Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

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  • pk7tanner
    Senior Member
    • Apr 2013
    • 98
    • United States

    #1

    Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

    I had made a previous post about this set https://www.badcaps.net/forum/showthread.php?t=43199
    Well, the problem was getting worse, so I tried entering into the factory reset mode while it was happening. When I couldn't get it to fix the problem, I just turned the set off. Now it won't even power on. When I try to reenter reset mode, it turns on for 2 seconds, then shuts off.
    Also, while browsing the Sharp manuals, I haven't been able to find one that is similar to this model.
    Attached Files
  • pk7tanner
    Senior Member
    • Apr 2013
    • 98
    • United States

    #2
    Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

    Found the manual, so please disregard that.

    Comment

    • pk7tanner
      Senior Member
      • Apr 2013
      • 98
      • United States

      #3
      Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

      Bump
      Hopefully someone has a little insight for me.

      Comment

      • nuala
        Member
        • Aug 2013
        • 37
        • USA

        #4
        Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

        Any blinking code?

        Comment

        • newtothis
          Badcaps Legend
          • Mar 2013
          • 1556
          • england

          #5
          Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

          Multimeter to hand?

          Comment

          • pk7tanner
            Senior Member
            • Apr 2013
            • 98
            • United States

            #6
            Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

            No blinking code other than the front power LED blinking at a constant rate.
            Yes, I have a multimeter.

            Comment

            • newtothis
              Badcaps Legend
              • Mar 2013
              • 1556
              • england

              #7
              Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

              Connector from PSU to Main. Check pins at PSU side with DMM set to DCV. If there are voltages written by the connector write the results out like this for EG:

              12v - 0v
              PS_ON - 3v
              STBY - 5v

              etc
              etc

              You labels may vary

              Comment

              • pk7tanner
                Senior Member
                • Apr 2013
                • 98
                • United States

                #8
                Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                Sorry for taking so long. The only one with voltage is the BU5V which has 5v.
                I have another question. I was checking the MOSFETs on the power board. Since I'm a novice and can't decipher data sheets, I check them against their matching counterpart. One of the st 13nm60n gives a reading of .955, while the others read OL. I'll attach a photo of the suspect fet.
                Attached Files

                Comment

                • pk7tanner
                  Senior Member
                  • Apr 2013
                  • 98
                  • United States

                  #9
                  Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                  Here's the data sheet. http://www.st.com/web/en/resource/te...CD00261517.pdf
                  If someone can give me the v readings I should get, that would work as well.

                  Comment

                  • newtothis
                    Badcaps Legend
                    • Mar 2013
                    • 1556
                    • england

                    #10
                    Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                    Before we jump into MOSFET testing etc can you provide the voltage readings in the format of post #7 please. This way we can see what the pin labels are

                    Comment

                    • pk7tanner
                      Senior Member
                      • Apr 2013
                      • 98
                      • United States

                      #11
                      Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                      OK

                      UR13V = 0
                      UR13V = 0
                      UR13V = 0
                      UR13V = 0

                      ACDET = 0
                      PS_ON = 0
                      BU5V = 5v
                      PNL_PWR = 0

                      UR13V = 0
                      UR13V = 0

                      PNL12V = 0
                      PNL12V = 0

                      No voltage on any of them other than BU5V which had 5 volts
                      Last edited by pk7tanner; 05-29-2015, 02:30 PM.

                      Comment

                      • newtothis
                        Badcaps Legend
                        • Mar 2013
                        • 1556
                        • england

                        #12
                        Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                        OK does the PS_ON pin get any voltage with all boards connected and you attempt to power the set up?

                        Comment

                        • pk7tanner
                          Senior Member
                          • Apr 2013
                          • 98
                          • United States

                          #13
                          Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                          If the set is plugged in, you get no response from the buttons. There's just the flashing green light at the front.
                          I'll have to wait until someone can help me push the power button while I hold the dmm lead
                          Last edited by pk7tanner; 05-29-2015, 05:17 PM.

                          Comment

                          • pk7tanner
                            Senior Member
                            • Apr 2013
                            • 98
                            • United States

                            #14
                            Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                            No the set turns on and immediately goes into safe mode or whatever mode it's in. Hitting the buttons shows nothing.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Sharp LC-52LE700UN was working with an occasional white screen issue, stopped

                              Service manuals:
                              http://elektrotanya.com/?q=showresul...at2=schematics

                              Are you sure that the blinking LED does not have any flashing pattern?
                              I expect AC DET to be around 3V but not 100% 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

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