Sony Bravia kdl-42w705b sound and backlight but no picture

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  • Seanl84
    Member
    • Dec 2015
    • 11
    • Ireland
    #1

    Sony Bravia kdl-42w705b sound and backlight but no picture

    As above guys, any common causes? Set turns on and backlight can be seen though screen stays black/blank.. T-con/main fault?
    Haven't actually got my hands on this one yet, hopefully collecting it tomorrow..

    Cheers, Sean
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Sony Bravia kdl-42w705b sound and backlight but no picture

      You need to check the DCV between chassis GND and both ends of the SMD fuse on the T-CON 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

        • Seanl84
          Member
          • Dec 2015
          • 11
          • Ireland
          #3
          Re: Sony Bravia kdl-42w705b sound and backlight but no picture

          DCV between chassis GND and both sides of t-con fuse is 12v.. Any ideas?

            Comment

            • Seanl84
              Member
              • Dec 2015
              • 11
              • Ireland
              #4
              Re: Sony Bravia kdl-42w705b sound and backlight but no picture

              Right, just connected this TV up to another set via the av out and low and behold there is a picture..

              So t-con or panel?

              Any way of testing the t-con further? It's getting 12v and the smd fuse is fine. I have another t-con ordered, but I wouldn't mind trying to repair this one if possible

                Comment

                • opipva4a
                  New Member
                  • Nov 2010
                  • 1
                  #5
                  Re: Sony Bravia kdl-42w705b sound and backlight but no picture

                  Hi there,

                  i'm on same boat. There is a backlight, but screen remains blank. When power on just hear sound from tuner about 1 sec and then stops.
                  No any red error codes from diode, except powered it up without (disconnected TCON cable) to get 5 red blinks.
                  Already tested T-CON and getting 12v both sides of the fuse. So same situation - Main BAXL board or TCON? Any ideas?


                  Thanks in advance

                    Comment

                    • ReeceyBurger123
                      Never Give Up !
                      • May 2014
                      • 7325
                      • Britain
                      #6
                      Re: Sony Bravia kdl-42w705b sound and backlight but no picture

                      I had one of these shorted MLCC on the Tcon not easy to find.
                      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

                        • sansiro2
                          Member
                          • May 2016
                          • 18
                          • United Kingdom
                          #7
                          Re: Sony Bravia kdl-42w705b sound and backlight but no picture

                          Hi guys, did anyone manage to work out the fix for this? Could the LDVS cable cause this?

                            Comment

                            • chrle
                              Senior Member
                              • Sep 2013
                              • 158
                              • slovakia
                              #8
                              Re: Sony Bravia kdl-42w705b sound and backlight but no picture

                              old post but did you fix this tv? I have same problem.

                              I replaced another T-con and still nothing,I think that panel is bad.

                                Comment

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