjusted the panel connectors going to t-con. Im watching tv for say 1hr in the morning, 1hr in night {after work}, and its just doing great! I really want to know what the problem is! Are these panel testers bit costly? If they are cheap, i'd like to buy one and experiment with it

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                    #10
                    Re: Sony Bravia 32-inch, No Picture but Backlight is ON

                    hi,
                    Im uploading some pics. Could anyone check?
                    Attached Files

                    Comment

                      #11
                      Re: Sony Bravia 32-inch, No Picture but Backlight is ON

                      Looks very similar to kdl. You got lucky!

                      Comment

                        #12
                        Re: Sony Bravia 32-inch, No Picture but Backlight is ON

                        Originally posted by cadiman View Post
                        Looks very similar to kdl. You got lucky!
                        Well this time, the problem occured again, and there is no luck . I engaged another technician, and he told that there is some problem with protection circuit for display IC, the circuit got fully shorted. He wants me to send the TV to their lab for further analysis.

                        Comment

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