Sharp LC-40LE810UN question

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  • tibimakai
    Badcaps Legend
    • Jan 2012
    • 3680
    • USA

    #61
    Re: Sharp LC-40LE810UN question

    That small capacitor value is 22uf/100V and I'm measuring E=0.63/25.7uf.
    On the connector of the meter it shows E=0.31.
    I don't have this capacitor with 100V value, only 50V.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #62
      Re: Sharp LC-40LE810UN question

      Are you talking about the C7912 thay laying side way by the Standby transformer?
      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

      • tibimakai
        Badcaps Legend
        • Jan 2012
        • 3680
        • USA

        #63
        Re: Sharp LC-40LE810UN question

        Yes the C7912.
        D7913 it's OK.
        All the FU resistors(are they fusible resistors?) show a value.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #64
          Re: Sharp LC-40LE810UN question

          I do not expect the DC voltage on that cap to be any higher than 25VDC at the most, but it looks like it tested OK. The spec of the IC indicates that the VCC should rise up to 18V and then the IC will send the drive signal to drive the Gate of the MOSFET which then the DC will be generated by D7913. You should hook up the meter across that cap when the TV is unplugged, then plug in the TV and see if the voltage will rise up to 18V or not. by the way. what is the resistance reading between the VCC pin of the IC and Ground?
          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

          • tibimakai
            Badcaps Legend
            • Jan 2012
            • 3680
            • USA

            #65
            Re: Sharp LC-40LE810UN question

            I have lifted D7910 and I kind of messed it up, crushed the plastic. It still shows a value. I'm scared to lift it again to double check it.
            It checked out OK when it was lifted.
            Attached Files

            Comment

            • tibimakai
              Badcaps Legend
              • Jan 2012
              • 3680
              • USA

              #66
              Re: Sharp LC-40LE810UN question

              There is no increase in voltage. Oscillates slightly, but it's around 5.9-6.1V

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #67
                Re: Sharp LC-40LE810UN question

                That diode is now dead if it's sustained that damage... it will likely be something similar to 1N4148W.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • tibimakai
                  Badcaps Legend
                  • Jan 2012
                  • 3680
                  • USA

                  #68
                  Re: Sharp LC-40LE810UN question

                  Yes you are right, it's BAS16 or BAW62 which is 1N4148.
                  This one you think it's fine?
                  http://www.digikey.com/product-detai...TTR-ND/1954014

                  Comment

                  • tibimakai
                    Badcaps Legend
                    • Jan 2012
                    • 3680
                    • USA

                    #69
                    Re: Sharp LC-40LE810UN question

                    The diode still shows OK.
                    The resistance between Vcc and Gnd is 122Kohm.
                    Last edited by tibimakai; 09-05-2012, 05:34 PM.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #70
                      Re: Sharp LC-40LE810UN question

                      That voltage supplied to D7910 and the transistor is used for other circuit. The positive leg of the start-up cap should be connected directly to the VCC pin of the SMPS IC.
                      I am tempted to use a 18V source to feed the VCC pin to kick start the SMPS IC and see if it will stay running after removing the kickstart. Do it with the protection lamp you made.
                      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

                      • tibimakai
                        Badcaps Legend
                        • Jan 2012
                        • 3680
                        • USA

                        #71
                        Re: Sharp LC-40LE810UN question

                        So basically just a touch with the 18V?
                        I don't understand what do you mean by:
                        "The positive leg of the start-up cap should be connected directly to the VCC pin of the SMPS IC."

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #72
                          Re: Sharp LC-40LE810UN question

                          "The positive leg of the start-up cap should be connected directly to the VCC pin of the SMPS IC" I just want to verify if my drawing is correct that C7912 is hooked up as I traced it.
                          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

                          • tibimakai
                            Badcaps Legend
                            • Jan 2012
                            • 3680
                            • USA

                            #73
                            Re: Sharp LC-40LE810UN question

                            The pin#7 goes to R7929. It's on the right side of the IC.
                            Attached Files
                            Last edited by tibimakai; 09-05-2012, 11:04 PM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #74
                              Re: Sharp LC-40LE810UN question

                              I see the trace goes under the IC body and then split? to the left and also to the right toward the start-up cap. Please look real close again.
                              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

                              • tibimakai
                                Badcaps Legend
                                • Jan 2012
                                • 3680
                                • USA

                                #75
                                Re: Sharp LC-40LE810UN question

                                It's not going directly to the cap, it's going through that transistor on the right side.
                                I have applied the 18V to pin#7, but nothing happened. The 109.5 at pin#5 (now it's lower 106V) became 126V.
                                Attached Files

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #76
                                  Re: Sharp LC-40LE810UN question

                                  Any output on the secondary when 18V applied?
                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #77
                                    Re: Sharp LC-40LE810UN question

                                    Well that connection does not make sense, if you look at the application notes I would think the connection will be real close to what you have. And since applying 18V directly still does not start up the circuits I am beginning to suspect the IC, but not 100% sure at this point.
                                    Bed time for me now, night.
                                    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

                                    • tibimakai
                                      Badcaps Legend
                                      • Jan 2012
                                      • 3680
                                      • USA

                                      #78
                                      Re: Sharp LC-40LE810UN question

                                      What exactly should I look for when I apply the 18V?
                                      I was measuring the main caps and they remained at 162V.
                                      Where I have marked with red that line shows 0.2Ohm.
                                      On page #8 they mention some voltage has to be under 6.23V and I'm measuring 5.99-6.1V. Not sure what they mean by that though.
                                      I'm suspecting the IC too and I can't seem to find it online, except from th Chinese dealers.

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #79
                                        Re: Sharp LC-40LE810UN question

                                        Output voltages. I think it's switching but it sees a short on the outputs. Check ALL of secondary for shorts. Do you have a scope yet?
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #80
                                          Re: Sharp LC-40LE810UN question

                                          Any voltage on those two 2200uf 16V caps on the secondary side.
                                          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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