Sony xbr-75x900f 6 red blink

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  • Diah
    Badcaps Legend
    • Feb 2013
    • 6358
    • Germany

    #101
    Re: Sony xbr-75x900f 6 red blink

    i dont believe on seller what he say.... its make no sense at all... 11 & 12 are same as 10 & 9 no stupid manufacture let 2 strips different from others..

    look on the 12 Left and the other 12 Right.... are there LED mounted in reserve way... if NO... then yours strips for 11 % 12 not correct or need to test the points of 11 & 12 on LED driver boards as R to chassis and compare them with 10 & 9... of course the ribbon cable should be disconnected from the boards at testing
    Attached Files

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    • EazyBone
      Badcaps Legend
      • Jun 2023
      • 1317
      • United states

      #102
      Re: Sony xbr-75x900f 6 red blink

      So the cycle goes this. I have tester on bl err pin. I plug in TV. Bl err goes to .65 volts for about 5 seconds (without touching anything) then drops to zero. I hit the power button, bl err goes from zero to .65 volts. One of the power supplies clicks and then goes to 3.3volts. All other voltages are correct. The backlights never turn on or even flash ever. The LD psu never supplies voltages to the LED driver board ever. None of this ever changes no matter what cables I disconnect. One at a time bl cable disconnect and nothing happens. All BL lights originally lit up before I changed them. All BL lights light up now.

      And to diah, yes all strips are exactly the same l and r. When I put the strips in, I have to flip the strips upside down.

      I don't know how to test them. Do I just unplug them and test each of those 5 copper pads for voltage.
      Last edited by EazyBone; 10-03-2023, 11:44 AM.

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6358
        • Germany

        #103
        Re: Sony xbr-75x900f 6 red blink

        to clear my understanding..... with flip them 11 & 12 up down they light up all correct ?

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6358
          • Germany

          #104
          Re: Sony xbr-75x900f 6 red blink

          about 11 & 12 the cable could be flipped some where we cant see... so the pin on top of LED boards NO 1 will be last at strips. this only explain if all strips are same L & R

          but
          one things possible... you need to inspect all the ribbon cable contact pins of the strips... you plugged them but the pins are down side so you cant see them if they are in good shape,,, thought the heat of the LED make them dry fast and easily get out from it place or broken.. so give time to inspect them carefully

          Comment

          • EazyBone
            Badcaps Legend
            • Jun 2023
            • 1317
            • United states

            #105
            Re: Sony xbr-75x900f 6 red blink

            Originally posted by Diah
            to clear my understanding..... with flip them 11 & 12 up down they light up all correct ?
            Nothing lights up ever. Per the service manual 6 blink says backlight but the error thing underneath it says it's the power board LCD screen or main board. And more likely the power board... so am I looking in wrong spot. I can't get the second power board to supply 70v to the LED driver board.
            Attached Files

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            • Diah
              Badcaps Legend
              • Feb 2013
              • 6358
              • Germany

              #106
              Re: Sony xbr-75x900f 6 red blink

              Originally posted by EazyBone

              I don't know how to test them. Do I just unplug them and test each of those 5 copper pads for voltage.
              no needs volts... read my last post.... and this pads just compare them with chassis as resistance

              Comment

              • EazyBone
                Badcaps Legend
                • Jun 2023
                • 1317
                • United states

                #107
                Re: Sony xbr-75x900f 6 red blink

                Originally posted by Diah
                no needs volts... read my last post.... and this pads just compare them with chassis as resistance
                Ahh okay, I will test all of them.

                Did you see the error diagnosis thing? Says panel, or power board first. Second is main board third being back light possibly.

                When no main or panel is even connected it still does the same thing. I'm going to test the chassis and resistance to all as you said but gonna look into this power board

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6358
                  • Germany

                  #108
                  Re: Sony xbr-75x900f 6 red blink

                  Originally posted by EazyBone
                  Ahh okay, I will test all of them.

                  Did you see the error diagnosis thing? Says panel, or power board first. Second is main board third being back light possibly.

                  When no main or panel is even connected it still does the same thing. I'm going to test the chassis and resistance to all as you said but gonna look into this power board
                  Man... yours statement... all old BL was light on.. you replace them all and since no BL you have..... so how it come other parts get defect... yes i could be if you wasn't wearing earthing arm band when you working on the TV... but this caused in rate 0.1 %.. so check yours Strips ribbon cable the contact pins first....
                  trouble shooting should be dome from the bottom then to the top / boards of the TV

                  Comment

                  • EazyBone
                    Badcaps Legend
                    • Jun 2023
                    • 1317
                    • United states

                    #109
                    Re: Sony xbr-75x900f 6 red blink

                    All old backlights lit up with tester yes. But this was the original problem. I'm already down to the lights so I'm gonna do every check you say first lol. I'm with you here, I just noticed since I am reading manual that it says power board is all. But I will check resistance on everything.

                    Thx for spending time to respond diah, will get rest of data in a bit!

                    Comment

                    • EazyBone
                      Badcaps Legend
                      • Jun 2023
                      • 1317
                      • United states

                      #110
                      Re: Sony xbr-75x900f 6 red blink

                      All read OL with chassis and positive to each pad. This is what you mean correct
                      Attached Files

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                      • Diah
                        Badcaps Legend
                        • Feb 2013
                        • 6358
                        • Germany

                        #111
                        Re: Sony xbr-75x900f 6 red blink

                        Originally posted by EazyBone
                        All read OL with chassis and positive to each pad. This is what you mean correct
                        on which Ohm level you did testing?

                        Comment

                        • Diah
                          Badcaps Legend
                          • Feb 2013
                          • 6358
                          • Germany

                          #112
                          Re: Sony xbr-75x900f 6 red blink

                          in case only if you did check all Strips ribbon cable contact pins are fine,,, we will move to power boards...
                          you need to test the PWB as stand alone... so it go
                          yours standby V. as i can read from photo are low 3.3 V some things.. so we do the following
                          1- jumper STB to Power on ( this should the SMPS on Hot area go high... and Voltage to the MB exists

                          2- jumper No 1 always should in place ... we make other jumper STB to T-CON _ON... the pins of T-CON 12V should exist
                          and STB via 1K Ohm to BL DIM.... here should BL come on... if not check V on LED power broads if it go high and provide V to LED driver-
                          3- both 1- & 2 should in place we do jumpers STB ..... to BL _ON.......

                          forget to add the socket between Power boards and Main boards should disconnected
                          Attached Files
                          Last edited by Diah; 10-03-2023, 02:17 PM.

                          Comment

                          • EazyBone
                            Badcaps Legend
                            • Jun 2023
                            • 1317
                            • United states

                            #113
                            Re: Sony xbr-75x900f 6 red blink

                            Power board mystery solved

                            Circled in red blew up. Wish I had known that 6 blinks means backlight failure but is most likely power board before lol. Well now we know
                            Attached Files
                            Last edited by EazyBone; 10-03-2023, 02:20 PM.

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                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6358
                              • Germany

                              #114
                              Re: Sony xbr-75x900f 6 red blink

                              hahahaha.... all this 6 pages and you never take the PWB out ....lol

                              Comment

                              • EazyBone
                                Badcaps Legend
                                • Jun 2023
                                • 1317
                                • United states

                                #115
                                Re: Sony xbr-75x900f 6 red blink

                                Originally posted by Diah
                                hahahaha.... all this 6 pages and you never take the PWB out ....lol
                                Yea lol . Sometimes you go backwards when you move forwards. Appreciate all the help, slightly expensive mistake but in the end it will only be $120 to fix TV and it was free lol. I learn from my mistakes it won't happen again

                                Comment

                                • Diah
                                  Badcaps Legend
                                  • Feb 2013
                                  • 6358
                                  • Germany

                                  #116
                                  Re: Sony xbr-75x900f 6 red blink

                                  Originally posted by EazyBone
                                  Yea lol . Sometimes you go backwards when you move forwards. Appreciate all the help, slightly expensive mistake but in the end it will only be $120 to fix TV and it was free lol. I learn from my mistakes it won't happen again
                                  compare yours last photo of plowing with first post you added photo... seem different to me

                                  Comment

                                  • Storyteller12
                                    Badcaps Veteran
                                    • Jun 2020
                                    • 624
                                    • USA

                                    #117
                                    Re: Sony xbr-75x900f 6 red blink

                                    If you did the test I mentioned and nothing happened then the blue board (led driver board) is bad

                                    Comment

                                    • EazyBone
                                      Badcaps Legend
                                      • Jun 2023
                                      • 1317
                                      • United states

                                      #118
                                      Re: Sony xbr-75x900f 6 red blink

                                      I'll eat crow. Yea the LED PSU is blown up. I'll find out in a few days.

                                      Comment

                                      • nomoresonys
                                        Badcaps Legend
                                        • Jan 2013
                                        • 12137
                                        • U.S.

                                        #119
                                        Re: Sony xbr-75x900f 6 red blink

                                        Yep, this is why I get that powerboard out and look it over right away, I always check the solder joints too, just in case it's something simple like this. https://www.youtube.com/watch?v=AynXoLjYrKc
                                        Last edited by nomoresonys; 10-03-2023, 04:33 PM.

                                        Comment

                                        • nomoresonys
                                          Badcaps Legend
                                          • Jan 2013
                                          • 12137
                                          • U.S.

                                          #120
                                          Re: Sony xbr-75x900f 6 red blink

                                          Lol, we all dropped the ball on this one, from first post the powerboard is suspect and nobody said well yank it out and look it over front and back.

                                          Comment

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