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    Samsung QE65Q7F no power

    Hi

    I'm looking for some advice with Samsung QE65Q7FNAT

    TV has no power.

    There are no lights on the One connect box to know if its the issue

    On the power supply of the one connect there are voltage points marked on the board. A11.8V which is present and a B332V which is not.
    Attached Files

    #2
    Re: Samsung QE65Q7F no power

    write here the connection pin out of one connect ps board.

    Comment


      #3
      Re: Samsung QE65Q7F no power

      The A11.8v is the standby voltage, The B332V is only supplied when the power supply is turned ON
      You need to check the PS_ON pin, this is the pin that turns ON the power supply by the main board.

      Comment


        #4
        Re: Samsung QE65Q7F no power

        whats one connect box to do with tv power or turn on??? with out it still tv turn on and off

        Comment


          #5
          Re: Samsung QE65Q7F no power

          .

          Comment


            #6
            Re: Samsung QE65Q7F no power

            Originally posted by davi.p View Post
            write here the connection pin out of one connect ps board.
            1.ir_smps
            2.fail_count
            3.ps_on
            4.power_low
            5.6 gnd
            7.8.9.10. A13v
            11.12.gnd
            13.14. Nc
            15.16. B350v
            17.18 nc
            19.20 b_gnd

            Comment


              #7
              Re: Samsung QE65Q7F no power

              Originally posted by Diah View Post
              whats one connect box to do with tv power or turn on??? with out it still tv turn on and off
              TV is powered from One connect box and cable. No direct power cable to TV

              Comment


                #8
                Re: Samsung QE65Q7F no power

                Originally posted by R_J View Post
                The A11.8v is the standby voltage, The B332V is only supplied when the power supply is turned ON
                You need to check the PS_ON pin, this is the pin that turns ON the power supply by the main board.
                NO voltage at PS_ON

                Is there a way to power up One connect without TV connected?

                Comment


                  #9
                  Re: Samsung QE65Q7F no power

                  So i think that you have a common problem for most of the tv, maybe a surge spike have ruined the content of a standby microcontroller or standby memory, that is probably a nor flash in large sop8 package, check them on main board.. to complete the diagnostic task take a 3v battery and connect it at gnd+ ps-on, then check the b350v
                  Last edited by Davi.p; 11-22-2022, 04:26 AM.

                  Comment


                    #10
                    Re: Samsung QE65Q7F no power

                    Originally posted by Davi.p View Post
                    So i think that you have a common problem for most of the tv, maybe a surge spike have ruined the content of a standby microcontroller or standby memory, that is probably a nor flash in large sop8 package, check them on main board.. to complete the diagnostic task take a 3v battery and connect it at gnd+ ps-on, then check the b350v
                    The 3V PS_on does then give the B350V.

                    Mainboard of connect box or TV?

                    Comment


                      #11
                      Re: Samsung QE65Q7F no power

                      I don't know, you must give hires photos of both , no flash, better bright sunlight

                      Comment


                        #12
                        Re: Samsung QE65Q7F no power

                        Originally posted by davph View Post
                        TV is powered from One connect box and cable. No direct power cable to TV
                        show us the whole back of the tv boards to know how this set working... especially the PSU to know what voltage exists and which pins. either the LED BL source feed.

                        Comment


                          #13
                          Re: Samsung QE65Q7F no power

                          I think the Cable from one connect to TV may be faulty or damaged.

                          I will update after trying another cable. TV is on wall, One connect box was easiest to check first.

                          Comment


                            #14
                            Re: Samsung QE65Q7F no power

                            Problem was with Cable between One Connect and tv. Looked ok but must have been have been damaged.

                            Comment


                              #15
                              Re: Samsung QE65Q7F no power

                              glad you sorted it out, that cable does go bad often.

                              Comment

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