Sony KDL-46EX710 No Picture, no LED on or blinking

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  • Lrojas
    Member
    • Aug 2017
    • 23
    • USA
    #1

    Sony KDL-46EX710 No Picture, no LED on or blinking

    Hi Guys,
    I have this tv that was hit by a power surge apparently. The front led doesn't light up or blink. The Power supply clicks constantly with power applied. I read a tech manual that someone posted on the forum for this model. It says the power supply needs replacing. The particular power supply isn't as cheap or readily available as the last tv I got working, so was hoping the component level fix would be a bit more affordable and not too difficult to fix.
    Attached Files
    Tags: None
    • Lrojas
      Member
      • Aug 2017
      • 23
      • USA
      #2
      Re: Sony KDL-46EX710 No Picture, no LED on or blinking

      here are the voltage readings on the plugs attached. Blanks are no voltage

      Tcon12v GND
      (No label)
      (No label)
      Tcon vcc 12v.

      TCON ON.
      TCON VCC 12V.
      DIMMER DC
      DIMMER
      BL ON
      BL ERR 0.52v
      REG 12v
      REG 12v
      REG 12v GND
      REG 12v GND
      AUDIO 12v GND
      AUDIO 12v
      POWER ON. blips various low powers throughout clicking
      AC OFF DET. 3.35v
      STBY3 3v. 3.35v
      Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Sony KDL-46EX710 No Picture, no LED on or blinking

          TCON ON.
          DIMMER DC
          DIMMER
          BL ON
          POWER ON. blips various low powers throughout clicking

          The main board is getting the 3.3.V to run but it is not running, it is sending pulsing command signal Power ON (PS-ON) command instead of steady dcv of >2VDC, it is also not sending other commands as well as shown above.
          Something is bad on the main board, the LED indicator should at least be on if the main board is alive.
          Please up load the pictures of the whole backside of the TV showing all the boards.
          Did any other devices that are connected to the TV are damaged too?
          Last edited by budm; 09-16-2017, 01:28 PM.
          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

            • Lrojas
              Member
              • Aug 2017
              • 23
              • USA
              #4
              Re: Sony KDL-46EX710 No Picture, no LED on or blinking

              Originally posted by budm
              TCON ON.
              DIMMER DC
              DIMMER
              BL ON
              POWER ON. blips various low powers throughout clicking

              The main board is getting the 3.3.V to run but it is not running, it is sending pulsing command signal Power ON (PS-ON) command instead of steady dcv of >2VDC, it is also not sending other commands as well as shown above.
              Something is bad on the main board, the LED indicator should at least be on if the main board is alive.
              Please up load the pictures of the whole backside of the TV showing all the boards.
              Did any other devices that are connected to the TV are damaged too?

              I don't know about other devices, I bought it as part of a two tv package.
              Here is the pic you asked about. Can't get more than one pic per reply to load
              Attached Files

                Comment

                • Lrojas
                  Member
                  • Aug 2017
                  • 23
                  • USA
                  #5
                  Re: Sony KDL-46EX710 No Picture, no LED on or blinking

                  Here is just the main board
                  Attached Files

                    Comment

                    • Lrojas
                      Member
                      • Aug 2017
                      • 23
                      • USA
                      #6
                      Re: Sony KDL-46EX710 No Picture, no LED on or blinking

                      This is the reason I thought the power supply board was bad
                      Attached Files

                        Comment

                        • Lrojas
                          Member
                          • Aug 2017
                          • 23
                          • USA
                          #7
                          Re: Sony KDL-46EX710 No Picture, no LED on or blinking

                          Hey BudM,
                          so what ya think?

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA
                              #8
                              Re: Sony KDL-46EX710 No Picture, no LED on or blinking

                              At this point it points to the main board due to lacking the command signals not being sent to the power supply board, especially the pulsing PS-ON signal which should be steady DCV of more than 2 VDC. As to what the exact cause of the failure on the main board is I do not know.
                              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

                                • Lrojas
                                  Member
                                  • Aug 2017
                                  • 23
                                  • USA
                                  #9
                                  Re: Sony KDL-46EX710 No Picture, no LED on or blinking

                                  ok, I'll try to find one. thanks!

                                    Comment

                                    • Lrojas
                                      Member
                                      • Aug 2017
                                      • 23
                                      • USA
                                      #10
                                      Re: Sony KDL-46EX710 No Picture, no LED on or blinking

                                      Well I can't find a main board, this might be a lost cause

                                        Comment

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