Sony Bravia KDL-46EX723 PSU Dead, No Standby

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  • martyparish
    Badcaps Veteran
    • Dec 2012
    • 313
    • United States
    #1

    Sony Bravia KDL-46EX723 PSU Dead, No Standby

    Hi folks,

    it's been a while since I've posted on this great resource! FYI I have exhausted myself searching and testing but still need some assistance please.

    The original situation: It started as a 5 blink error code, which means TCON, Panel or HWR(from service manual). I tried reseating the LVDS cable and nothing changed, then I disconnected the two ribbons that go from TCON to Panel and viola!! The TV came on with green LED lit and backlights lit.

    So I tried again with one of each panel ribbon connected and with the left one connected it was 5 blink error and with right cable connected the TV came alive.

    The situation NOW: The TV was sitting there on and I was testing the TCON fuse voltages and all of a sudden it turned off(I am 99% sure I didn't short it out). Now the PSU is DEAD!!

    There is zero power on the secondary connector pins including STBY.

    The main filter cap is getting ~170v(USA 120v mains).

    I'm suspecting the standby IC cct but not sure how to go about testing to be sure. The IC is:

    MIP2H2

    No datasheet available but there is a cct here: http://www.irantk.ir/Power_IC/irantk_Datasheet/MIP2H2_Schematic.pdf


    Would any of you kind folks be able to help me proceed?

    First, do you think it's a bad panel and I should just scrap my efforts? Or maybe it's tcon(cheap) and I should pursue fixing the PSU(expensive)?

    Much appreciated! Pictures attached.


    Marty P
    MD, USA
    Attached Files
    Tags: None
    • martyparish
      Badcaps Veteran
      • Dec 2012
      • 313
      • United States
      #2
      Re: Sony Bravia KDL-46EX723 PSU Dead, No Standby

      UPDATE: Standby 3.3v is THERE... Not sure if it was my oversight or maybe because it was sitting in the sun for a while. Still no front led or relay click. Hope I didn't kill the main board...

      I guess the next test is manually trigger BL_ON?

      Every pin on BOTH connectors reads 0v except STBY3.3.
      Attached Files
      Last edited by martyparish; 01-29-2016, 08:35 AM. Reason: added measurements + legend pic

        Comment

        • martyparish
          Badcaps Veteran
          • Dec 2012
          • 313
          • United States
          #3
          Re: Sony Bravia KDL-46EX723 PSU Dead, No Standby

          One more update: I applied voltage to POWER ON via 470ohm resistor and STBY3.3v. This fired up the PSU. I heard the relay click and most of the 12v pins came on.(tcon vcc did NOT come on but assuming because I need to also apply 3.3v to TCON ON)

          Is it a fried main board?

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Sony Bravia KDL-46EX723 PSU Dead, No Standby

              The commands to the power supply board are generated by the main board, so something on the main board is at fault to not send the command signals or it is locked out due to error.
              Is the AC_OFF DET at 0V? It should be 3V or more for normal operation.
              Last edited by budm; 01-29-2016, 09:59 AM.
              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

                • martyparish
                  Badcaps Veteran
                  • Dec 2012
                  • 313
                  • United States
                  #5
                  Re: Sony Bravia KDL-46EX723 PSU Dead, No Standby

                  Thanks Bud. I've checked all the fuses(tiny!) that I could locate on the main board and they checked out.

                  Did you happen see in the original post about the original problem? Was wondering what you thoughs were on whether it's a bad panel(tab bonds?) or just bad tcon.

                  Main board= $125
                  TCON=$40

                  probably not worth it eh?

                    Comment

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