Sharp LC-50LB370U Where to buy LED Strips?

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  • Gorrillasnot
    Badcaps Veteran
    • Dec 2013
    • 316
    • USA

    #21
    Re: Sharp LC-50LB370U Where to buy LED Strips?

    Originally posted by budm
    Leave the Black probe on the chassis, red probe on one of the two black wire of the LED connector then turn the TV on while watching the meter to see if you see the Voltage jumps up for seconds or not, the turn off the TV and do the same on the other black wire of the LED connector, report the reading.
    Measuring at the black wires I get 0v in standby and when powering on.


    thanks
    Attached Files

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Sharp LC-50LB370U Where to buy LED Strips?

      OK, so now we know for sure there is no current return on the two black wires.
      You will have to make sure next that the feeding +Voltage actual gets right to the termilal of the LED strip next.
      See this thread to see why, speciall on post #18:
      https://www.badcaps.net/forum/showthread.php?t=66893
      Last edited by budm; 01-24-2018, 12:03 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

      • Gorrillasnot
        Badcaps Veteran
        • Dec 2013
        • 316
        • USA

        #23
        Re: Sharp LC-50LB370U Where to buy LED Strips?

        With the TV plugged in and powered on testing at the + at the head end of each strip I get the following voltage (from the top strip down)
        1. 38.6v and causes the strip below it (strip 2) to dimly light all 11 LEDs.
        2. 65.4v
        3. 38.6v and causes strip 4 to dimly light up.
        4. 64.4v
        5. 0v there's a problem here somewhere, but not sure what..each bulb lights individually when checked with DMM in diode mode.
        6. 65.4v

        I think I'm getting closer..whatever is causing strip 5 to have 0v is probably the main problem?

        thanks
        Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Sharp LC-50LB370U Where to buy LED Strips?

          One thing is not so clear as how all 6 strips are wired up.
          It has FIVE wires from the the strips, THREE red wires are all connected to the V+ but only TWO returns wires, I expect FOUR wires for two set of LED strips.
          Is there any way you can tell me how all six strips are wired?
          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

          • Gorrillasnot
            Badcaps Veteran
            • Dec 2013
            • 316
            • USA

            #25
            Re: Sharp LC-50LB370U Where to buy LED Strips?

            There is 3 black and 3 red wires coming in to the front of the panel (where the LED strips are) and from the top strip down they are.
            1. black black
            2. black red
            3. black black
            4. black red
            5. black black
            6. black red

            is that what u mean or do I need to trace them to the power board?

            thanks

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Sharp LC-50LB370U Where to buy LED Strips?

              Not really, each strip has two wires but some how it ends up with just 5 wires at the LED connector.
              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

              • mmartell
                Badcaps Legend
                • Oct 2013
                • 3189
                • Canada

                #27
                Re: Sharp LC-50LB370U Where to buy LED Strips?

                On mine there are six wires off the led driver - 3 red and 3 black.

                Comment

                • mmartell
                  Badcaps Legend
                  • Oct 2013
                  • 3189
                  • Canada

                  #28
                  Re: Sharp LC-50LB370U Where to buy LED Strips?

                  Could be each red/black is driving two strips. He did say 66v on the output and there are 11 LEDs per row x 2 rows = 22 leds x 3v = 66v

                  Comment

                  • Gorrillasnot
                    Badcaps Veteran
                    • Dec 2013
                    • 316
                    • USA

                    #29
                    Re: Sharp LC-50LB370U Where to buy LED Strips?

                    Originally posted by budm
                    Not really, each strip has two wires but some how it ends up with just 5 wires at the LED connector.
                    There are 6 wires at the LED connector coming from the PSU.
                    It looked like 5 in my other pics..sorry about that.

                    thanks
                    Attached Files
                    Last edited by Gorrillasnot; 01-25-2018, 10:00 AM.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Sharp LC-50LB370U Where to buy LED Strips?

                      Originally posted by Gorrillasnot
                      There are 6 wires at the LED connector coming from the PSU.
                      It looked like 5 in my other pics..sorry about that.

                      thanks
                      OK, that is more like it.
                      So it looks like one LED drive has two set of LED STRINGS connected in parallel, then another driver has only one set of LED string.
                      Last edited by budm; 01-25-2018, 10:29 AM.
                      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

                      • Gorrillasnot
                        Badcaps Veteran
                        • Dec 2013
                        • 316
                        • USA

                        #31
                        Re: Sharp LC-50LB370U Where to buy LED Strips?

                        I cant seem to figure out why strip #5 has no voltage..I don't see any damage to the wires.
                        Can a new wire be routed to it or jumped from the positive side of another strip or would that be a bad idea?

                        thanks

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: Sharp LC-50LB370U Where to buy LED Strips?

                          All three red wires are tied together at the LED connector at the power supply board.
                          If you measure the Voltage right at the #5 LED strip terminal of the SMD connector pin that is soldered to the LED strip where the red wire is, do you get the Voltage there?
                          Or if you check the resistance of the pin above all the way back the power supply board soldered pin, does it show 0 Ohms or so.
                          The strip is also linked by the SMD connector that can be bad, otherwise you can also swab the #5 LED string with other to see if the problem will follow.
                          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

                          • Gorrillasnot
                            Badcaps Veteran
                            • Dec 2013
                            • 316
                            • USA

                            #33
                            Re: Sharp LC-50LB370U Where to buy LED Strips?

                            I dont get any voltage at the connector..both wires going to #5 are black if that matters?

                            The resistance from positive pin on LED strip #5 to where the 2 black wires are connected on PSU +VLED1 my DMM shows 1. Ground on #5 to +VLED1 is 0 (might of been the other way around).

                            I tried swapping a right from strip #3 to the right for strip #5. Plugged it in and turned it on and 2 strips lit up (in the middel) for about 10 seconds and then they all went back out. Retested all the LEDs 1 by 1 again and 1 of the LEDs in strip #4 was out.
                            I replaced the bad LED and swapped the strips back..still no back lights.

                            this thing is kickin my butt..lol
                            Last edited by Gorrillasnot; 01-25-2018, 08:31 PM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: Sharp LC-50LB370U Where to buy LED Strips?

                              "Retested all the LEDs 1 by 1 again and 1 of the LEDs in strip #4 was out." I m confused, I thought all the bad LEDs or the bad LED strips are replaced but now 1 of them on #4 strip just gone out?
                              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

                              • Gorrillasnot
                                Badcaps Veteran
                                • Dec 2013
                                • 316
                                • USA

                                #35
                                Re: Sharp LC-50LB370U Where to buy LED Strips?

                                Yep all the LEDs were working, when I mean working I mean they would light individually when tested with DMM in diode mode (not working when TV plugged in and turned on).
                                When I swapped strip 3 to strip 5 it lit 2 of the middle strips for a few seconds then they went out so I unplugged the tv and retested each LED in diode mode and found 1 bad 1 in strip 4 (right side)..I'm guessing something is shorted and when I swapped strips it blew the LED in strip 4.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: Sharp LC-50LB370U Where to buy LED Strips?

                                  OK, if you look at the attached picture, you can see that trip #5 is connected in series with strip #6 to form one LED string.
                                  Please look at how strip 1~ 4 are connected.
                                  Is strip #1 connected in series with #2?
                                  Is strip # 3 connected in series with #4?
                                  If you can take pictures, that will help.
                                  Once I know how they are connected then I can tell you how to test each string one at a time.
                                  Attached Files
                                  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

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #37
                                    Re: Sharp LC-50LB370U Where to buy LED Strips?

                                    Originally posted by Gorrillasnot
                                    Yep all the LEDs were working, when I mean working I mean they would light individually when tested with DMM in diode mode (not working when TV plugged in and turned on).
                                    When I swapped strip 3 to strip 5 it lit 2 of the middle strips for a few seconds then they went out so I unplugged the tv and retested each LED in diode mode and found 1 bad 1 in strip 4 (right side)..I'm guessing something is shorted and when I swapped strips it blew the LED in strip 4.
                                    It is hard to blow just one LED on the strip since they are connected in series with the other LEDs as well, and all those white silkscreen on the strip makes it hard to do accidental shorts circuit.
                                    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

                                    • mmartell
                                      Badcaps Legend
                                      • Oct 2013
                                      • 3189
                                      • Canada

                                      #38
                                      Re: Sharp LC-50LB370U Where to buy LED Strips?

                                      Gorillasnot sent you a pm...

                                      Comment

                                      • Gorrillasnot
                                        Badcaps Veteran
                                        • Dec 2013
                                        • 316
                                        • USA

                                        #39
                                        Re: Sharp LC-50LB370U Where to buy LED Strips?

                                        budm: Here is some pics of how the wires connect to the strips.
                                        Looking forward to learning how to test the strings.

                                        thanks
                                        Attached Files

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #40
                                          Re: Sharp LC-50LB370U Where to buy LED Strips?

                                          The #5 and #6 are easy to see how they are wired up together, but the other 4 strips are hard to tell due to the taps are holding the bundle of wires together, not like the #5 and #5.
                                          You will have to remove the tapes and un-bundle the wires.
                                          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

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