Sony Bravia KDL-46EX621 10 blinks

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  • jimanez11
    Senior Member
    • Jan 2015
    • 93
    • USA
    #1

    Sony Bravia KDL-46EX621 10 blinks

    Hello,

    Recently picked up a Sony bravos KDL-46EX621 from Craigslist. It was bought in an unknown state, but a little troubleshooting resulted in a bad main board - no power and 4 blink error code with stand-by voltage correct and the power on signal being successfully sent to the main-board, but no boot up from there.

    I replaced the main board and tried updating the TVs software. Let the software update run and now the set doesn't stay on. It will boot, flash the "Sony" logo, then cuts itself off and the standby light blinks 10 times. The only way to get it to do anything else is to unplug the set and plug it back in.

    Any advice on this is greatly appreciated. Is it possible I purchased a bad replacement main board? Also, I can't find any information or service manuals on the KDL.

    Thanks!
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Sony Bravia KDL-46EX621 10 blinks

      Please upload good clear pictures of the whole backside of the TV so we can see how all the boards are connected together.
      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

        • jimanez11
          Senior Member
          • Jan 2015
          • 93
          • USA
          #3
          Re: Sony Bravia KDL-46EX621 10 blinks

          Thanks for the quick response. I have uploaded some pictures of the boards.
          Attached Files

            Comment

            • jimanez11
              Senior Member
              • Jan 2015
              • 93
              • USA
              #4
              Re: Sony Bravia KDL-46EX621 10 blinks

              So, have tried reseating all of the cables and hookups on the TV to ensure they were secured, but no change in the 10 blink error code. A little additional research found something mentioning that the 10 blinks is a microprocessor test, not used for errors. Am I maybe stuck in some sort of test loop?

                Comment

                • jimanez11
                  Senior Member
                  • Jan 2015
                  • 93
                  • USA
                  #5
                  Re: Sony Bravia KDL-46EX621 10 blinks

                  Wanted to bump this up to hopefully get some advice. I have requested a replacement main-board from the seller so hopefully that will resolve the issue. Is there anything I should be testing prior to returning the main?

                    Comment

                    • jimanez11
                      Senior Member
                      • Jan 2015
                      • 93
                      • USA
                      #6
                      Re: Sony Bravia KDL-46EX621 10 blinks

                      Received a new main board today and was able to install. TV immediately started doing the same thing. 10 blinks and no way to proceed without unplugging the set. Have done a little more research and found out that 10 blinks has something to do with the watchdog timer. Is the set maybe frozen due to a dead microprocesser which isn't resulting in a board failure? Any additional information on a "watchdog timer fault or next steps for troubleshooting would be appreciated. Thanks in advance!

                        Comment

                        • jphung99
                          New Member
                          • Mar 2023
                          • 1
                          • Canada
                          #7
                          Re: Sony Bravia KDL-46EX621 10 blinks

                          Hi!
                          I recently have this same problem. Has anyone able to resolve this ?

                          Thank you!

                            Comment

                            • howardc64
                              Badcaps Veteran
                              • Jun 2017
                              • 492
                              • United States
                              #8
                              Re: Sony Bravia KDL-46EX621 10 blinks

                              Originally posted by jphung99
                              Hi!
                              I recently have this same problem. Has anyone able to resolve this ?
                              Here is p35 of the service manual. Review a few pages on how to collect the blink code and which area of failure it points to

                              https://servicemanuals.us/sony/tv/kd....html?start=40

                                Comment

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