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Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

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    #21
    Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

    ugh so its still power cycling, AND the backlights are broken again. its just too hard to solder these back in, the way theyre set up. theres nothing stopping them from getting flexed off. dumbest design ever. the other ones are flat against a metal plate, way less chance of breaking off.
    anyway i got the panel apart again and im thinking of just replacing those 2 failed LED's with a resistor to complete the circuit. what resistor do i have to use to replace 2 LED's.
    if the LED's are 2.7v each i need a 5.4v drop before connecting back to the cathode return. what is the formula to figure out what resistor i need?

    i feel like i should know this already but i guess i havent done it. ive replaced LED's with other LED's but never given up and just done the resistor thing.. or am i supposed to use a diode?
    Last edited by triplefour; 03-16-2018, 11:47 PM.
    Don't fear the repair...

    Comment


      #22
      Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

      No. Don't use suction cups. Ever. A high chance of damage. Really no need on a 46" anyway.
      I use a fingernail in the middle of the screen to flick the screen up to vertical them I can hold it in both corners to move and store upright. I wear latex gloves so as not to have to worry about fingerprints.

      I use a hotplate to replace LEDS not a soldering iron, far easier and neater.
      It's a diode you replace it with not a resistor.
      Last edited by diif; 03-16-2018, 11:53 PM.

      Comment


        #23
        Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

        You need 5 diodes in series to get the Vf of about 3V (White LED WITH 300mA of current will have Vf just above 3V. Those diodes will get quite hot.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment


          #24
          Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

          there really isnt room for 10 diodes in series to be soldered in there...
          and dont diodes come in different sizes and shapes and different vf's?
          Don't fear the repair...

          Comment


            #25
            Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

            Originally posted by triplefour View Post
            there really isnt room for 10 diodes in series to be soldered in there...
            and dont diodes come in different sizes and shapes and different vf's?
            Yes, but the energy has to go somwhere. The ones that have the best vf also emit light.

            Comment


              #26
              Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

              Originally posted by triplefour View Post
              there really isnt room for 10 diodes in series to be soldered in there...
              and dont diodes come in different sizes and shapes and different vf's?
              That is why you should replace the LED instead of using the Diodes.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment


                #27
                Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                i think i will just replace these 2 leds with other LEDS that lay flat
                Don't fear the repair...

                Comment


                  #28
                  Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                  ok so i ended up replacing the 2 LED's with one that has a vf of 6v. i soldered a bit of braided copper wire to each pad on the LED, then soldered it to the strip, skipping one set of pads, but connecting the circuit. it aint pretty but it works! hopefully it will survive.

                  i probably could have done this with the orginal LEDS that broke off, but it would have been harder to solder them without bridging. plus i beat them up so bad trying to do it surface mount style, that i kinda dont trust em.

                  i think ill slip some tape underneath that wire so it cant come down and touch pads
                  Attached Files
                  Last edited by triplefour; 03-17-2018, 11:51 PM.
                  Don't fear the repair...

                  Comment


                    #29
                    Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                    Man! they sure use poor thermal management by using just the big solder pad of the LED to transfer the heat to the PCB, they should have heatsink to transfer the heat away from the LEDs. They are made to fail for sure.
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment


                      #30
                      Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                      this is without a doubt the worst edge lit led design ever. theyd have to really try to make something more likely to fail than this. but ill cross my fingers for now. the tv is on and running.. looks great! all LED's are on


                      ..but i suspect ill see it going into power cycling mode in a few hours :/

                      at least it wont be because of the backlights!
                      Last edited by triplefour; 03-18-2018, 12:54 AM.
                      Don't fear the repair...

                      Comment


                        #31
                        Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                        well i was right, it did start power cycling again after about 3 hours of flawless performance. i unplugged the mainboard to isolate just the psu and backlights, and this resulted in a flickering backlight with an erratic pattern. with the mainboard plugged in, the backlight comes on long enough to see SMART TV on the screen, or not at all, and then the set reboots.
                        letting it rest for an hour didnt change anything.
                        letting it rest overnight brought it back to "normal"
                        probably get another 3 hours out of it before it starts doing its thing, and then i guess ill try to get some voltage readings while its cycling...
                        Don't fear the repair...

                        Comment


                          #32
                          Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                          i bought a un46es7500f version of this tv yesterday and 4 pairs of glasses for it for 25 bux, has exactly the same problem yours does, person i bought it off of had it 6 months and broke several times on them, had the main/power/wifi board replaced under warrenty, never fixed the problem so they basically put the tv away and never used it

                          i took it home plugged it in, worked perfect for an hour then started randomly rebooting, been researching and havent been able to find anywhere that narrowed it down to one thing but i did find a youtube video today of a guy had the same problem and he said to unplug the 2nd ribbon cable from the bottom on the main board, i assume it has something to do with the wifi/bluetooth because tv doesnt pick up wireless now and my 3d glasses wont connect to tv(those might be something im doing wrong, hadn't tried to connect them till now) but the tv has been working flawlessly now for 3 hours

                          attached a pic of the plug i undone
                          Attached Files

                          Comment


                            #33
                            Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                            thanks for the input. but my tv does it even with the mb disconnected from the PSU so im fairly sure i have a fault somewhere on the PSU but it takes hours to build up
                            Don't fear the repair...

                            Comment


                              #34
                              Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                              That is when a can of freeze spray is your best friend to isolate if it is in fact a problem on the power supply board. I will start with freezing the LED controller IC. Do this after the 3 hours at the TV has been on and it starts acting up then what you do is look for the IC and spray it turn and TV back on and see if it comes back to normal
                              Did I leave the soldering iron on?

                              Comment


                                #35
                                Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                                ive tried this before and it always condensates water all over the board. isnt that dangerous as it will bridge connections?
                                Don't fear the repair...

                                Comment


                                  #36
                                  Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                                  i cant find my freeze spray right now but here's some pics of the only IC i could find, and a couple of other things that have numbers on them. super hard to read
                                  especially the IC, it has some kind of glue on it or something
                                  Attached Files
                                  Don't fear the repair...

                                  Comment


                                    #37
                                    Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                                    Yeah that's the LED controller IC. I had the 40 inch version of this TV that had a very similar issue except it was flickering the backlight always upon start up or disconnecting the main board. I replaced that IC and it fixed the problem.
                                    Did I leave the soldering iron on?

                                    Comment


                                      #38
                                      Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                                      do you have it logged somewhere, what the numbers on the iC are, or even better, a link to where i can buy it?
                                      Don't fear the repair...

                                      Comment


                                        #39
                                        Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                                        pretty useless but heres the "service manual" ...more like user manual...no electrical diagrams.
                                        Attached Files
                                        Don't fear the repair...

                                        Comment


                                          #40
                                          Re: Samsung UN46ES6150F starts power cycling after 2 hours of use from a cold start

                                          i really cant read the markings on that IC. the first line is totally obscured, and the best i can make out of the second line is D3385BGP which gets me nowhere. i see the board for sale on ebay for 30$ and am tempted to just "give up" and replace the board, but i have the tools and the skill to replace the IC if i only knew what it was! im sure it would be cheaper and more fulfilling (and more environmentally friendly) if i could repair the board.
                                          Don't fear the repair...

                                          Comment

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