Remove rear panel Sony Bravia KD-65X7500F

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  • viewerau
    Badcaps Veteran
    • May 2020
    • 305
    • Australia

    #81
    Re: Remove rear panel Sony Bravia KD-65X7500F

    I cannot get any indication of power in any way.

    The last time the tv worked, it would have been in standby mode, however, as it is now, there is no sign at all of life. It doesn't seem to respond to the power being turned on, a press of the power button on the back, or any presses of the remote control. It responds in no way whatsover....no flicker, no clicks.
    Signature:Seemingly hopeless tv fixer

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31002
      • Albion

      #82
      Re: Remove rear panel Sony Bravia KD-65X7500F

      did you try a differrent power cable?
      i know it sounds stupid, but you always assume nothing works till proven otherwise

      Comment

      • viewerau
        Badcaps Veteran
        • May 2020
        • 305
        • Australia

        #83
        Re: Remove rear panel Sony Bravia KD-65X7500F

        No I didn't, as the power cable is directly attached to the power supply board.
        Signature:Seemingly hopeless tv fixer

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12141
          • U.S.

          #84
          Re: Remove rear panel Sony Bravia KD-65X7500F

          Well see if you have the proper voltage where it attaches, if you can't get a measurement from the top, unplug everything from the powerboard, flip it over make sure you have the top part insulated from any metal, I just rest it on a piece of cardboard, plug the power cord in and check at solder joints.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #85
            Re: Remove rear panel Sony Bravia KD-65X7500F

            1) What DCV do you have on the main filter cap (yellow) C6524, measure right at the two legs of the cap?
            Be real careful since you are making measurement in the HOT DEADLY side of the circuit.
            2) You can also test the 3.3V standby Voltage by checking at the Cathodes of D6201 and chassis GND.
            3) Connector CN6401: You can test Voltages of the EVEN number pins on the top side of the board. the ODD number pin can be probed from the wire entrance side of the connector using skinny probe.
            Last edited by budm; 06-22-2020, 01:39 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

            • viewerau
              Badcaps Veteran
              • May 2020
              • 305
              • Australia

              #86
              Re: Remove rear panel Sony Bravia KD-65X7500F

              Thanks for the advice of where to check for power etc, but as I am not savvy enough to use the multimeter without killing myself, I am to scared to play with power on my own without supervision.

              I'll have to try to find someone local somehow to try your suggestions.

              Is it normally just either one of these two boards that end up being faulty, or do similar malfunction show up in other different parts of this telly too, to stop it from operating?

              I'd just once again like to thank all of you that are trying to assist me...
              Signature:Seemingly hopeless tv fixer

              Comment

              • mmartell
                Badcaps Legend
                • Oct 2013
                • 3189
                • Canada

                #87
                Re: Remove rear panel Sony Bravia KD-65X7500F

                You can test those voltages as indicated in #2 and #3 of budm's post without fear of killing yourself. Black probe on chassis (metal back or screw holding board down) red probe on each pin one at a time. Write them down.

                Comment

                • viewerau
                  Badcaps Veteran
                  • May 2020
                  • 305
                  • Australia

                  #88
                  Re: Remove rear panel Sony Bravia KD-65X7500F

                  Thanks very much for the added information.

                  I am going to try get a friend to help in the measurements, as I am too worried.

                  It may be a day or two to do so, as such, please standby for an additional post in due course.

                  If there is any other testings he should do, please let me know before I try get the help.

                  Many thanks as usual...
                  Signature:Seemingly hopeless tv fixer

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12141
                    • U.S.

                    #89
                    Re: Remove rear panel Sony Bravia KD-65X7500F

                    To be clear MUST BE VERY CAREFUL if testing the main filter cap they have high voltage and can KILL easily, NEVER touch them with your hands, even when tv has been off a while they can still have a deadly charge, they can carefully be discharged with a resistor, definitely get help, better safe than sorry.

                    Comment

                    • viewerau
                      Badcaps Veteran
                      • May 2020
                      • 305
                      • Australia

                      #90
                      Re: Remove rear panel Sony Bravia KD-65X7500F

                      Thanks for the warning...this is why I choose not to try....I thank you for the reminder...CHEERS
                      Signature:Seemingly hopeless tv fixer

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #91
                        Re: Remove rear panel Sony Bravia KD-65X7500F

                        At least plug t he TV into the GFCI outlet, these outlets are used in the bath room and kitchen.
                        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

                        • viewerau
                          Badcaps Veteran
                          • May 2020
                          • 305
                          • Australia

                          #92
                          Re: Remove rear panel Sony Bravia KD-65X7500F

                          If the power board checks out as ok, then where is the next checks to be conducted please? My helper is hoping to come on Sunday to help me out.

                          Thanks again.
                          Signature:Seemingly hopeless tv fixer

                          Comment

                          • nomoresonys
                            Badcaps Legend
                            • Jan 2013
                            • 12141
                            • U.S.

                            #93
                            Re: Remove rear panel Sony Bravia KD-65X7500F

                            Maybe check the diodes on powerboard see if any read bad, if so you can look closer at that part of the circuit to see if any other components might be giving the different reading while in circuit.
                            Last edited by nomoresonys; 06-24-2020, 08:51 PM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #94
                              Re: Remove rear panel Sony Bravia KD-65X7500F

                              Right now we need to find out if all the control Voltages and Voltages (switched Voltages and standby Voltage) are present or not then we will go from there.
                              May be you and your helper should also read the Basic LCD TV troubleshooting just to understand basic concept as to what TV needs to operate.
                              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

                              • viewerau
                                Badcaps Veteran
                                • May 2020
                                • 305
                                • Australia

                                #95
                                Re: Remove rear panel Sony Bravia KD-65X7500F

                                Ok.. budm...will do...many thanks again!!!!!!
                                Signature:Seemingly hopeless tv fixer

                                Comment

                                • chrismurphy
                                  Badcaps Veteran
                                  • May 2014
                                  • 251
                                  • australia

                                  #96
                                  Re: Remove rear panel Sony Bravia KD-65X7500F

                                  sorry to say you have a faulty main board
                                  Have done heaps of these and its always the main board , power supply's rarely fail

                                  Comment

                                  • viewerau
                                    Badcaps Veteran
                                    • May 2020
                                    • 305
                                    • Australia

                                    #97
                                    Re: Remove rear panel Sony Bravia KD-65X7500F

                                    My helper (Mick) came today to help out

                                    On the power board, there is no 3.3v on standby. This was measured with power supplied pressing the power on button on the back, as well as trying to turn it on via the remote.

                                    Will it give 3.3v simply connected to the power outlet, but not responding to the on off button or remote.?

                                    The rest of the 12 v pins on the main connector all were perfect.

                                    The big yellow cap had power, as did the 2 X caps at the bottom right of the board.

                                    So, still wondering why it will not show the 3.3 standby?

                                    Grrr
                                    Signature:Seemingly hopeless tv fixer

                                    Comment

                                    • nomoresonys
                                      Badcaps Legend
                                      • Jan 2013
                                      • 12141
                                      • U.S.

                                      #98
                                      Re: Remove rear panel Sony Bravia KD-65X7500F

                                      Is 12 volt even possible without standby voltage??

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #99
                                        Re: Remove rear panel Sony Bravia KD-65X7500F

                                        My post #85:
                                        "2) You can also test the 3.3V standby Voltage by checking at the Cathodes of D6201 and chassis GND."
                                        Did you do that test as requested?
                                        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

                                        • viewerau
                                          Badcaps Veteran
                                          • May 2020
                                          • 305
                                          • Australia

                                          #100
                                          Re: Remove rear panel Sony Bravia KD-65X7500F

                                          Hi,
                                          Will try for that again.
                                          Signature:Seemingly hopeless tv fixer

                                          Comment

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