sharp LC-40E67UN death set no stand-by

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  • hmendez86
    Badcaps Veteran
    • Jun 2015
    • 344
    • united states

    #1

    sharp LC-40E67UN death set no stand-by

    No power at all. No 5v on the power supply,,,fuse are good and rectifier good.....transistor are good too....
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: sharp LC-40E67UN death set no stand-by

    Pictures, pictures, pictures.
    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

    • hmendez86
      Badcaps Veteran
      • Jun 2015
      • 344
      • united states

      #3
      Re: sharp LC-40E67UN death set no stand-by









      Attached Files

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: sharp LC-40E67UN death set no stand-by

        Sharp RDENCA354WJQZ (DPS-208BPA) Power Supply Unit.
        http://www.shopjimmy.com/sharp-rdenc...wer-supply.htm

        OK, SJ does not have the pictures of the bottom side of the board, please take good straight shot pictures of the bottom side of the board so I can give you the test point to test.
        History of the TV?
        I can see some fusible resistors (Low Ohm white ceramic body resistor) on the board.
        Last edited by budm; 08-17-2016, 02:11 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

        • R_J
          Badcaps Legend
          • Jun 2012
          • 9514
          • Canada

          #5
          Re: sharp LC-40E67UN death set no stand-by

          Its hard to tell from the picture but I think the area I outlined may be the standby circuit, What is the number on the ic I outlined in yellow? it may be one of those TNYxxx ic's, they like to go bad.
          Attached Files

          Comment

          • hmendez86
            Badcaps Veteran
            • Jun 2015
            • 344
            • united states

            #6
            Re: sharp LC-40E67UN death set no stand-by













            Attached Files

            Comment

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales

              #7
              Re: sharp LC-40E67UN death set no stand-by

              This looks very similar
              http://jestineyong.com/samsung-lcd-tv-repair/
              Willing to help but I'm no expert.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: sharp LC-40E67UN death set no stand-by

                Hate to say this, but that jestineyoung info is wrong about that 2.2 Ohm resistor, it is not for the Source pin of the STBY SMPS IC7905, if you look at the IC spec and the application circuit, you do want to put the resistor on that Source pin.
                If he traced out the board, he would have seen that R7918 (2.2 Ohms) is connected to D7918 which is the rectifier for the AUX winding of the SMPS transformer to produce the DC filtered by cap C7915. So check that to see if it is open or not.
                There is a fusible resistor R7914 that feed the main B+ for running the STBY IC7905.
                BTW, I wish the bottom side picture is a straight shot and no glare but was enough to see how the STBY SMPS IC is connected.
                It looks like someone did some works on the board, some of the solder joints do not look good.
                Last edited by budm; 08-18-2016, 09:35 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

                • CapLeaker
                  Leaking Member
                  • Dec 2014
                  • 7978
                  • Canada

                  #9
                  Re: sharp LC-40E67UN death set no stand-by

                  Did you check if the output on the secondary of the STBY voltage pin is shorted?

                  If there is no shorts there, than the problem has to be on the primary side. Usually either the resistor that budm is talking about is bad or the rectifier diode with it's filter cap. The STBY IC can fail too...
                  Yep, looks like someone was already working on that board.

                  Comment

                  • hmendez86
                    Badcaps Veteran
                    • Jun 2015
                    • 344
                    • united states

                    #10
                    Re: sharp LC-40E67UN death set no stand-by

                    I had luck i just replace the 5v stanby IC7905 and it work fine.....thanks for help well keep for records..

                    Comment

                    • CapLeaker
                      Leaking Member
                      • Dec 2014
                      • 7978
                      • Canada

                      #11
                      Re: sharp LC-40E67UN death set no stand-by

                      Very good! Sometimes the PWM (IC7905) fails, not usually, but it does. Thanks for the update!

                      Comment

                      • neilc6
                        Badcaps Legend
                        • Nov 2015
                        • 1550
                        • Canada

                        #12
                        Re: sharp LC-40E67UN death set no stand-by

                        I have the same TV and replaced a blown TNY264PN but still have no standby voltage. R7918 measures 2.4 ohms and I can't find R7914. Will keep looking. All diodes and the single transitor test ok in that area of the board. Main filter cap measures 165VDC which is low.
                        Attached Files
                        Last edited by neilc6; 07-05-2017, 03:36 PM.

                        Comment

                        • dskall
                          Badcaps Legend
                          • Oct 2016
                          • 2905
                          • usa

                          #13
                          Re: sharp LC-40E67UN death set no stand-by

                          165v is not low for standby
                          I assume no responsibility for any stupid suggestions I might post.

                          Comment

                          • neilc6
                            Badcaps Legend
                            • Nov 2015
                            • 1550
                            • Canada

                            #14
                            Re: sharp LC-40E67UN death set no stand-by

                            Ok found R7914. It is under the bottom shield and measures open. 2.2 ohm 1/2W? Marked W1/2J 95K.

                            Found this thread for finding a replacement https://www.badcaps.net/forum/showthread.php?t=36749

                            This thread applies as well https://www.badcaps.net/forum/showthread.php?t=24435

                            Shopjimmy repair kit (RDENCA336WJQZ) replaces IC7905 , D7908, R7914, and 7918
                            Last edited by neilc6; 07-05-2017, 04:57 PM.

                            Comment

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