Sharp LC48LE551U

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  • simcole
    Member
    • Apr 2014
    • 30
    • United States
    #1

    Sharp LC48LE551U

    Hello everyone. Long time reader, but I think this is my first repair question. I've fixed about 12-14 TV's so far thanks to these forums as a hobby. So I have a weird main power board for a Sharp that I need some advice on.

    The TV does not show any standby voltage when it's plugged in. This board has some weird names for the power connector that I don't know what it means (blu_on).

    Anyway plugged in and off here are my voltages on the power board:
    Pin 10 - Dim2 - 0v
    Pin 9 - Dim1 - 0v
    Pin 8 - Blu_on - 0v
    Pin 7 - PS on - 0v
    Pin 6 - ground
    Pin 5 - ground
    Pin 4 - ground
    Pin 3 - 19v - 18.6
    Pin 2 - 19v - 18.6
    Pin 1 - 19v - 18.6

    I'm GUESSING Blu_on is my 5v? What's that stand for?

    Here is a picture.

    What do I test now? I haven't been able to locate the service manual yet. Thanks in advance for all your help.
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Sharp LC48LE551U

      BLU = Backlights ON.
      This LED Backlights TV may use 19V STBY.
      Can we see the whole backside of the TV so we can see how all the boards are connected together?
      Also need clearer pictures that are in focus.
      Last edited by budm; 02-08-2015, 11:56 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

        • simcole
          Member
          • Apr 2014
          • 30
          • United States
          #3
          Re: Sharp LC48LE551U

          Here is a photo. I'm trying to get this thing in focus. I need to wait until daylight to get some better lighting. If this used 19v standby then maybe the main is bad somewhere.
          Attached Files

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Sharp LC48LE551U

              Sigh, another example of the "clone wars"; a Sharp branded TV that's not made by Sharp, but the lowest bidder in China.
              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

                • simcole
                  Member
                  • Apr 2014
                  • 30
                  • United States
                  #5
                  Re: Sharp LC48LE551U

                  Does that mean nobody can help? I could really use a little guidance as searching here for a similar design has turned up nothing and since I can't find the service manual.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: Sharp LC48LE551U

                      Right now it points to the problem on the main board, it is not sending command signals to turn on the main power supply.
                      You can try and see if the main board has any fuses, 3-PIN Voltage regulators C that need to be check, also try disconnecting the cable to the T-CON board and see what happen.
                      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

                        • simcole
                          Member
                          • Apr 2014
                          • 30
                          • United States
                          #7
                          Re: Sharp LC48LE551U

                          Originally posted by budm
                          Right now it points to the problem on the main board, it is not sending command signals to turn on the main power supply.
                          You can try and see if the main board has any fuses, 3-PIN Voltage regulators C that need to be check, also try disconnecting the cable to the T-CON board and see what happen.
                          Wow, thank you for the response. I though I was on my own. Anyway, there are no fuses or 3pin VR's on it. I disconnected the T-Con and nothing happened. I checked voltages on P_ON and BLU_ON while pressing power, nothing happened. I suppose it might be time to buy a new board, but I wish there were something else to check first. Any last ideas anyone?

                            Comment

                            • nomoresonys
                              Badcaps Legend
                              • Jan 2013
                              • 12075
                              • U.S.
                              #8
                              Re: Sharp LC48LE551U

                              like Budm says, sure looks like a mainboard issue, they can be a bear to trace down to component, a new board is probably the way to go.

                                Comment

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