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Samsung UN65MU6500FXZA won't turn on

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    Samsung UN65MU6500FXZA won't turn on

    hello all I hope someone can help me troubleshoot my TV. It's a 4K curved only 2 years old. The power supply is a BN44-00808E.

    Symptoms:
    Nothing happens when power button is hit. I opened up the back and have poked around and there is no voltage on the stand by pin on the power supply, but there is lots of other voltages that seen right but not for sure. If I unplug the connector going to the Main board the back light comes on, but as soon as I plug it back in the back light goes off. Nothing on the board looks bad. I'm suspecting there is a problem with the stand by circuit.

    any help would be much appreciated

    Thanks Mark
    Last edited by Rotorcraft230; 09-02-2019, 06:26 PM.
    Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

    #2
    Re: Samsung UN65MU6500FXZA won't turn on

    Trying to post pictures
    Attached Files
    Last edited by Rotorcraft230; 09-02-2019, 06:49 PM.
    Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

    Comment


      #3
      Re: Samsung UN65MU6500FXZA won't turn on

      Here are some pics of the power supply. The bar that says stay pwr is zero if this helps

      Thanks Mark
      Attached Files
      Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

      Comment


        #4
        Re: Samsung UN65MU6500FXZA won't turn on

        Seems like a faulty mainboard, do test 3 below, try to do it just like instructed.

        Comment


          #5
          Re: Samsung UN65MU6500FXZA won't turn on

          Means your main board isn't returning PSon to the PSU. Main board problem. Does the PWR LED light up on the front, you hit the power button and nothing is happening? May be a bad EEPROM on the main board.

          Symptoms EEPROM replacement MAY fix:
          - On screen display is stuck on logo screen
          - TV won’t power on with remote or buttons (LED indicator remains same color)
          - TV won’t turn on after being off for 30+ minutes
          - TV shuts off by itself during channel scan or when switching inputs
          - TV turns on and is stuck in color test pattern mode forever
          - TV turns on but there is no backlight (LED indicator shows TV is on but there is no image)

          Comment


            #6
            Re: Samsung UN65MU6500FXZA won't turn on

            Hello nomoresonys and CapLeaker, thanks for the replys I will do test 3. And CapLeaker there is no power LED when I hit the power button that I can see. I am not that familiar with this TV I am trying to help a friend. Where is the light located. I will go and do the test for you nomoresonys.
            Mark
            Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

            Comment


              #7
              Re: Samsung UN65MU6500FXZA won't turn on

              I see that you have backlights etc. with the main dissconnected so the power supply must be ok.
              Last edited by R_J; 09-02-2019, 07:36 PM.

              Comment


                #8
                Re: Samsung UN65MU6500FXZA won't turn on

                o.k. no power LED, then check the PSU first as per R J. If you know that power goes to the main board, then you need a main board replacement. The EEPROM will NOT fix your problem. The LED should be located at the bottom right underneath a bit recessed to the back. You should feel a "bump". Basically look under the TV bottom right.
                Last edited by CapLeaker; 09-02-2019, 07:30 PM.

                Comment


                  #9
                  Re: Samsung UN65MU6500FXZA won't turn on

                  Hi R_J j807 is 9.66VDC. the one above that is 0VDC
                  Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

                  Comment


                    #10
                    Re: Samsung UN65MU6500FXZA won't turn on

                    Pin #
                    1 FAIL COUNT 0
                    2 ANA-DIM 0
                    3 A13V 9.67
                    4 OD ON/OFF 0
                    5 A13V 9.67
                    6 BLU_PWM 0
                    7 A13V 9.67
                    8 POWER_ON/OFF .103
                    9 A13V 9.67
                    10 GND 0
                    11 GND 0
                    12 GND 0

                    All these measurements were the same with power button not activated and activated.

                    thanks Mark
                    Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

                    Comment


                      #11
                      Re: Samsung UN65MU6500FXZA won't turn on

                      Is that J807 9.66 volts with the mainboard connected or not? It should be around 7.5v in standby and then go up to 11.8v with Power_on/off (or with the main board disconnected)
                      I suspect the 9.66 is the standby voltage, so if you are not seeing the Power_on/off line voltage change when you push the power button, your fault IS on the man board and it could be a faulty eeprom, Shopjimmy does have them available so it can be the problem. (If you order one, get the correct one for your board)
                      Last edited by R_J; 09-02-2019, 07:48 PM.

                      Comment


                        #12
                        Re: Samsung UN65MU6500FXZA won't turn on

                        R_J, j807 is 9.67 with everything connected. if I disconnect the main board connector it goes to 12.84 and the back light comes on.
                        Mark
                        Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

                        Comment


                          #13
                          Re: Samsung UN65MU6500FXZA won't turn on

                          Ok, then that power supply is working like it should.

                          Comment


                            #14
                            Re: Samsung UN65MU6500FXZA won't turn on

                            I just want to confirm which board is bad before I buy one.
                            Mark
                            Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

                            Comment


                              #15
                              Re: Samsung UN65MU6500FXZA won't turn on

                              This might be it, try to match the BNxxx numbers on the white sticker on your mainboard or just contact them with your board details, they can tell you if it's a match: https://www.ebay.com/itm/Samsung-65-...oAAOSwKs1dUfd6
                              Last edited by nomoresonys; 09-02-2019, 08:26 PM.

                              Comment


                                #16
                                Re: Samsung UN65MU6500FXZA won't turn on

                                Hey thanks nomoresonys. There are lots in EBay the one you found isn't the same one my TV has but I appreciate you spending the time looking.
                                I just was wanting some guidance on diagnosing. Sounds like a main board problem. Here is the one from my TV
                                Attached Files
                                Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

                                Comment


                                  #17
                                  Re: Samsung UN65MU6500FXZA won't turn on

                                  BN94-12428A and BN94-11709A will both work.

                                  Comment


                                    #18
                                    Re: Samsung UN65MU6500FXZA won't turn on

                                    Ah sweet. I will shop for either one
                                    Thanks nomoresonys!!
                                    Mark
                                    Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9,

                                    Comment


                                      #19
                                      Re: Samsung UN65MU6500FXZA won't turn on

                                      Originally posted by Rotorcraft230 View Post
                                      Hey thanks nomoresonys. There are lots in EBay the one you found isn’t the same one my TV has but I appreciate you spending the time looking.
                                      I just was wanting some guidance on diagnosing. Sounds like a main board problem. Here is the one from my TV
                                      .
                                      Last edited by nomoresonys; 09-02-2019, 08:40 PM.

                                      Comment


                                        #20
                                        Re: Samsung UN65MU6500FXZA won't turn on

                                        Originally posted by Rotorcraft230 View Post
                                        Ah sweet. I will shop for either one
                                        Thanks nomoresonys!!
                                        Mark
                                        That IS the one you need, done this many many time, I would not steer you wrong.
                                        Last edited by nomoresonys; 09-02-2019, 08:43 PM.

                                        Comment

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