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Philips 50PUT6400/12 no backlight

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    #21
    Re: Philips 50PUT6400/12 no backlight

    Best to replace them all
    or buy new strips

    Not worth the hassle just to do the bad ones..

    Comment


      #22
      Re: Philips 50PUT6400/12 no backlight

      I totally agree with replacing them all.

      Comment


        #23
        Re: Philips 50PUT6400/12 no backlight

        Replaced blown leds with some i had but seems not quite right.
        Replacements were supposed to be:
        3030 3v 1w
        Vf 3.05-3.65v (250mA)
        6000-6500K
        120-130lm

        but then chinese imports so who knows what they actually sent.

        Think the colour temp is wrong, could see the difference before re-fitting but just wanted to see how it would look with panel back on. Not actually that noticeable whilst colours on the screen, its when its a greyish or white screen.

        The black band across the top is of course where an led has gone out again, perhaps poor soldering, underated mA or just cheapo crud. Or could be another 'old' led gone out.
        Attached Files
        Last edited by notallbad; 10-22-2018, 06:57 PM.

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          #24
          Re: Philips 50PUT6400/12 no backlight

          Originally posted by budm View Post
          Do you have picture of the bacside of the LED showing the solder pad pattern? You also need to find out if the big pad is Anode or Cathode.
          Small pad is anode +
          Large pad is cathode -

          Comment


            #25
            Re: Philips 50PUT6400/12 no backlight

            LG Inotek LED has Large pad as Anode.
            Most Samsung LED backlights have Large pad as Cathode.
            Did you use cool white 7000K?
            Last edited by budm; 10-22-2018, 07:14 PM.
            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


              #26
              Re: Philips 50PUT6400/12 no backlight

              cold white 6000-6500k, at least thats what they were advertised as.
              Last edited by notallbad; 10-22-2018, 07:29 PM.

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                #27
                Re: Philips 50PUT6400/12 no backlight

                Originally posted by notallbad View Post
                cold white 6000-6500k, at least thats what they were advertised as.
                sounds like the ones i have previously tried to fit and noticed the color issue too,i have recently ordered these and will give them a try
                https://www.ebay.co.uk/itm/Backlight...72.m2749.l2649
                Last edited by vinceroger69; 10-23-2018, 04:33 AM.

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                  #28
                  Re: Philips 50PUT6400/12 no backlight

                  that black band looks like tab driver is damaged

                  Comment


                    #29
                    Re: Philips 50PUT6400/12 no backlight

                    Originally posted by vinceroger69 View Post
                    sounds like the ones i have previously tried to fit and noticed the color issue too,i have recently ordered these and will give them a try
                    https://www.ebay.co.uk/itm/Backlight...72.m2749.l2649
                    Funnily enough I ordered some of those earlier today, from a different supplier mind you and paid a slightly higher price for mine though, but will still have to wait around 4-6 wks delivery time.

                    Be interested to hear how they compare to your last attempt!
                    Last edited by notallbad; 10-24-2018, 11:51 AM.

                    Comment


                      #30
                      Re: Philips 50PUT6400/12 no backlight

                      Originally posted by zomi View Post
                      that black band looks like tab driver is damaged
                      Definately due to led's fortunately.

                      Comment


                        #31
                        Re: Philips 50PUT6400/12 no backlight

                        Originally posted by vinceroger69 View Post
                        sounds like the ones i have previously tried to fit and noticed the color issue too,i have recently ordered these and will give them a try
                        https://www.ebay.co.uk/itm/Backlight...72.m2749.l2649
                        Did you get a chance to try these ones?

                        Mine arrived today but look very similar to the ones I have already replaced so think I will have the same problem.

                        Of course, I won't know for sure until I actually swap them over and power it up once its all put back together, not sure I'm prepared to go that far just yet!7
                        Last edited by notallbad; 11-01-2018, 01:29 PM.

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                          #32
                          Re: Philips 50PUT6400/12 no backlight

                          no mine have not arrived as yet and i have not got a led set here now for repair just two ccfl backlit ones.

                          Comment


                            #33
                            Re: Philips 50PUT6400/12 no backlight

                            Originally posted by vinceroger69 View Post
                            if you send this ebay seller a message im sure he will help you hes very helpful and a lot of us on here use his shop https://www.ebay.co.uk/usr/microtech...88.m1543.l2754

                            Update :

                            Thanks, just what was needed.

                            Highly recommended!

                            TV now working again.

                            Comment


                              #34
                              Re: Philips 50PUT6400/12 no backlight

                              Hi

                              I think I may have the same issues but I'm only reading 60 volts on the +VLED and 0 on the -VLED. Do you still think it is an LED that is blown?

                              Comment


                                #35
                                Re: Philips 50PUT6400/12 no backlight

                                I have almost same problem but with 49pus6561/12.
                                Sound works, ambient lighting works, with flashlight I see picture.
                                So its backlight issue.
                                I measured +VLED to chasis GND and its 57v
                                When measuring -VLED to +VLED I see voltage between 8v - 60v. the voltage goes light up, down up down up down.
                                Even when backlight connector is removed. I also hear something clicking but cannot find or feel what it is.
                                Is this job for new PSU?

                                Comment

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