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Samsung QE55Q85RAT bootloop

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    Samsung QE55Q85RAT bootloop

    Hi, I got this Samsung with One Connect box Q7, start to reboot after show on display the logo. I tried with another One connect box and still has bootloop.
    Now I took of the back cover of tv and inspected the boards and connectors.
    I did a reheat of the processor with hot air but still has same problem.
    What can I do to test the backlight ? It is a way to remove the protection?

    #2
    Re: Samsung QE55Q85RAT bootloop

    Try unplugging the cables going to the panel and see if the tv stays on. It won’t show a picture but if it stays on and doesn’t reboot its a problem with the panel.

    You can try the tape cutoff method if so

    Comment


      #3
      Re: Samsung QE55Q85RAT bootloop

      I believe unplugging power cable to main board should turn on backlights.
      I assume no responsibility for any stupid suggestions I might post.

      Comment


        #4
        Re: Samsung QE55Q85RAT bootloop

        Thank you so much for your help, I disconnected the panel and tv is starting with the welcome sound, the backlight staying on.
        So, I have a bad panel? What can I do ? Start to check for a bad cap on T-con board ?
        Attached Files

        Comment


          #5
          Re: Samsung QE55Q85RAT bootloop

          what side of tcon did you unhook? if panel side, then probably start checking small caps on panel driver board/s.

          Comment


            #6
            Re: Samsung QE55Q85RAT bootloop

            looks like you need to take some crap off to get to them.

            Comment


              #7
              Re: Samsung QE55Q85RAT bootloop

              Tv is on when half of panel is connected, no matter which ribbon cable , left or right, is connected with mainboard . When both ribbons are attached to the mainboard the tv is on bootloop and a strange sound, like a “buzzz” it's coming from the mainboard.
              Attached Files

              Comment


                #8
                Re: Samsung QE55Q85RAT bootloop

                Appears you have a voltage problem. Looks like t-con and mainboard all in one.
                I assume no responsibility for any stupid suggestions I might post.

                Comment


                  #9
                  Re: Samsung QE55Q85RAT bootloop

                  upload please high resolution focused photos of the LVDS socket left and right side on the Mainboards to reed to assignment of the pins

                  Comment


                    #10
                    Re: Samsung QE55Q85RAT bootloop

                    Can we get good clear pictures of the buffer boards.

                    Comment


                      #11
                      Re: Samsung QE55Q85RAT bootloop

                      Pictures
                      Attached Files

                      Comment


                        #12
                        Re: Samsung QE55Q85RAT bootloop

                        try to mask the exact pins on this socket and turn on.. notice if it stay on and display picture... if yes.. you have panel fault... if no result your issue on Main boards. good luck
                        Attached Files

                        Comment


                          #13
                          Re: Samsung QE55Q85RAT bootloop

                          Thank you Diah , I managed to mask the pins. Nothing is changed, still making the problem, restarting after displaying the logo
                          Attached Files

                          Comment


                            #14
                            Re: Samsung QE55Q85RAT bootloop

                            yours TV with external connect box ! did you try to disconnect it and turn on..

                            did you check if BL come on when you disconnect the socket between MB and PSU

                            Comment


                              #15
                              Re: Samsung QE55Q85RAT bootloop

                              First time I unplugged the cable link between one connect box and tv for one day, and disconnect the box from the mains, 240v .
                              Backlight inverter is powered by mainboard
                              Attached Files

                              Comment


                                #16
                                Re: Samsung QE55Q85RAT bootloop

                                Originally posted by tehmatix View Post
                                First time I unplugged the cable link between one connect box and tv for one day, and disconnect the box from the mains, 240v .
                                Backlight inverter is powered by mainboard
                                no way MB are involved with BL inverter VCC.. its only send dimm and BL on.
                                inverter VCC for BL recieved from PSU

                                Comment


                                  #17
                                  Re: Samsung QE55Q85RAT bootloop

                                  so testting by disconnect the Ribbon cable between MB and LED inverter... and disconnect the socket between MB and PSB and turn on notice if the BL lit dimm

                                  Comment


                                    #18
                                    Re: Samsung QE55Q85RAT bootloop

                                    we approved Panel Ok. and thought on MB. but now you need to consider on BL circuit starting from LEDs units,
                                    as your TV full array LED. so when it first boot there will be only about 12LED at the middle lighting up. after the boot of logo all LED should be lighting up. but here you have issue. so tv reboot.
                                    same case when you force the MB to turn on by disconnect one LVDS you hear buzzer.. this buzzer i do think it come from PCB or the inverter not MB.
                                    if you feel your self confident by take the panel self will be good start to be sure all LED are fine before you going to replace boards.

                                    Comment


                                      #19
                                      Re: Samsung QE55Q85RAT bootloop

                                      I would not own a tv with that damn box, just another way for lousy samsung to rake people for more money.

                                      Comment


                                        #20
                                        Re: Samsung QE55Q85RAT bootloop

                                        is the other one box the very same? also remember reading something was fishy with a lot of the cables that connect the box to the tv.

                                        Comment

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