TCL 65C715 backlight issue

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  • Cornito
    Senior Member
    • Jan 2024
    • 90
    • France

    #21
    You mean that the BL ON signal is not sent to the PSU by the motherboard.

    BL ON is not so easy to take, but measured it and was present.

    I'll take the requested picture tomorrow.
    ​​​​​​Regards

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6355
      • Germany

      #22
      you are afraid of the glued screen..LOL.... i advised you to arrange space at your place and take out the screen and keep it in safe place,, to have access to BL to be sure of them before order..

      Comment

      • EazyBone
        Badcaps Legend
        • Jun 2023
        • 1306
        • United states

        #23
        Several tvs have main board send signal to PSU for backlight. How are you certain this isn't that way. But understood on legend. If you don't believe that's a possibility then it's PSU and LEDs.

        Comment

        • Cornito
          Senior Member
          • Jan 2024
          • 90
          • France

          #24
          Originally posted by EazyBone
          Several tvs have main board send signal to PSU for backlight. How are you certain this isn't that way. But understood on legend. If you don't believe that's a possibility then it's PSU and LEDs.
          I've checked that point and i have the signal.
          Please find attached the requested pictures Click image for larger version

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          Comment

          • Cornito
            Senior Member
            • Jan 2024
            • 90
            • France

            #25
            Originally posted by Diah
            you are afraid of the glued screen..LOL.... i advised you to arrange space at your place and take out the screen and keep it in safe place,, to have access to BL to be sure of them before order..
            Yep i've in mind your advice, just want to avoid having the tv open for weeks, it takes a lot of space dissassembled

            Comment

            • Cornito
              Senior Member
              • Jan 2024
              • 90
              • France

              #26
              So tried to desassemble it to confirm led strips références, and i broke the panel.
              End of the story

              Comment

              • EazyBone
                Badcaps Legend
                • Jun 2023
                • 1306
                • United states

                #27
                Sorry to hear, we are a forum to help figure stuff out. Next time can ask for help on how to remove the panels like that I would of shared my knowledge on how to.

                Do you plan on still testing to see what was potentially wrong with the lights.

                Comment

                • Cornito
                  Senior Member
                  • Jan 2024
                  • 90
                  • France

                  #28
                  You've done all possible and i thank you for that.
                  It's my mistake, i was too quick in a corner and broke the panel.

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12093
                    • U.S.

                    #29
                    Many many videos on backlight replacement on youtube, breaking a panel stings for a while BUT on the bright side, it was only a tcl.

                    Comment

                    • Cornito
                      Senior Member
                      • Jan 2024
                      • 90
                      • France

                      #30
                      Ahah it's my first panel breakage since my first repair.
                      Ot must happen at one time.
                      Bought it with backlight default, my pitty but no so much money loss.
                      I learnt so much.

                      Comment

                      • EazyBone
                        Badcaps Legend
                        • Jun 2023
                        • 1306
                        • United states

                        #31
                        Yea, I randomly do that also. But are you still gonna test the tvs lights or did you rage quit. I have done this also lol

                        Comment

                        • Cornito
                          Senior Member
                          • Jan 2024
                          • 90
                          • France

                          #32
                          Nope I'll not rage quit, I'll disassemble the whole tv to sell parts in order to reduce the price for this lessons.
                          I'll test led by led to found out the real root cause to confirm hypothesis.

                          Comment

                          • EazyBone
                            Badcaps Legend
                            • Jun 2023
                            • 1306
                            • United states

                            #33
                            Excellent. Those blue LEDs can be taken out and sold sometimes also, if they are working that is. My qn82raxxxx whole set is like $200 and had 48 strips. On eBay 4 strips alone sold for $50 so who knows. Right on

                            Comment

                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6355
                              • Germany

                              #34
                              Originally posted by Cornito
                              Nope I'll not rage quit.
                              don't forget to delete TCL from yours daily live dictionary

                              Comment

                              • Cornito
                                Senior Member
                                • Jan 2024
                                • 90
                                • France

                                #35
                                Originally posted by Diah
                                don't forget to delete TCL from yours daily live dictionary
                                Ahah why?

                                Comment

                                • Cornito
                                  Senior Member
                                  • Jan 2024
                                  • 90
                                  • France

                                  #36
                                  Originally posted by EazyBone
                                  Excellent. Those blue LEDs can be taken out and sold sometimes also, if they are working that is. My qn82raxxxx whole set is like $200 and had 48 strips. On eBay 4 strips alone sold for $50 so who knows. Right on
                                  I've completely dismantled the TV to take parts that can be sold. It's a huge mess; everything is glued, so it's quite impossible to fix a backlight issue.

                                  I measured all voltages LED by LED. The LED tester shows 6V directly on the majority of the LEDs, but on some, for a few milliseconds, I can see 9.2V, 15V, or 153V before reaching a steady 6V.
                                  It's as if the internal resistance needs to heat up a bit before becoming steady.

                                  This could be the root cause leading to PSU protection mode.

                                  So based on that I don't think I'll sell any LED strip

                                  Comment

                                  • peterkos2
                                    Member
                                    • Nov 2020
                                    • 40
                                    • Slovensko

                                    #37
                                    Originally posted by Cornito

                                    I've completely dismantled the TV to take parts that can be sold. It's a huge mess; everything is glued, so it's quite impossible to fix a backlight issue.

                                    I measured all voltages LED by LED. The LED tester shows 6V directly on the majority of the LEDs, but on some, for a few milliseconds, I can see 9.2V, 15V, or 153V before reaching a steady 6V.
                                    It's as if the internal resistance needs to heat up a bit before becoming steady.

                                    This could be the root cause leading to PSU protection mode.

                                    So based on that I don't think I'll sell any LED strip
                                    Greetings. How did you disassemble the display together with the frame? Thanks

                                    Comment

                                    • peterkos2
                                      Member
                                      • Nov 2020
                                      • 40
                                      • Slovensko

                                      #38
                                      Originally posted by Cornito
                                      Finally it seems i found the LED part number: GIC65LB100_3030F2.1D_V0.7_20200108

                                      Click image for larger version

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                                      Found these on AliExpress :
                                      https://fr.aliexpress.com/item/10050...|query_from%3A

                                      https://fr.aliexpress.com/item/10050...|query_from%3A

                                      On pictures i can now understand why i've got so many connector and same not at the same height on the same led strip.

                                      I hope this can help somebody,​
                                      But these links on Aliexpress are for 75" TV

                                      Comment

                                      • Cornito
                                        Senior Member
                                        • Jan 2024
                                        • 90
                                        • France

                                        #39
                                        Originally posted by peterkos2

                                        Greetings. How did you disassemble the display together with the frame? Thanks
                                        I had to place a plastic card between the frame and the LCD Panel.
                                        The plastic card has to be thin as possible, and just sliding the card, you should be able to unglue the LCD-Panel from the frame.

                                        Be sure that the bottom frame is removed first, LCD Panel is covered in the bottom of the screen

                                        Comment

                                        • Cornito
                                          Senior Member
                                          • Jan 2024
                                          • 90
                                          • France

                                          #40
                                          Originally posted by peterkos2

                                          But these links on Aliexpress are for 75" TV
                                          Try to search with the reference i've shared, Link may have changed

                                          Comment

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