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Samsung UN40D6400UFXZA Power Cycles

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    #41
    Re: Samsung UN40D6400UFXZA Power Cycles

    Don't know if I should try spending $90 on a main board for a 40" lcd

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      #42
      Re: Samsung UN40D6400UFXZA Power Cycles

      If you had to guess at which board to try would it be the tcon or main board?

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        #43
        Re: Samsung UN40D6400UFXZA Power Cycles

        Figured out the problem in my case. The LEDs. I have started a separate thread.

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          #44
          Re: Samsung UN40D6400UFXZA Power Cycles

          Hi , have you found the problem of Samsung tv ( power cycles ) ? my TV has the same issue .

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            #45
            Re: Samsung UN40D6400UFXZA Power Cycles

            In my case it was burned out LEDs.

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              #46
              Re: Samsung UN40D6400UFXZA Power Cycles

              Thanks Malachi .

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                #47
                Re: Samsung UN40D6400UFXZA Power Cycles

                I have found an LED open circuit on backlight after replaced TV work again . Thank you for your tip . This will help someone have the same problem .

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                  #48
                  Re: Samsung UN40D6400UFXZA Power Cycles

                  Ok so I had a problem with this Power board and t turned to to be cold solder joints.
                  Using the shop jimmy pic provided earlier in this thread I re-flowed all the joints highlighted and it fixed my clicking problem. I hope this helps someone in a similar situation.
                  Thanks for all the info.

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                    #49
                    Re: Samsung UN40D6400UFXZA Power Cycles

                    Hi Twilliard, were you able to resolve the issue, what was the solution?

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                      #50
                      Re: Samsung UN40D6400UFXZA Power Cycles

                      Hi! I decided so share my experience with this power cycling issue on a UN40D6400UFXZA Samsung led smart tv.
                      So i had a cycling issue with this tv, when i turned on the tv only a smart logo was shown for a half a sec and the tv was cycling to the eternity.
                      In my case was a faulty led. When i disassembled the tv, i found a single led on the strip, which is came off just by touch. So basically just shorted the led pads with a big solder blob and end of story. The tv working fine ever since.

                      But the most valuable hint when it comes to repair this kind of tvs, especially if u have power cycling issue, is that u need to find in the datasheet (yes datasheeet is crucial if u want to troubleshoot your tv, or at least get a similar one).

                      So every led tv has one or more led strip driving ics. This tv has 2. Every led driver ic has a FLAG pin which goes to the main board. That flag pin is going high (i believe - did not tested) if there is too much or too less curent was flowing to the led strip.
                      So just break the flag line ( take out a resistor) and the power cycling should stop (of course if your problem is about the led strips).
                      After that u can turn on your tv, and check which led strip is not lighting up. Also u can check the voltage on the output capacitors ( if one of your led strip is not lighting up the in the corresponding capacitor u will have much more voltage than on the other ones).

                      Well i hope i helped a bit!

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