Sanyo DP46849 Won't Power up

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  • kevinw
    New Member
    • Oct 2010
    • 6
    #1

    Sanyo DP46849 Won't Power up

    Hello all

    I have a Sanyo DP46849 LCD TV which will not power up. The pwr supply has 5V and the green light will come on when the "on" button is pressed, but the screen remains dark. Passing 5V to the BL ON line causes the backlights to flicker, but they will not "come on", suggesting a safety shutdown (?).

    Does this sound like bad caps on the power supply or is there something more ominous at work here?

    Any input would be welcome!

    Thanks,
    Tags: None
    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: Sanyo DP46849 Won't Power up

      1) Ask the moderators to move your thread to

      Troubleshooting TVs and Video Sources

      2) We will require clear focused top down view/picture of all your boards. See my sig file below for instructions.

      3) If your backlights are shutting off, you could have one or more of the following

      a) open fuse especially if there is more than one fuse on the inverter board
      b) bad caps on inverter board
      c) unstable power from power supply
      d) a transfomer secondary winding that is bad
      e) bad ccfl or wiring
      f) a transistor or mosfet that is shorted

      A, c, d, and f are easily tested with a multimeter. B can be tested with an ESR meter. E is a bit trickier to test.
      Last edited by retiredcaps; 12-23-2011, 02:04 AM.
      --- begin sig file ---

      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

      Please do not post inline and offsite as they slow down the loading of pages.

      --- end sig file ---

        Comment

        • kevinw
          New Member
          • Oct 2010
          • 6
          #3
          Re: Sanyo DP46849 Won't Power up

          Thanks for the guidelines and suggestions.

          I'll ask the moderators to move my message, to the correct area (with pics. etc. as you suggest).

          Thanks,

          Kevin W
          Last edited by kevinw; 12-23-2011, 10:56 AM.

            Comment

            • retiredcaps
              Badcaps Legend
              • Apr 2010
              • 9271
              #4
              Re: Sanyo DP46849 Won't Power up

              Here is how PlainBill would like the picture composition.

              https://www.badcaps.net/forum/showpo...76&postcount=2
              --- begin sig file ---

              If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

              We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

              Please do not post inline and offsite as they slow down the loading of pages.

              --- end sig file ---

                Comment

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