Sharp aquos LC-40LE810E

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  • Jstone86
    Member
    • Jul 2018
    • 20
    • Ghana

    #141
    Re: Sharp aquos LC-40LE810E

    Originally posted by budm
    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?
    After I removed the ribbon cable between lcd and tcon board I got same voltage 0.67v.i couldn't do the dummy test cuz I was waiting for the KIA378R12PI ic I ordered from online. Even then am confused on how to do the dummy test cuz I am a novice so if you can please upload any pics /vdeo or link to any post here with instructions on how to do the dummy test. Thanks

    Comment

    • marksik
      Member
      • Jun 2019
      • 27
      • Spain

      #142
      Re: Sharp aquos LC-40LE810E

      HI guys.

      I have the same problem as topic starter.

      I already replaced resistor r7019 to new one (33k), also used 560 ohm resistor for this trick with 9-11 cables. I think that after this trick with cables (but before 7019 resistor replacement) I saw that screen turned on for couple of seconds.

      But it was only once. After resistor replacement TV still doesn't work. When I turn it on, for 7 seconds its front V-light turns on without flashing. Also I see that red LED on motherboard turns on after 5 seconds. And then red LED turns off and V-light starts blinking (2 short blinks then nothing, then again 2 short blinks and again).

      Then, if I press Power button on its remote for 2 second, V-light turns off then turns on without flashing, and LED on motherboard turns on and we have the same story as I described above.

      Help me please.

      P.S. I didn't replace optos, just bought them at AliExpress.

      Comment

      • marksik
        Member
        • Jun 2019
        • 27
        • Spain

        #143
        Re: Sharp aquos LC-40LE810E

        Update. I tried Vol - CH + Power trick. Screen backlight turned on but no image. Just brigth screen. Red LED on motherboard blinking with 5 sec period. When I turn the TV off with remote, it turns off, then U can turn it on again (without image).

        But if I use its hardware button and turn it off, it doesnt turns on again, I have to use Vol - CH + Power trick again.

        Comment

        • marksik
          Member
          • Jun 2019
          • 27
          • Spain

          #144
          Re: Sharp aquos LC-40LE810E

          Originally posted by marksik
          Update. I tried Vol - CH + Power trick. Screen backlight turned on but no image. Just brigth screen. Red LED on motherboard blinking with 5 sec period. When I turn the TV off with remote, it turns off, then U can turn it on again (without image).

          But if I use its hardware button and turn it off, it doesnt turns on again, I have to use Vol - CH + Power trick again.
          And the same happens if I put back cable #9 without resistor. I can turn on the backlight but with no image.
          Last edited by marksik; 07-16-2019, 09:52 AM.

          Comment

          • Aussie_Matt
            New Member
            • Aug 2019
            • 7
            • Australia

            #145
            Re: Sharp aquos LC-40LE810E

            Hi guys, I have a Sharp LC

            Comment

            • Aussie_Matt
              New Member
              • Aug 2019
              • 7
              • Australia

              #146
              Re: Sharp aquos LC-40LE810E

              Hi guys I have a sharp LC-40LE820X, and the main power board is a DPS-126CP B.

              I can display pictures from a usb for hours on end.

              When on TV function, after a period of time (20 minutes or so) the picture becomes choppy, then appears to turn off: When I try to turn it on it then has a warning similar to "service has been changed, execute auto install".

              I suspect a power supply issue: Does this sound right?

              Comment

              • Aussie_Matt
                New Member
                • Aug 2019
                • 7
                • Australia

                #147
                Re: Sharp aquos LC-40LE810E

                I've just brushed the dust off: It appears C7813 s cracked.

                Comment

                • Davi.p
                  Badcaps Legend
                  • Sep 2009
                  • 4266
                  • Italy - Milan

                  #148
                  Re: Sharp aquos LC-40LE810E

                  Aussie: don't make confusion, you have a different issue, open up your own discussion.
                  Marksik: to make long story short, no need to change any resistors, put back the original ones, and change the optocoupler, if the AC_DET works again try the tv, if it work no more inspect/change the KIA voltage regulator..

                  Comment

                  • marksik
                    Member
                    • Jun 2019
                    • 27
                    • Spain

                    #149
                    Re: Sharp aquos LC-40LE810E

                    Originally posted by Davi.p
                    Aussie: don't make confusion, you have a different issue, open up your own discussion.
                    Marksik: to make long story short, no need to change any resistors, put back the original ones, and change the optocoupler, if the AC_DET works again try the tv, if it work no more inspect/change the KIA voltage regulator..

                    Davi.p, thanks for your answer. I changed all optos (4 pics) and nothing changed. Situation remaining as described above. Can you please point on KIA voltage regulator - where I can find it on the board. Did you mean 4-legs element (kia378r12) which is situated under the metal shield?

                    Thank you
                    Last edited by marksik; 08-07-2019, 07:29 AM.

                    Comment

                    • marksik
                      Member
                      • Jun 2019
                      • 27
                      • Spain

                      #150
                      Re: Sharp aquos LC-40LE810E

                      I ordered KIA378R12PI from eBay. It will come in 2-3 weeks and I will inform about results.

                      Damn, I have been waiting for optos about 1 month and now I have to wait another month

                      Comment

                      • marksik
                        Member
                        • Jun 2019
                        • 27
                        • Spain

                        #151
                        Re: Sharp aquos LC-40LE810E

                        Just measured voltage at pin 12 of that 12-pin connector and got 3,5V. Also measured pin 1 of PNL-12V connector and got 12 volts.

                        But it all drops in 5-6 seconds, so may be KIA is the real problem...
                        Last edited by marksik; 08-07-2019, 12:52 PM.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #152
                          Re: Sharp aquos LC-40LE810E

                          Originally posted by marksik
                          Just measured voltage at pin 12 of that 12-pin connector and got 3,5V. Also measured pin 1 of PNL-12V connector and got 12 volts.

                          But it all drops in 5-6 seconds, so may be KIA is the real problem...
                          When the 12V at the PNL-12V disappear, is the PNL-POW (control signal to turn on the KIA switched 12V regulator IC) still around 2.5 ~ 3VDC? If the PNL-POW is <1V then there will be no 12V at PNL-12V.
                          The typical failure of the KIA regulator is that the output will be only around 7 ~ 8V when it is bad.
                          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

                          • marksik
                            Member
                            • Jun 2019
                            • 27
                            • Spain

                            #153
                            Re: Sharp aquos LC-40LE810E

                            Originally posted by budm
                            When the 12V at the PNL-12V disappear, is the PNL-POW (control signal to turn on the KIA switched 12V regulator IC) still around 2.5 ~ 3VDC? If the PNL-POW is <1V then there will be no 12V at PNL-12V.
                            The typical failure of the KIA regulator is that the output will be only around 7 ~ 8V when it is bad.
                            When 12v disappear (it drops to 0), PNL-POW voltage drops from 3,5v to 0,13v...

                            To be more specific, I still operate with this resistors trick and I have changed all 4 optos to new ones from AliExpress.

                            Now when I turn on the TV it has its V-light solid on the front panel. Also I see red LED on the motherboard (it turns on in 3-4 seconds after TV turned on). Then, in 5-7 second red LED on the motherboard turns of and V-light on the frontal panel starts blinking (2 times then again 2 times loop). Also when red LED disappear I start to hear noise from motherboard - hi-frequency noise.
                            Last edited by marksik; 08-07-2019, 02:06 PM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #154
                              Re: Sharp aquos LC-40LE810E

                              PNL-POW command is from main board, so when it drops below 1V then you'll not have 12V to run the T-CON.
                              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

                              • marksik
                                Member
                                • Jun 2019
                                • 27
                                • Spain

                                #155
                                Re: Sharp aquos LC-40LE810E

                                Originally posted by budm
                                PNL-POW command is from main board, so when it drops below 1V then you'll not have 12V to run the T-CON.
                                Could you suggest the possible fail cause?

                                For me it looks like TV starts normally, then in 5-7 second something goes wrong and TV starts blinking with its V-light.
                                Last edited by marksik; 08-07-2019, 03:07 PM.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #156
                                  Re: Sharp aquos LC-40LE810E

                                  What error code are you getting?
                                  You need to report the Voltage readings on the connector of the power supply that goes to the main board.
                                  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

                                  • marksik
                                    Member
                                    • Jun 2019
                                    • 27
                                    • Spain

                                    #157
                                    Re: Sharp aquos LC-40LE810E

                                    I have 2 short blinks - pause - 2 short blinks pause loop.

                                    PIN 1 - 13,05V UR13.2V (SIGNAL)
                                    PIN 2 - 13,05V UR13.2V (SIGNAL)
                                    PIN 3 - 13,05V S13.2V (AUDIO)
                                    PIN 4 - 13,08V S13.2V (AUDIO)
                                    PIN 5 - 0V SGND (AUDIO)
                                    PIN 6 - 0V SGND (AUDIO)
                                    PIN 7 - 0V SGND (SIGNAL)
                                    PIN 8 - 0V SGND (SIGNAL)
                                    PIN 9 - 4,08V AC-DET: - note - there is no cable from AC-DET side because I put it at pin 11 with resistor
                                    PIN 10 - 3,05V PS-ON
                                    PIN 11 - 5V BU5V
                                    PIN 12 - 3,27V PNL-POW

                                    Comment

                                    • marksik
                                      Member
                                      • Jun 2019
                                      • 27
                                      • Spain

                                      #158
                                      Re: Sharp aquos LC-40LE810E

                                      I just realised that sometimes when the TV is on and I press Menu button at remote, V-light starts to blink 5 times (5 short blinks) but after 1 cycle of 5 short blinks V-light returns to its common behavior - 2 short blinks.

                                      Comment

                                      • marksik
                                        Member
                                        • Jun 2019
                                        • 27
                                        • Spain

                                        #159
                                        Re: Sharp aquos LC-40LE810E

                                        Originally posted by budm
                                        What error code are you getting?
                                        You need to report the Voltage readings on the connector of the power supply that goes to the main board.
                                        Yep, I checked all twice. All above is correct

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #160
                                          Re: Sharp aquos LC-40LE810E

                                          Originally posted by marksik
                                          Yep, I checked all twice. All above is correct
                                          Your post #153:
                                          When 12v disappear (it drops to 0), PNL-POW voltage drops from 3,5v to 0,13v...
                                          Your post #157:
                                          PIN 12 - 3,27V PNL-POW conflict with your result in post # 153.
                                          So is it staying at 3.27V or it drops down to 0.13V?
                                          Last edited by budm; 08-08-2019, 02:06 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

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