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Interpreting Service Manual Troubleshooting Steps

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    Interpreting Service Manual Troubleshooting Steps

    Hello
    I'm troubleshooting a dead Sony XBR-65X810C.
    I was able to find a service manual from one of the posts here.
    I was able to get through the steps highlighted in yellow, but need some help with next steps. See attached Picture.
    Next step says:
    Check OPWRSB
    R9179 Voltage.
    Is the voltage 0V?

    and one after says:
    Check STBY_MHL
    R9176 Voltage.
    Is the voltage >3.0V?

    These are referring to the same resistor, what does OPWRSB and STBY_MHL stand for?
    I measured voltage on both ends of that resistor and got 0V (millivolts).
    Attached Files

    #2
    Re: Interpreting Service Manual Troubleshooting Steps

    So you have 3 volts on R9186?

    Comment


      #3
      Re: Interpreting Service Manual Troubleshooting Steps

      Yes 3.48v

      Comment


        #4
        Re: Interpreting Service Manual Troubleshooting Steps

        I don't know what "OPWRSB" stands for. It seems to refer to a control pin on a microprocessor in other manuals., without a schematic, it will be hard to trace the circuit, R9179 & R9176 don't seem to be the same resistor.
        If the voltage on R9179 IS 0 volts, then proceed to the YES and check Power_ON
        Last edited by R_J; 11-26-2020, 12:20 PM.

        Comment


          #5
          Re: Interpreting Service Manual Troubleshooting Steps

          You can find some information in this pdf
          OPWRSB - Power In On/OFF
          Attached Files
          Willing to help but I'm no expert.

          Comment


            #6
            Re: Interpreting Service Manual Troubleshooting Steps

            Thank you RJ, my bad, I read both Resistors as the same number, I actually checked R9176 and got 0V.
            So next step says:

            Check POWER_ON
            P-on ucom #pin19
            Is the voltage >3.0V?

            I'm not sure about this again, as there is no pin#19 on any of the boards that is named POWER_ON. I checked POWER_ON pin on the main board which is Pin#22 and Pin#9 on the Power board, they both have 3.5V.

            So that takes me to the next step:
            Check P_ON_LNB
            P-on ucom #pin15
            Is the voltage >3.0V?

            Again there is no Pin#15 on any boards that are called P-ON_LNB.
            But I searched the Service Manual for P-ON_LNB anywhere else and its on another troubleshooting tree referencing R9167.
            "Check P_ON_LNB signal line
            at R9167 = 3.3V?"
            So I checked R9167 and has 0V on both ends. So that would point to > Change IC9017.

            Any idea if I'm interpreting this correctly?
            If IC9017 is suspect, would you suggest I try to heat it up enough to re-flow the solder? Or I should be able to find a replacement.?

            Thank you for your help getting me this far.
            Cheers
            Attached Files

            Comment


              #7
              Re: Interpreting Service Manual Troubleshooting Steps

              Looks like that chip is a 20 pin, 8bit flash microcontroller made by Microchip
              https://cdn.badcaps-static.com/pdfs/...07d0b1414e.pdf
              and if it is then it most probably programmed by Sony

              It may well be that it supervises the power on sequence.
              Check it has its supply voltage on pin 1 (VDD)
              Last edited by dick_barton; 11-27-2020, 10:39 AM.
              Willing to help but I'm no expert.

              Comment


                #8
                Re: Interpreting Service Manual Troubleshooting Steps

                I believe these boards have a few smd fuses that would be worth checking, like F9005 (in the picture) I believe this fuse is next to the letters IC in IC9004

                I also see on shopjimmys site that these boards require a software update after replacing, so it is possible there is a software issue with the board.
                Last edited by R_J; 11-27-2020, 11:54 AM.

                Comment


                  #9
                  Re: Interpreting Service Manual Troubleshooting Steps

                  Sorry for the delay, I don't have much time to work on this.
                  THank you for your inputs.
                  I found maybe 7 or 8 fuses on the main board, all of them had either 12 or 5V on both sides of each fuse. So they are all good.
                  I also checked pin1 of IC9017 and it has 3.5V.
                  As far as software goes. When I plug a usb stick and plug the TV in it does not even light up, so its not reading anything.
                  Any other ideas I could try?

                  These boards are expensive and out of stock everywhere.
                  I found a place in Tuscon, AZ (Nicks TV Repair) who repairs these boards, for $185 +shipping.
                  This looks like the best option I found.

                  Comment


                    #10
                    Re: Interpreting Service Manual Troubleshooting Steps

                    BTW the board No. is A2072598B

                    Comment


                      #11
                      Re: Interpreting Service Manual Troubleshooting Steps

                      Have you tried a forced reboot?
                      At the start, unplug your SONY XBR-65X810C from the power source and wait for about 2 minutes. Now press and hold the Power button and Volume - button together on your SONY XBR-65X810C TV. Then plug the TV back into the power source. Wait until the LED light turns green, then release both buttons.

                      Comment


                        #12
                        Re: Interpreting Service Manual Troubleshooting Steps

                        I think I have tried this reboot, but may have not followed exactly as you said. So will try again and let you know.
                        Now currently I don't get any LEDs to come on at all.
                        thank you

                        Comment


                          #13
                          Re: Interpreting Service Manual Troubleshooting Steps

                          Plugged in with both buttons pressed and held for 2 minutes. No lights came on.

                          Comment


                            #14
                            Re: Interpreting Service Manual Troubleshooting Steps

                            Let's start from the begin, don't read service manuals for now, have you got time to repair this? Does tv makes any sign of life? If not detach the power board and test it at bench by forcing it on and better putting dummy loads.

                            Comment


                              #15
                              Re: Interpreting Service Manual Troubleshooting Steps

                              Hello Davi,
                              thank you for trying to help me out.
                              I'm good to start from the beginning.
                              I was not available for a while but I now have 2 weeks where I can work on this, and hope to get this fixed.

                              So I disconnected everything from the power board and got the following results.
                              Testing GL6 Power board
                              Main board connector disconnected
                              3.5 STDBY only
                              Main board connector connected
                              Pins:
                              AC_OFF_DET: 3.5V
                              POWER_ON: 3.5V
                              REG12V: 12.7V present
                              Pins: STDBY and Tcon_ON shorted
                              TCon_VCC12V: 12.7V

                              Backlights connector
                              Pins:
                              +OUT1: 98.6V
                              -OUT1: 0V
                              Pins: STDBY and BL ON shorted
                              Pins:
                              +OUT1: 220V
                              -OUT1: 80V
                              No Backlights ON

                              Not sure how to stimulate loads.
                              THanks again, hope you can still help.

                              Comment


                                #16
                                Re: Interpreting Service Manual Troubleshooting Steps

                                This indicates to me that Power board is OK, I'm just not sure about the Backlight outputs.

                                Comment


                                  #17
                                  Re: Interpreting Service Manual Troubleshooting Steps

                                  Pins: STDBY and BL ON shorted
                                  Pins:
                                  +OUT1: 220V
                                  -OUT1: 80V
                                  No Backlights ON

                                  That should be around 20V range, 80V is way too high.
                                  Is that measured with ref. to circuit ground?
                                  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


                                    #18
                                    Re: Interpreting Service Manual Troubleshooting Steps

                                    Thanks for your response.

                                    Yes ref. is ground.
                                    Would simulating some load help in troubleshooting the BL circuit?

                                    I just picked up an XBR55800G for free that powers up but has a broken screen.
                                    the main board is different but the power board looks identical, GL6 board,
                                    I;'ll check the numbers tomorrow when I open it up.

                                    Comment


                                      #19
                                      Re: Interpreting Service Manual Troubleshooting Steps

                                      Can I see the pictures of the whole backside of the TV showing all the boards so I can see what we are dealing with?
                                      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


                                        #20
                                        Re: Interpreting Service Manual Troubleshooting Steps

                                        Hello
                                        Pictures attached
                                        Attached Files

                                        Comment

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