Sony KDL-46EX400 2 blink error code

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #121
    Re: Sony KDL-46EX400 2 blink error code

    Need to look at the circuit diagram of the latching circuit since it receives 3 signals (excessive 12v, excessive PFC voltage, excessive temperature) which any one of them can trip the circuit. It is a matter of finding out which one is tripping or the latching circuit may be at fault itself, this is where the diagram comes into play to narrow down the cause of the problem. You can disable one of the 3 signal at a time to find out which one is sending that signal to the latching circuit.
    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

    • tibimakai
      Badcaps Legend
      • Jan 2012
      • 3680
      • USA

      #122
      Re: Sony KDL-46EX400 2 blink error code

      Hi Bud, did you have a chance to look at this TV?

      Thank you,

      Tibor

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #123
        Re: Sony KDL-46EX400 2 blink error code

        I know I found the training manual but I do not remember fi you or I find the service manual for it or not, do you remember? It is a long thread and I just do not have the time to look through the whole thread again.
        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

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #124
          Re: Sony KDL-46EX400 2 blink error code

          Never mind, you have it on post 56.

          OK, I will have to down load the service manual tonight:
          Last edited by budm; 02-20-2014, 03:09 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

          • tibimakai
            Badcaps Legend
            • Jan 2012
            • 3680
            • USA

            #125
            Re: Sony KDL-46EX400 2 blink error code

            I have just made an offer on Ebay for a mainboard($70). The TV has a broken screen, pictured in the ad and he is only a couple miles away from me, in Burbank.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #126
              Re: Sony KDL-46EX400 2 blink error code

              Well, that service manual does not have schematic diagram!
              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

              • tibimakai
                Badcaps Legend
                • Jan 2012
                • 3680
                • USA

                #127
                Re: Sony KDL-46EX400 2 blink error code

                Picked up the board from the seller's store and installed it and it worked since Saturday. Let's hope that I won't have any issues from now on.
                Most likely, the other mainboards were bad boards.
                Thank you for the help.
                Now, I need to go back to the LED LG 42LV3500 with the restarting issue? Any pointers?
                I'm thinking, that I should pick up a mainboard for that too.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #128
                  Re: Sony KDL-46EX400 2 blink error code

                  Did you take the voltage readings so we will have a ref. info for the next time?
                  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

                  • tibimakai
                    Badcaps Legend
                    • Jan 2012
                    • 3680
                    • USA

                    #129
                    Re: Sony KDL-46EX400 2 blink error code

                    No I haven't.
                    Should I take all the voltages from the PS connector?

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #130
                      Re: Sony KDL-46EX400 2 blink error code

                      Yes, we need to see the 12V, 24V and the PFC voltages, from you have posted, they are not at extreme level at all, this will tell us if the detection circuit is at fault or not. The more info you have the better. You might as well take some reading on the inverter board also like the LD, FB. The power supply board: BL_ERR, INV_ERR etc.
                      Take the reading when TV is off and when TV is on.
                      Last edited by budm; 02-24-2014, 03:25 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

                      • tibimakai
                        Badcaps Legend
                        • Jan 2012
                        • 3680
                        • USA

                        #131
                        Re: Sony KDL-46EX400 2 blink error code

                        One thing that I have noticed with the bad board that the T_Con ON voltage it was almost missing(0.014V), this voltage should have started up the T_Con 12V to supply the T_Con.
                        In my opinion, there it was the problem.

                        Comment

                        • anthonystv
                          Senior Member
                          • Jun 2014
                          • 73
                          • USA

                          #132
                          Re: Sony KDL-46EX400 2 blink error code

                          I just got one of these things in
                          Thanks for all the research you guys have done thus far
                          but I have a delemma wether to invest anything in this or not
                          its a 2 blinker KDL46EX500
                          after looking at your schematics I got to power board to give me everything but backlight
                          the BL on from the main board is low all the time
                          but if i open it and provide my own 3.3v it still does not turen the BL on
                          the TCON on never goes high
                          but if i short the transistor as you stated it does put out tcon 12v
                          now here is the delemma since the power board should be able to produce a BL with BL on going high ....
                          I have nothing not even trying
                          the power board must be bad in this area
                          but the main board wont tell the BL to turn either or the tcon but it does tell the rest of the board to run audio 12 12v etc ...so it looks like i have a bad power board and a bad main do you agree
                          ?? or does the power board need something else to fire HV for the BL?
                          dimmer???

                          Comment

                          • tibimakai
                            Badcaps Legend
                            • Jan 2012
                            • 3680
                            • USA

                            #133
                            Re: Sony KDL-46EX400 2 blink error code

                            Did you try forcing the power supply, to turn on with resistors from standby voltage to PS_ON and another one to the BL?
                            This way, you can see if the voltages are there and the backlight is working or not.

                            Comment

                            • Louis82
                              Badcaps Veteran
                              • Feb 2012
                              • 240
                              • USA

                              #134
                              Re: Sony KDL-46EX400 2 blink error code

                              Hello fellas.
                              I have same tv as anthonystv KDL46ex500. Tried the resistor 1k resistor between Stb3.3 and Power On and I'm not getting any 12v. My readings are all 0 except the Stb, Power on and Ac_off_det that read 3.3v. Any suggestions? Thank you
                              Attached Files
                              Last edited by Louis82; 09-11-2015, 09:28 AM.

                              Comment

                              • rick_noname
                                New Member
                                • Jul 2015
                                • 1
                                • Netherlands

                                #135
                                Re: Sony KDL-46EX400 2 blink error code

                                Check BAL board on up side behind cooling frame, Fuse F3703 smd 3,15 A blowed.
                                When it`s defective check also the little capacitor between fuse and ground. Most of the time is shorted. Removing the capacitor and replace the fuse and the TV is back working.

                                See picture:

                                I hope this will work. Also when the TV is not give any error but the green led is working check the same positions.

                                Greetings Patrick www.mofix.nl

                                Comment

                                • chrisl32
                                  Member
                                  • Feb 2021
                                  • 39
                                  • france

                                  #136
                                  Re: Sony KDL-46EX400 2 blink error code

                                  sorry ... wrong thread
                                  Last edited by chrisl32; 04-05-2021, 08:04 AM. Reason: error

                                  Comment

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