Sony kdl-55ex723 4 blinks.

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  • erickeri1234
    Senior Member
    • May 2013
    • 98
    • usa
    #1

    Sony kdl-55ex723 4 blinks.

    Need help on eliminating if its the ldblk board or if it is a bad L.E.D. I have come a cross some bad leds in tv's already. So I just bought a led tv backlight tester. Model GJ2C.
    I have played with it a little on a bad set of leds. So I'm somewhat getting the hang of it.

    Comes on for 2 seconds I can see channels 4 but then turns off
    But anyways kdl-55ex723 with 4 red blinks. I tested the strips in the tv and I'm getting 180v out of each wire. There are 4 negatives and 4 positives. Is there a way to test the ldblk board..
    Last edited by erickeri1234; 07-18-2017, 04:26 PM. Reason: Add
    Tags: None
    • erickeri1234
      Senior Member
      • May 2013
      • 98
      • usa
      #2
      Re: Sony kdl-55ex723 4 blinks.

      Up

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Sony kdl-55ex723 4 blinks.

          So it has 4 strings of LEDs and each string shows total Vf of 180V?
          We need good clear pictures of the whole backside fo the TV showing all the board so we can see what we are dealing with.
          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

            • erickeri1234
              Senior Member
              • May 2013
              • 98
              • usa
              #4
              Re: Sony kdl-55ex723 4 blinks.

              Yea 180v out of 4 strips I'm guessing.
              Attached Files

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Sony kdl-55ex723 4 blinks.

                  "There are 4 negatives and 4 positives."
                  OK, you need to test the DCV at all 4 Negative which are the cathode return for the LED strings.
                  What you have to do is:
                  1) TV is OFF.
                  2) Black probe of the meter to the chassis.
                  3) Red probe of the meter on the first Negative.
                  4) Keep your eye on the meter and then turn on the TV and see what the Voltage reading is before the screen black out, then turn the TV off.
                  5) Move the red probe to the second Negative and then repeat step 4, then do that 2 more times for Negative 3, Negative 4.
                  6) Report those 4 readings to us.
                  We are looking to see if all 4 Negatives give us the same reading or not.
                  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

                    • erickeri1234
                      Senior Member
                      • May 2013
                      • 98
                      • usa
                      #6
                      Re: Sony kdl-55ex723 4 blinks.

                      Sorry been very busy. Seems like when I get down with one thing 5 more things get in the way. Buy anyways
                      I tested it first with the negative connector disconnected
                      Here are the numbers. I got 2 different numbers on the same per wire.

                      1. 42.xx dcv and 122.xx dcv
                      2. 39.83 dcv and 120.xx dcv
                      3. 41.43 dcv and 121.00 dcv
                      4. 40.50 dcv and 120.50 dcv

                      Then I did it with the negative connector plugged in, then I got the same first numbers just no high dcv.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: Sony kdl-55ex723 4 blinks.

                          I do not understand your results, what I need are the reading on the Negative return wires with every thing all hooked back up in place.
                          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

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