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    #1

    Samsung UN40D6400 led problem

    I finally figured out what was wrong with this un40d6400 I purchased that was power cycling.
    Some of the leds arent lighting up. I dont know if its due to them being faulty or what.
    It is an edged lit led. Do I repleace all of them? Is there a way to test them? I have watched reecey's video and have doen that test on the back lit leds on a 50' emerson but this is different.
    Both sides work up to the same exact spot, marked with a purple sharpie
    The portion that is out is the top of the screeen.
    Attached Files
    Last edited by Malachi; 03-21-2016, 03:29 PM.
    Tags: None
    #2
    Re: Samsung UN40D6400 led problem

    I can't see why you can't test them. Are they the 4 leds in 1 package type?
    Willing to help but I'm no expert.

    Comment

      #3
      Re: Samsung UN40D6400 led problem

      I have no idea. I'm new at this. Should I take them off the TV?
      Last edited by Malachi; 03-21-2016, 04:07 PM.

      Comment

        #4
        Re: Samsung UN40D6400 led problem

        These are the numbers on the led strip but Google turns up nothing.
        2011svs40 6.5k v2 4ch pv left72
        109-219-15(12)

        Comment

          #5
          Re: Samsung UN40D6400 led problem

          you can find the strip
          or measure each led to see witch one is bad

          Comment

            #6
            Re: Samsung UN40D6400 led problem

            seeing that both strips don't light the last 1/3 section,I'm starting to wonder if it's not a driver issue. Often they drive them in groups of so many led's. To me it's a little too coincidental that both sides would be down at same point.
            You can trace out which wire does what group of led's and swap 2 wires in the connector to see if the "problem" section moves along with it. Or measure the wire on the dead group?

            Looking at the connectors,it seems to have 3 groups,(3 white wires in each connector). Unless a shorted/open led in that 1/3 section kills all of them?
            Last edited by martino; 03-21-2016, 10:23 PM.
            Proud owner of dozens of broken TV's and many,many,many boards.


            Our website and passion:http://hollenhundshepherds.com/

            Comment

              #7
              Re: Samsung UN40D6400 led problem

              What is a driver?

              Comment

                #8
                Re: Samsung UN40D6400 led problem

                Have you unplugged both connectors to the led strips and checked that you have the same voltage on all the pin, just in case you have lost a supply.
                Last edited by dick_barton; 03-22-2016, 04:33 AM.
                Willing to help but I'm no expert.

                Comment

                  #9
                  Re: Samsung UN40D6400 led problem

                  No. I don't now what I'm doing. This is really my first time trying to fix one of these.

                  Comment

                    #10
                    Re: Samsung UN40D6400 led problem

                    Measure the voltage on the pins of the connectors plugged into the led strips and see if one on each side has a lower or higher voltage than the rest.
                    Willing to help but I'm no expert.

                    Comment

                      #11
                      Re: Samsung UN40D6400 led problem

                      Ok thanks. I will do that when I get home.

                      Comment

                        #12
                        Re: Samsung UN40D6400 led problem

                        This is the connector on the led. Btw there are 72 LEDs on each strip. A left strip and a right one.

                        How exactly should I test them? If I plug it in the LEDs are blinding? I can't see what I'm doing.
                        Attached Files
                        Last edited by Malachi; 03-22-2016, 01:31 PM.

                        Comment

                          #13
                          Re: Samsung UN40D6400 led problem

                          I'm sure this is a problem everyone has when testing them. You know the fault is in the lower section of each strip so can you cover the working ones (but not too close so as they overheat) so they don't shine in your eyes.

                          What's the black mark on the connector?
                          Last edited by dick_barton; 03-22-2016, 01:45 PM.
                          Willing to help but I'm no expert.

                          Comment

                            #14
                            Re: Samsung UN40D6400 led problem

                            It's the upper section of the strips that dont work. The black mark was already there. It looks like a marker.
                            Do I hold my black lead on the chassis? Do I test every pin? Even the black and blue? What am I looking for voltage wise?

                            Here is a picture of where the led connectors plug into the psu.
                            Attached Files
                            Last edited by Malachi; 03-22-2016, 02:02 PM.

                            Comment

                              #15
                              Re: Samsung UN40D6400 led problem

                              https://www.badcaps.net/forum/attach...3&d=1458676923
                              There are charts showing the pins names of those two CNL801A, 801B connectors.
                              Can we see the chart without the wires in the way?
                              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

                                #16
                                Re: Samsung UN40D6400 led problem

                                did the left strip and right one share same socket? or each one goes to PSU separately.

                                socket on your photo hat 8 pins, and total are 72 as you wrote, need the photo of the out put on the PSU are there really 8 wiring on each socket?

                                okay, i saw the photo,

                                you have each side had 2 strip separate each one had 3 Group , each Group had 12 Diode

                                its 7030 6 Volts Diode,
                                Last edited by Diah; 03-22-2016, 02:14 PM.

                                Comment

                                  #17
                                  Re: Samsung UN40D6400 led problem

                                  Is this good enough?
                                  Attached Files

                                  Comment

                                    #18
                                    Re: Samsung UN40D6400 led problem

                                    Originally posted by Diah View Post
                                    did the left strip and right one share same socket? or each one goes to PSU separately.

                                    socket on your photo hat 8 pins, and total are 72 as you wrote, need the photo of the out put on the PSU are there really 8 wiring on each socket?
                                    Each strip is plugged into one separate socket on the psu. Yes, 8 wires each side.

                                    Comment

                                      #19
                                      Re: Samsung UN40D6400 led problem

                                      I was just measuring the pins plugged into the right side (with the blue wire) when budm asked for the picture.
                                      The blue wire had 118v when the led flashed on and the white wire below that 60v. That's as far as I got. I stop to take the picture.

                                      Comment

                                        #20
                                        Re: Samsung UN40D6400 led problem

                                        okay, i saw the photo,

                                        you have each side had 2 strip separate each one had 3 Group , each Group had 12 Diode

                                        its 7030 6 Volts Diode,

                                        Comment

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