Sharp led lc-40le653u no power

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  • crdz66
    Badcaps Veteran
    • Nov 2012
    • 242
    • USA

    #1

    Sharp led lc-40le653u no power

    Hello everyone.

    I need you value opinion.
    I have a tv from a friend that fall to ground and now doesn't turn on.

    So far i check the connections on ps and i get 19v on connector cn02 on pin 1,2. (this connector doesn't show standby pic)

    on main board i have 5v present on connector coming from power button. But, as soon i pushed, voltage is not present on pin going to ps on/off.

    So main board is bad???

    Thanks
    Attached Files
  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #2
    Re: Sharp led lc-40le653u no power

    Have you tried with a remote? Should be a voltage change when you push button at connector that plugs into mainboard from buttons
    I assume no responsibility for any stupid suggestions I might post.

    Comment

    • crdz66
      Badcaps Veteran
      • Nov 2012
      • 242
      • USA

      #3
      Re: Sharp led lc-40le653u no power

      Yes like you see on pic 4. Voltage drop from 5v to 1.17volts once push the power button.

      Comment

      • dskall
        Badcaps Legend
        • Oct 2016
        • 2905
        • usa

        #4
        Re: Sharp led lc-40le653u no power

        Need to check voltages on mainboard. Was there any damage to tv?
        I assume no responsibility for any stupid suggestions I might post.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Sharp led lc-40le653u no power

          No hair line cracks on the power supply board for sure?
          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

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #6
            Re: Sharp led lc-40le653u no power

            Have you checked all the 0 ohm resistors on the mainboard top and bottom are not open circuit.
            Willing to help but I'm no expert.

            Comment

            • crdz66
              Badcaps Veteran
              • Nov 2012
              • 242
              • USA

              #7
              Re: Sharp led lc-40le653u no power

              I will check. Thanks

              Comment

              • crdz66
                Badcaps Veteran
                • Nov 2012
                • 242
                • USA

                #8
                Re: Sharp led lc-40le653u no power

                dump question.
                ps_on (3.3v) on sharp led tv is generate on power supply? or coming from main board

                Comment

                • dskall
                  Badcaps Legend
                  • Oct 2016
                  • 2905
                  • usa

                  #9
                  Re: Sharp led lc-40le653u no power

                  Unplug connector what voltage do you get at ps_on?
                  I assume no responsibility for any stupid suggestions I might post.

                  Comment

                  • crdz66
                    Badcaps Veteran
                    • Nov 2012
                    • 242
                    • USA

                    #10
                    Re: Sharp led lc-40le653u no power

                    0 volts

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Sharp led lc-40le653u no power

                      The PS-ON comes from 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

                      • Dgtech
                        E. Technician
                        • Apr 2009
                        • 1462
                        • Steeler

                        #12
                        Re: Sharp led lc-40le653u no power

                        Just throwing this out there. I'm thinking, since this was a fall, like bud said, Hairline crack or broken solder joint somewhere. Transformer maybe? Connectors?
                        The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                        Comment

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