Sharp aquos LC-40LE810E

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  • Jstone86
    Member
    • Jul 2018
    • 20
    • Ghana

    #121
    Re: Sharp aquos LC-40LE810E

    Originally posted by budm
    Since you do have 3.25V PNL-POW control signal, so do you get 12V at the PNL-12V connector pin?
    Finally I was able to located PNL-12V. I got 2 volts when I Power on the TV and it immediately drop to 0
    Attached Files

    Comment

    • Davi.p
      Hobbist
      • Sep 2009
      • 4261
      • Italy - Milan

      #122
      Re: Sharp aquos LC-40LE810E

      Hi, i have the same TV with same problems as Jstone, apart the fact that i have not put any new resistor, i have changed the PC7703 opto with a good one and now i have good AC-DET signal, then i've changed the rest of the 3 opto with no changement, i have from seconds by the power-on and for some seconds a tension of appr. 7V on PNL-12V then it decreases to 0 slowly. Now i will study the PANEL SUPPLY that is probably a separate supply stage.
      Last edited by Davi.p; 07-12-2018, 04:08 PM.

      Comment

      • Davi.p
        Hobbist
        • Sep 2009
        • 4261
        • Italy - Milan

        #123
        Re: Sharp aquos LC-40LE810E

        The 13,2V output supply rail is regulated by the fixed linear regulator KIA378R12PI (Q7909) that outputs 12v normally, with an enable pin, as the d.sheet says the eanble pin (Vc) activates output when is >=2v, mine is 3v from the PNL_POW signal so i think the KIA doesn't work well.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #124
          Re: Sharp aquos LC-40LE810E

          'KIA378R12PI' That is the common failure Switched 12V LDO regulator IC.
          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

          • Davi.p
            Hobbist
            • Sep 2009
            • 4261
            • Italy - Milan

            #125
            Re: Sharp aquos LC-40LE810E

            HI Budm, sorry, you are meaning the KIA is a common problem for theese tvs? I have ordered the part from Aliexpress. We will see between 1/2 months maybe.
            Last edited by Davi.p; 07-13-2018, 03:39 AM.

            Comment

            • Davi.p
              Hobbist
              • Sep 2009
              • 4261
              • Italy - Milan

              #126
              Re: Sharp aquos LC-40LE810E

              Damn! Some sad doubts comes... I have supplied externally 12v to the tcon leaving the PSU tcon supply connector disconnected, before i switch on the tv i switch on the ext. PSU, the voltage falls to the same 7V, when i switch on the tv suddenly tcon voltage become 12v but after some secs tv goes in protection with the same 2 flashes and tcon voltage falls to the 7V. I have done researches on tcon, none of the power semicon tests in short with tester current in, also tested one internal mosfet of a pmic. I'm sad...
              Last edited by Davi.p; 07-13-2018, 04:20 AM.

              Comment

              • Jstone86
                Member
                • Jul 2018
                • 20
                • Ghana

                #127
                Re: Sharp aquos LC-40LE810E

                I noticed something today, if 8 removed the tcon connector pin power from psu board I get 12volts on PNL pin 1 & 2 2 which immediately drops to 0.but when I connected the tcon I get 2 volts on pnl pin 1 & 2 and drop as usual. By the way the I think there might be some problems with the tcon cuz I see some black mark on the tcon Pl female comector. Here is ten attach pics
                Attached Files

                Comment

                • Davi.p
                  Hobbist
                  • Sep 2009
                  • 4261
                  • Italy - Milan

                  #128
                  Re: Sharp aquos LC-40LE810E

                  Too much pictures from me, e-ehm... that seems only a pencil mark..

                  Comment

                  • Jstone86
                    Member
                    • Jul 2018
                    • 20
                    • Ghana

                    #129
                    Re: Sharp aquos LC-40LE810E

                    Originally posted by Davi.p
                    Too much pictures from me, e-ehm... that seems only a pencil mark..
                    Hehehe just wants to make sure that I ruled everything out

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #130
                      Re: Sharp aquos LC-40LE810E

                      Originally posted by Davi.p
                      HI Budm, sorry, you are meaning the KIA is a common problem for theese tvs? I have ordered the part from Aliexpress. We will see between 1/2 months maybe.
                      Example:
                      https://www.badcaps.net/forum/showth...ht=KIA378R12PI
                      https://www.badcaps.net/forum/showth...ht=KIA378R12PI
                      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

                      • Jstone86
                        Member
                        • Jul 2018
                        • 20
                        • Ghana

                        #131
                        Re: Sharp aquos LC-40LE810E

                        So budm just to clarify for my TV, I need to CHANGE the KIA378R12PI??

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #132
                          Re: Sharp aquos LC-40LE810E

                          Disconnect the PL connector on the T-CON board then put the on the PNL12V pin on the power supply board then turn on the TV to see if the output will jump up to 12V or not, if not then more likely to be bad KIA.
                          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

                          • Jstone86
                            Member
                            • Jul 2018
                            • 20
                            • Ghana

                            #133
                            Re: Sharp aquos LC-40LE810E

                            Originally posted by budm
                            Disconnect the PL connector on the T-CON board then put the on the PNL12V pin on the power supply board then turn on the TV to see if the output will jump up to 12V or not, if not then more likely to be bad KIA.
                            I indeed get 12v when I disconnected the Pl connector. But only 2v flows in when I connected back the Pl. So that means my KIA378R12PI is OK right? What do u suspect the problem is

                            Comment

                            • Davi.p
                              Hobbist
                              • Sep 2009
                              • 4261
                              • Italy - Milan

                              #134
                              Re: Sharp aquos LC-40LE810E

                              You have to put a resistor or a 12v Lamp as load to the PL output so you can judge better if KIA is good or not. If it stays on then the tcon has problems.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #135
                                Re: Sharp aquos LC-40LE810E

                                OK, next test will be with dummy load, you can simulate 1A load by using 12 Ohms 10W resistor to see if it can handle 1A load or not.
                                If you are going to use the lamp, you need to check its cold resistance first since cold resistance will be about 15 times lower than the hot resistance.
                                Last edited by budm; 07-14-2018, 01:25 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

                                • Davi.p
                                  Hobbist
                                  • Sep 2009
                                  • 4261
                                  • Italy - Milan

                                  #136
                                  Re: Sharp aquos LC-40LE810E

                                  Hi Budm, warning: my test with external supply to tcon was faulty due to a defective crocodile test cable used, swapped it with a good one the tv is perfectly working so the problem is merely the only KIA chip that is faulty, BYE BYE to ALL.

                                  Comment

                                  • Jstone86
                                    Member
                                    • Jul 2018
                                    • 20
                                    • Ghana

                                    #137
                                    Re: Sharp aquos LC-40LE810E

                                    Originally posted by budm
                                    OK, next test will be with dummy load, you can simulate 1A load by using 12 Ohms 10W resistor to see if it can handle 1A load or not.
                                    If you are going to use the lamp, you need to check its cold resistance first since cold resistance will be about 15 times lower than the hot resistance.
                                    I think i can get 12R 10W resistor from the local electronic shop here but i have also ordered KIA378R12PI from aliexpress which delivery is approximately 2 weeks.by the way can you please show me how i can stimulate or test with the 12R 10W resistor.pictures wud be better .thanks

                                    Comment

                                    • Davi.p
                                      Hobbist
                                      • Sep 2009
                                      • 4261
                                      • Italy - Milan

                                      #138
                                      Re: Sharp aquos LC-40LE810E

                                      I think this test is facoltative, i guess surely your KIA is bad, wait the piece and try it.. bye.

                                      Comment

                                      • Jstone86
                                        Member
                                        • Jul 2018
                                        • 20
                                        • Ghana

                                        #139
                                        Re: Sharp aquos LC-40LE810E

                                        After theKIA378R12PI (Q7909) arrived, I changed it and as usual TV dosent turn on. Previously I got 2v PL pin 1 and 2 when I turn on the TV but now get 0.67v so memu touch key buttons don't respond only TV remote also the led light blink 2-2 without stopping hmm. If I disconnected the Pl connector I get 12volts on PNL pin 1ansd 2

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #140
                                          Re: Sharp aquos LC-40LE810E

                                          Next is to keep the DCV meter on the PL connector, remove the ribbon cables between the LCD panel and T-CON to see if the PL connector will jump up to 12VDC or not when TV is turned on.
                                          BTW, did you do the test with the dummy load?
                                          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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