Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

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  • ChrisCopper
    New Member
    • Apr 2016
    • 7
    • Canada

    #1

    Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

    hey guys,

    Ive been a long time lurker, I am a repair tech and I like to help people out when I can.

    I have the above said set, given to me from a frustrated customer who has had it into 3 different shops and no joy on the repair. pretty odd I thought.

    anyway, the symptom is as follows.

    when the set is totally cold, it fires on no problem and will stay lit sometimes for up to 5 full mins , sometimes more sometimes less. then it starts power cycling. When it cycles the led light and shut down. There is no real code happening here, the set just power cycles every 15 to 20 seconds and tries to start with no joy.

    i have the set fully apart and the lcd panel removed. i can see any issues with the led wiring. if I dont try to start the set the stby is correct 3.3vdc and is sitting there.

    if i unplug the lamps i get the 1 long 1 short error code, but when I plug them in it just repeats the behavior.

    so, any tips? ive looked over the power supply, nothing is getting hot, caps seem fine, esr levels are all good, and capacitance also seems fine. This does seem like a capacitor issue to me thats for sure so Im wondering if i should change them anyway just to see. other than that I cannot find a single thing wrong at the point.

    any help appreciated if anyone has seen this before.

    cheers,

    chris
    Electronic Repair Services
    Chris Annis
    cpurepair@rogers.com
    "always willing to help someone out"
  • maxvalutech
    Badcaps Veteran
    • Dec 2014
    • 804
    • australia

    #2
    Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

    Surely sounds like a dry joint but the guys will need photos etc to respond properly.

    Comment

    • R_J
      Badcaps Legend
      • Jun 2012
      • 9515
      • Canada

      #3
      Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

      I guess you could try disconnecting the lvds cable from the t-con and see if the tv stays on, I know some of the panels have problems with the drive ic's that are on the panel ribbons on the side, I have seen one where one of the ic's would get hot and sht down the tv.

      Comment

      • ChrisCopper
        New Member
        • Apr 2016
        • 7
        • Canada

        #4
        Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

        well I have the panel totally dis connected and the lights are acting the same.

        it sure seems like solder on an IC or something. I guess a question would be, is there a particular IC that could control these led , then over heat and act up?
        Electronic Repair Services
        Chris Annis
        cpurepair@rogers.com
        "always willing to help someone out"

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

          Need to see the pictures of the whole back side of the TV showing how all the boards are connected together, that will a starting point.
          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

          • dskall
            Badcaps Legend
            • Oct 2016
            • 2905
            • usa

            #6
            Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

            I think I would apply some freeze spray around the mainboard.
            I assume no responsibility for any stupid suggestions I might post.

            Comment

            • ChrisCopper
              New Member
              • Apr 2016
              • 7
              • Canada

              #7
              Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

              here are a few pics. have everything connected but the panel itself and it behaves the exact same way.

              I'm almost positive it's a thermal issue I'm just not sure what chips would make the set behave this way.

              I'm thinking the freeze spray is a good idea as well.
              Attached Files
              Electronic Repair Services
              Chris Annis
              cpurepair@rogers.com
              "always willing to help someone out"

              Comment

              • ChrisCopper
                New Member
                • Apr 2016
                • 7
                • Canada

                #8
                Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                here is a better pic of board layout.
                Attached Files
                Electronic Repair Services
                Chris Annis
                cpurepair@rogers.com
                "always willing to help someone out"

                Comment

                • ChrisCopper
                  New Member
                  • Apr 2016
                  • 7
                  • Canada

                  #9
                  Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                  anyone have any idea? I'm pretty sure I have a cold joint on an IC on the main board but my question is which one?
                  Electronic Repair Services
                  Chris Annis
                  cpurepair@rogers.com
                  "always willing to help someone out"

                  Comment

                  • rievax_60
                    Badcaps Veteran
                    • May 2012
                    • 897
                    • australia

                    #10
                    Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                    A similar model has a common fault that affects the AC_DET. If it also uses an opto-coupler for the AC_DET try heating it.

                    Comment

                    • ChrisCopper
                      New Member
                      • Apr 2016
                      • 7
                      • Canada

                      #11
                      Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                      Originally posted by rievax_60
                      A similar model has a common fault that affects the AC_DET. If it also uses an opto-coupler for the AC_DET try heating it.
                      ok I'll look into this!!
                      Electronic Repair Services
                      Chris Annis
                      cpurepair@rogers.com
                      "always willing to help someone out"

                      Comment

                      • 280zx
                        Member
                        • May 2020
                        • 43
                        • US

                        #12
                        Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                        I have the same set with the same problem. When I got it it had no power to the unit so I replaced the power supply. Now it turn on for about 4-5 minutes then turns off. After a few it turn on again and repeats the on and off cycle. Do you figure it out?

                        Comment

                        • 280zx
                          Member
                          • May 2020
                          • 43
                          • US

                          #13
                          Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                          I have the same set with the same problem. When I got it it had no power to the unit so I replaced the power supply. Now it turn on for about 4-5 minutes then turns off. After a few it turn on again and repeats the on and off cycle. I also noticed that the power button on the set does not work. Did you figure it out?

                          Comment

                          • kgavionics
                            Senior Member
                            • Apr 2017
                            • 152
                            • Canada

                            #14
                            Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                            Originally posted by 280zx
                            I have the same set with the same problem. When I got it it had no power to the unit so I replaced the power supply. Now it turn on for about 4-5 minutes then turns off. After a few it turn on again and repeats the on and off cycle. I also noticed that the power button on the set does not work. Did you figure it out?
                            Does the front led flashes before the tv goes off? if yes !how many times does it flash?

                            Comment

                            • 280zx
                              Member
                              • May 2020
                              • 43
                              • US

                              #15
                              Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                              No flashing lights. I turned it on and it worked for 3 minutes and turn off. After 3 minutes it turns on for 10 seconds and then cycles on and off every 5 seconds. I'm able to get the menu screen during the on cycle.
                              Last edited by 280zx; 06-29-2020, 12:06 PM.

                              Comment

                              • 280zx
                                Member
                                • May 2020
                                • 43
                                • US

                                #16
                                Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                                Update TV runs for 3 minutes then turns off. At this point it tries to come back on every 5 seconds. At the 3 minute mark it come on for 3 minutes and keeps repeating the process.

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12081
                                  • U.S.

                                  #17
                                  Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                                  If you can find a backlight NOT brightness setting try turning it down see if tv stays on longer if not turn it up and see what it does.

                                  Comment

                                  • 280zx
                                    Member
                                    • May 2020
                                    • 43
                                    • US

                                    #18
                                    Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                                    Lowered backlight setting all the way and now TV runs for 14 minutes then turns off. At this point it tries to come back on every 5 seconds. At the 1 minute mark it came on for 14 minutes again and keeps repeating this process. When I turned the backlight setting all the way up TV ran for 8 minutes then turns off. At this point it tries to come back on every 5 seconds. At the 1 minute mark it came on for 8 minutes again and keeps repeating this process.

                                    Comment

                                    • nomoresonys
                                      Badcaps Legend
                                      • Jan 2013
                                      • 12081
                                      • U.S.

                                      #19
                                      Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                                      Backlight problem, you probably need to replace the backlight strips.

                                      Comment

                                      • 280zx
                                        Member
                                        • May 2020
                                        • 43
                                        • US

                                        #20
                                        Re: Sharp Aquos Quattron LC-52LE810UN power cycle odd issue

                                        Wouldn't I get sound during the time it goes off if it was the backlights?

                                        Comment

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