Sony KDL-46EX400 2 blink error code

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  • tibimakai
    Badcaps Legend
    • Jan 2012
    • 3680
    • USA

    #61
    Re: Sony KDL-46EX400 2 blink error code

    I have checked a couple of those components and they didn't appear bad.
    So no luck with that find. It may help somebody else in the future.

    Comment

    • tibimakai
      Badcaps Legend
      • Jan 2012
      • 3680
      • USA

      #62
      Re: Sony KDL-46EX400 2 blink error code

      To tell you the truth, I don't know what to do next.
      I can't flip over the board to do those measurements.
      What I'm noticing is that with the old board, the 12V won't stay on as with the one from Ebay. They turn on(except the T-con 12V) and then off.
      The AC_OFF_DET= 2.77V, not getting higher.
      Audio 12V and the Reg_12V they both turn on, but then off.

      Comment

      • tibimakai
        Badcaps Legend
        • Jan 2012
        • 3680
        • USA

        #63
        Re: Sony KDL-46EX400 2 blink error code

        I have just used a 1k resistor and a 2.2k resitor to boot up the PS and I have backlight.
        The T-con voltages are still missing though.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #64
          Re: Sony KDL-46EX400 2 blink error code

          T-con volt may or may not be switched by main board.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • tibimakai
            Badcaps Legend
            • Jan 2012
            • 3680
            • USA

            #65
            Re: Sony KDL-46EX400 2 blink error code

            It has a T_ON pin on the connector.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #66
              Re: Sony KDL-46EX400 2 blink error code

              The T-ON pin is the receiving pin which gets its ON command from the main board.
              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

                #67
                Re: Sony KDL-46EX400 2 blink error code

                What should be the next step?
                It could be something with the Q6151, Q6152, Q6554 area?
                Last edited by tibimakai; 09-23-2013, 09:45 AM.

                Comment

                • tibimakai
                  Badcaps Legend
                  • Jan 2012
                  • 3680
                  • USA

                  #68
                  Re: Sony KDL-46EX400 2 blink error code

                  Should I try booting up the T_Con_ON with another resistor?

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #69
                    Re: Sony KDL-46EX400 2 blink error code

                    You can use the 1k resistor on the T_ON and the STBY voltage to force on the 12v T-CON but you have to disconnect that wire which goes back to the main board because the out put may be stuck in grounded mode. You can see that in the SCH that I had redlined.
                    Last edited by budm; 09-23-2013, 10:21 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

                      #70
                      Re: Sony KDL-46EX400 2 blink error code

                      It's disconnected right now.
                      I have a 1K resistor going to the PS_ON and another one to the BL_ON. A third one will go to T-Con_On.
                      I will try it out tomorrow.
                      I guess, if it will turn on, then I have a bad mainboard and if not, then I have an issue at the T_Con 12V stage, am I right?
                      Thanks.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #71
                        Re: Sony KDL-46EX400 2 blink error code

                        If the 12V does not present at the 12v T-CON pin, then that may be the reason for the error code, the service manual keeps mentioning about 12V power supply failure. There is not much in that section of T-CON power supply.
                        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

                          #72
                          Re: Sony KDL-46EX400 2 blink error code

                          The other 12Vs turn on, only the T_Con 12V doesn't turn on.
                          I will try it out when I can. Right now my lower back flared up.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #73
                            Re: Sony KDL-46EX400 2 blink error code

                            Q6151 power MOSFET is being used as a switch to supply the T-CON 12V, if you short the E and C of the transistor Q6152, that will turn on the MOSFET Q6151, you can force it on that way also instead of using the 1K to feed the B of Q6152 to turn it on.
                            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

                              #74
                              Re: Sony KDL-46EX400 2 blink error code

                              I will do that, I don't have another 1K resistor.

                              Comment

                              • tibimakai
                                Badcaps Legend
                                • Jan 2012
                                • 3680
                                • USA

                                #75
                                Re: Sony KDL-46EX400 2 blink error code

                                I have used the 2.2K which I have used to start up the BL.
                                T_CON 12V it shows 12.73V.
                                So the power supply is good, no?
                                I need another main board right(the third one on this TV)?

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #76
                                  Re: Sony KDL-46EX400 2 blink error code

                                  That means some how the new board also failed to send out the T_ON signal.
                                  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

                                    #77
                                    Re: Sony KDL-46EX400 2 blink error code

                                    What I don't understand is, why every time I get a "new" board, it works for a while and then doesn't turn on, on an another day?
                                    I update the firmware too, to the latest one available.

                                    Comment

                                    • tibimakai
                                      Badcaps Legend
                                      • Jan 2012
                                      • 3680
                                      • USA

                                      #78
                                      Re: Sony KDL-46EX400 2 blink error code

                                      There is a way to reset these mainboards? Clear the error log?

                                      Comment

                                      • tibimakai
                                        Badcaps Legend
                                        • Jan 2012
                                        • 3680
                                        • USA

                                        #79
                                        Re: Sony KDL-46EX400 2 blink error code

                                        Before I'm going ahead to buy another mainboard, I would like to ask a question.
                                        The 12.73V is not to high to damage something in the mainboard?
                                        It's just weird, that two boards have the same symptom, not counting the original board.

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #80
                                          Re: Sony KDL-46EX400 2 blink error code

                                          On a 12V rail, that is fine. If it were 15 ~ 20V, damage could occur.
                                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                          Comment

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