SONY KDL-40NX700 2 red led blink problem

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  • ozguven
    New Member
    • Dec 2023
    • 9
    • TURKEY

    #1

    SONY KDL-40NX700 2 red led blink problem

    When the power is turned on, a snapshot appears on the screen and it turns off. 2 red LEDs are flashing.

    I disconnected the power module cable going to the main board. I threw a power on jumper with 3.3 v from outside. The relay is working and there is 12v and other voltages in the power socket.

    Where else should I look? All fuses appear to be intact.​
  • Davi.p
    Hobbist Tech
    • Sep 2009
    • 4316
    • Italy - Milan

    #2
    Check the service manual for that 2 blinks, i suspect backlight..

    Comment

    • ozguven
      New Member
      • Dec 2023
      • 9
      • TURKEY

      #3
      Hello,

      This is what is stated in the manual.
      TWO Blinks---B+ over current protection (OCP) , unit goes to the standby
      mode then displays the 2 blink fault. Could be a short in the power supply of
      any of the circuits.

      When turned on, the backlight turns on momentarily. Then everything shuts down. I tried to measure it with a voltmeter until it shut down. Something like 85v. The voltmeter cannot read quickly until the relay closes.​

      Comment

      • Davi.p
        Hobbist Tech
        • Sep 2009
        • 4316
        • Italy - Milan

        #4
        Try to disconnect the tcon and see if blinks becomes 5

        Comment

        • ozguven
          New Member
          • Dec 2023
          • 9
          • TURKEY

          #5
          yes, I didn't say Tcon Power. Then it blinking 5 times.

          Comment

          • ozguven
            New Member
            • Dec 2023
            • 9
            • TURKEY

            #6
            I also suspect the rear lush led bars. I want to be sure of dismantling everything.

            Comment

            • ozguven
              New Member
              • Dec 2023
              • 9
              • TURKEY

              #7
              I wrote it incorrectly. I also suspect the back light led bars. I want to be sure of dismantling everything.

              Comment

              • vinceroger69
                Badcaps Legend
                • Mar 2012
                • 6714
                • uk

                #8
                If i remember these sets have edgelit leds these are older sets now i think 2010 era so my guess is bad leds

                Comment

                • ozguven
                  New Member
                  • Dec 2023
                  • 9
                  • TURKEY

                  #9
                  Yes. The device manufactured in 2010.

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12144
                    • U.S.

                    #10
                    It's a 40 inch screen, you shouldn't have a problem taking it apart if you go slow and take your time, just treat the panel like a baby.

                    Comment

                    • Davi.p
                      Hobbist Tech
                      • Sep 2009
                      • 4316
                      • Italy - Milan

                      #11
                      Don't run.. dismantling panel is always risky, test the tcon at bench with bench psu, check the various converters, or at least if psu goes protect mode..

                      Comment

                      • ozguven
                        New Member
                        • Dec 2023
                        • 9
                        • TURKEY

                        #12
                        Now I removed the panel. I tested the LED bars. LEDs on one side did not light up. There are 4 bars in total. Grouped in pairs of 2. I tested the double group of bars I tested one by one. 2 LEDs in one of the bars are faulty. I wonder if this is the source of the problem.

                        Comment

                        • vinceroger69
                          Badcaps Legend
                          • Mar 2012
                          • 6714
                          • uk

                          #13
                          Originally posted by ozguven
                          Now I removed the panel. I tested the LED bars. LEDs on one side did not light up. There are 4 bars in total. Grouped in pairs of 2. I tested the double group of bars I tested one by one. 2 LEDs in one of the bars are faulty. I wonder if this is the source of the problem.
                          yes once you replace the strips the tv should work fine again (i have just repaired a tv just one led had failed and caused no backlight at all)

                          Comment

                          • ozguven
                            New Member
                            • Dec 2023
                            • 9
                            • TURKEY

                            #14
                            OK. Thanks.
                            I will change it as soon as possible and share the result.

                            Comment

                            • ozguven
                              New Member
                              • Dec 2023
                              • 9
                              • TURKEY

                              #15
                              LED bars arrived today. I made the change and tested it. It works perfectly. Thanks to everyone who helped.

                              Comment


                              • vinceroger69
                                vinceroger69 commented
                                Editing a comment
                                Thats good to hear and another tv saved from landfill.

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