Sony XBR65x900c No Power

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  • justintime_3
    New Member
    • Sep 2018
    • 8
    • USA

    #1

    Sony XBR65x900c No Power

    I was given a Sony XBR65x900c tv for free with no known condition. My house was struck by lightning last year so I have some experience replacing boards on TV's. So I purchased a board from ebay that was supposedly in new condition just had a broken screen. Installed the board and still nothing. I tested volts and the stand by voltage seems low at somewhere around 2.5 volts. Not sure if this is normal but open to suggestions on what to do next. Thanks
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Sony XBR65x900c No Power

    For us to help you, we will need good clear pictures of the whole backside of the TV showing all the boards, and the straight shot pictures of the whole top and bottom side of the power supply board so we can read the printed texts on the 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

    • justintime_3
      New Member
      • Sep 2018
      • 8
      • USA

      #3
      Re: Sony XBR65x900c No Power

      Okay thanks for the help. I have uploaded some pics and what the voltage was on them.
      Attached Files

      Comment

      • justintime_3
        New Member
        • Sep 2018
        • 8
        • USA

        #4
        Re: Sony XBR65x900c No Power

        And a couple more pics
        Attached Files

        Comment

        • R_J
          Badcaps Legend
          • Jun 2012
          • 9535
          • Canada

          #5
          Re: Sony XBR65x900c No Power

          So I purchased a board from ebay that was supposedly in new condition just had a broken screen. Installed the board and still nothing
          Which board? power supply or main?
          The standby voltage should be 3.3 volts, Is the stby voltage the same with the original board?
          Last edited by R_J; 09-05-2018, 10:13 PM.

          Comment

          • vinceroger69
            Badcaps Legend
            • Mar 2012
            • 6714
            • uk

            #6
            Re: Sony XBR65x900c No Power

            you say your house had a lightening strike a lot of times we see its the mainboard at fault as per above post what board did you replace?

            Comment

            • justintime_3
              New Member
              • Sep 2018
              • 8
              • USA

              #7
              Re: Sony XBR65x900c No Power

              Originally posted by R_J
              Which board? power supply or main?
              The standby voltage should be 3.3 volts, Is the stby voltage the same with the original board?
              I will have to check tonight. I didn't even check voltage as with my previous TV's i just replaced the board and it fixed the problem. I will check tonight and post results. And I replaced the large board on the left side, the board where the actual power cord plugs into so I would assume that would be the power board? I ordered the smaller board in the middle from ebay once again just to see if that fixes it. From the description listed they called it the static converter board?

              Comment

              • justintime_3
                New Member
                • Sep 2018
                • 8
                • USA

                #8
                Re: Sony XBR65x900c No Power

                Originally posted by vinceroger69
                you say your house had a lightening strike a lot of times we see its the mainboard at fault as per above post what board did you replace?
                So my house had been struck by lightning before but this tv has never worked since it was given to me so it has not been struck by lightning yet The board that I replaced had the power plugged directly into it so I am assuming its the power board but I really have no clue. I ordered what was called the static converter board off of ebay so we will see if that fixes it.

                Comment

                • Andrew F. Ali
                  Badcaps Legend
                  • Jan 2014
                  • 2450
                  • Trinidad & Tobago

                  #9
                  Re: Sony XBR65x900c No Power

                  Without measuring voltages on the Power and Main Bds. you are guessing and would just be replacing Bds hoping for a fix. I think you have a Main Bd problem though and you should invest in a DMM to check if the PS-ON signal is produced.

                  Comment

                  • vinceroger69
                    Badcaps Legend
                    • Mar 2012
                    • 6714
                    • uk

                    #10
                    Re: Sony XBR65x900c No Power

                    Originally posted by justintime_3
                    So my house had been struck by lightning before but this tv has never worked since it was given to me so it has not been struck by lightning yet The board that I replaced had the power plugged directly into it so I am assuming its the power board but I really have no clue. I ordered what was called the static converter board off of ebay so we will see if that fixes it.
                    sorry i missed read post 1 post a picture showing all the boards that are used in your set and maybe we can advise you more.

                    Comment

                    • justintime_3
                      New Member
                      • Sep 2018
                      • 8
                      • USA

                      #11
                      Re: Sony XBR65x900c No Power

                      Originally posted by Andrew F. Ali
                      Without measuring voltages on the Power and Main Bds. you are guessing and would just be replacing Bds hoping for a fix. I think you have a Main Bd problem though and you should invest in a DMM to check if the PS-ON signal is produced.
                      Pardon my ignorance but what is a DMM?

                      Comment

                      • vinceroger69
                        Badcaps Legend
                        • Mar 2012
                        • 6714
                        • uk

                        #12
                        Re: Sony XBR65x900c No Power

                        digital multi meter

                        Comment

                        • William1967
                          Badcaps Veteran
                          • Nov 2017
                          • 203
                          • Netherlands

                          #13
                          Re: Sony XBR65x900c No Power

                          What ground do you use?
                          2,5Volts for stand by is to low, disconnect the mainboard and check it again, if still to low the problem could be in the power supply.

                          Comment

                          • Andrew F. Ali
                            Badcaps Legend
                            • Jan 2014
                            • 2450
                            • Trinidad & Tobago

                            #14
                            Re: Sony XBR65x900c No Power

                            With your DMM you can measure WRT chassis GND if PS-ON toggles.

                            Comment

                            • justintime_3
                              New Member
                              • Sep 2018
                              • 8
                              • USA

                              #15
                              Re: Sony XBR65x900c No Power

                              Well I just have a basic multimeter as seen in the pics. The ground that I was using was just a chassis ground that you would mount to the wall hangar. Also the board that was in it originally had the same voltage as the replacement one from eBay so I am assuming the power board is not the problem.

                              Comment

                              • vinceroger69
                                Badcaps Legend
                                • Mar 2012
                                • 6714
                                • uk

                                #16
                                Re: Sony XBR65x900c No Power

                                ignore wrong thread sorry
                                Last edited by vinceroger69; 09-07-2018, 10:31 AM.

                                Comment

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