Proscan PLDED3992A-C led failure?

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  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #21
    Re: Proscan PLDED3992A-C led failure?

    You can now use your led tester to find where the problem is with the top led strip.
    Willing to help but I'm no expert.

    Comment

    • jose6326
      Badcaps Veteran
      • May 2013
      • 707
      • USA

      #22
      Re: Proscan PLDED3992A-C led failure?

      Originally posted by dick_barton
      You can now use your led tester to find where the problem is with the top led strip.
      how????

      i disconnected the top LED strip and probed it with tester and the strip does not light up

      i did the same with the other strips and they do light up

      do i have to de-solder the LEDs?

      Comment

      • dskall
        Badcaps Legend
        • Oct 2016
        • 2905
        • usa

        #23
        Re: Proscan PLDED3992A-C led failure?

        You will have to probe through coating around each one. Trial and error to find +and- for each led. You don't need to check each led if you are going to replace strip.
        Last edited by dskall; 06-08-2017, 04:15 PM.
        I assume no responsibility for any stupid suggestions I might post.

        Comment

        • jose6326
          Badcaps Veteran
          • May 2013
          • 707
          • USA

          #24
          Re: Proscan PLDED3992A-C led failure?

          I cant find replacement strips so i will replace the individual faulty leds.

          I removed the diffusers and tested each led

          I think i found the faulty led on the end.
          Plus the burn mark on the back of the strip is probably a good indicator lol
          Attached Files

          Comment

          • jose6326
            Badcaps Veteran
            • May 2013
            • 707
            • USA

            #25
            Re: Proscan PLDED3992A-C led failure?

            At what temperature and air speed do you use the hot air gun on the rework station?

            Comment

            • dskall
              Badcaps Legend
              • Oct 2016
              • 2905
              • usa

              #26
              Re: Proscan PLDED3992A-C led failure?

              I use around 260c. With strips off the panel you can heat from bottom. I leave strips attached and heat from top. You just want to minimize heating led itself and melting. I heat strip till solder on pads melt and then drop led on and heat a couple more seconds. I also replace lens with led lit so I can center it over led so you minimize bright spots on screen.
              I assume no responsibility for any stupid suggestions I might post.

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #27
                Re: Proscan PLDED3992A-C led failure?

                If you warm up the led strip it helps to soften the glue sticking it to the metal chassis.
                I heat up from underneath the faulty led using the hot air gun but basically identical to

                https://www.youtube.com/watch?v=EZVQKEp6jxk
                Last edited by dick_barton; 06-09-2017, 03:03 AM.
                Willing to help but I'm no expert.

                Comment

                • jose6326
                  Badcaps Veteran
                  • May 2013
                  • 707
                  • USA

                  #28
                  Re: Proscan PLDED3992A-C led failure?

                  i tried using the heat gun and it didnt work

                  i was afraid of using to high of a temp and possibly damaging the strip

                  but i will try again

                  thanks for the help

                  Comment

                  • dskall
                    Badcaps Legend
                    • Oct 2016
                    • 2905
                    • usa

                    #29
                    Re: Proscan PLDED3992A-C led failure?

                    Some leds weld themselves to the pads and may be difficult to remove. The strips are pretty heat tolerant.
                    I assume no responsibility for any stupid suggestions I might post.

                    Comment

                    • jose6326
                      Badcaps Veteran
                      • May 2013
                      • 707
                      • USA

                      #30
                      Re: Proscan PLDED3992A-C led failure?

                      i was able to get it off.
                      i had to raise the temp and lower the fan speed. i did burn it a little more but not bad



                      thanks

                      Comment

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