Samsung UN65KS8500F

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  • dbbaaker89
    New Member
    • Sep 2022
    • 4
    • United States
    #1

    Samsung UN65KS8500F

    Hey all,
    I cant get my TV to turn on properly. It has power, the red light is there and solid but when I press the power button, the screen looks like its about to turn on and then it goes black. Then without touching anything, the TV looks like it is power cycling, repeating this process of partially turning on and then off. I even walked away for an hour and it continued to do this the entire time.

    I've tried holding the power button down but that doesn't do anything. I've tried unplugging from wall and using different outlets but when I plug it back in (has power) the same process repeats when I try to turn it on.

    I contacted Samsung but they couldn't tell me anything other than I'll have to create a service ticket for it and pay close to what a new TV costs to repair it.

    Any ideas?

    I added a video (zip) hopefully you can view it of what's going on.
    Attached Files
    Last edited by dbbaaker89; 09-10-2022, 05:48 PM.
    Tags: None
    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12206
      • U.S.
      #2
      Re: Samsung UN65KS8500F

      unhook cable from powerboard to mainboard, leave it off, plug power cable back into powerboard, see if backlights come on and stay on.

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12206
          • U.S.
          #3
          Re: Samsung UN65KS8500F

          This one uses the one connect box right?

            Comment

            • dbbaaker89
              New Member
              • Sep 2022
              • 4
              • United States
              #4
              Re: Samsung UN65KS8500F

              TBH I'm not entirely sure what you mean with your instructions.
              But yes it has the One Connect box.
              Attached Files

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12206
                  • U.S.
                  #5
                  Re: Samsung UN65KS8500F

                  ok, I don't think you can fix this issue without taking the back off and doing some testing, might get lucky and see something obvious, otherwise will need at least a multimeter to do some basic testing, if you want to give it a go, post some good clear straight on pictures of each board and one of the whole back as to see how everything is connected.

                    Comment

                    • Davi.p
                      Hobbist Tech
                      • Sep 2009
                      • 4337
                      • Italy - Milan
                      #6
                      Re: Samsung UN65KS8500F

                      It can be a main board problem (bad standby software..), i don't know this model, maybe also bad panel's boards.. less probable bad soldering on CPU or secondary processors (bad i2c comunication).. i think if you aren't familiar with TV repairs, is better to try a replacement main board, this is my first bet (after making the backlight test)..
                      post front/rear photos of power board.. have you got a capacitor tester?
                      Last edited by Davi.p; 09-10-2022, 11:50 PM.

                        Comment

                        • dbbaaker89
                          New Member
                          • Sep 2022
                          • 4
                          • United States
                          #7
                          Re: Samsung UN65KS8500F

                          I do not have a capacitor tester

                            Comment

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