Sharp Aquos LC-70C6400U Half Screen Dark

Collapse
This topic has been answered.
X
X
 
  • Time
  • Show
Clear All
new posts
  • scubacamper
    New Member
    • Mar 2025
    • 7
    • USA

    #1

    Sharp Aquos LC-70C6400U Half Screen Dark

    I found another post on this site the other day which has been very helpful in troubleshooting this issue I am having with my tv. The left half of the screen is dark, and the other half is VERY slow to generate it's image - and it only generates part of its image at that.
    Based on this yt video, I have narrowed it down to an issue (short?) on the left side of the display, somewhere in the system of ribbon cables.
    when I remove the bezel and the rear cover, I can get the image to display correctly by manipulating the ribbon cables on the left side which connects the left lower display board with the upper one (sorry, I dont know what thats called).
    When I removed that “jumper” ribbon cable and observed it under magnification, I noticed that the white piece which stiffens the cable end was slightly off-square with the ribbon cable itself and gingerly removed it and replaced it perfectly square back on the ribbon cable. When I reconnected it, plugged the tv back in and turned it on, the screen had a normal appearance. I agitated all pieces within that assembly, and nothing I did caused the issue to return. Accordingly, I reassembled the TV except for the back panel, and tested it again before final reassembly, and observed the issue had returned.
    Pressing on the connections had no effect.
    I removed the bezel once again, removed the metal frame piece again, and began inspecting all connections but found nothing out of the ordinary. I plugged the tv back in and turned it on to see the issue was still present as before. I started touching, pressing, and moving those side boards & ribbon cables, and noticed if I squeeze the “jumper” connector on the lower board, the picture returns to normal, but as soon as I let go, the display issue returns.
    Before I throw in the towel on these side boards and proceed with the tape hack mentioned in the video, I wanted to post my issue here to see what y'all thought.
    thanks so much for reading this far and I look forward to your suggestions and/or insight!

    TV: Sharp Aquos LC-70C6400U
    I will try to post pictures shortly; I didn't want to lose my progress…
    Last edited by SMDFlea; 05-03-2025, 04:21 PM. Reason: Sharp Aquos LC-70C6400U
  • Answer selected by scubacamper at 05-05-2025, 12:03 PM.
    nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12137
    • U.S.

    I guess the question is, is there some bad solder/s or is the connector no longer able to hold the the ribbon securely?

    Comment

    • scubacamper
      New Member
      • Mar 2025
      • 7
      • USA

      #2
      First Image shows general location of “side display boards” and “jumper” ribbon cable.
      second shows close up of “jumper” ribbon cable.

      Comment

      • nomoresonys
        Badcaps Legend
        • Jan 2013
        • 12137
        • U.S.

        #3
        If you get a good picture by "manipulating" I think you mean holding down on where they connect. You need to find a way to keep that pressure on. Some use good strong tape, use to be easier when tvs had actual frames to them. The tab bonds can become loose and proper connection is lost. Check youtube for bad/loose tab bonds or the like.

        Comment

        • scubacamper
          New Member
          • Mar 2025
          • 7
          • USA

          #4
          If I squeeze the connector with the cable hooked up, the picture returns to normal.
          could this possibly be a bad solder joint fixed by reflowing that portion of the board?

          Comment

          • scubacamper
            New Member
            • Mar 2025
            • 7
            • USA

            #5
            Originally posted by nomoresonys
            If you get a good picture by "manipulating" I think you mean holding down on where they connect. You need to find a way to keep that pressure on. Some use good strong tape, use to be easier when tvs had actual frames to them. The tab bonds can become loose and proper connection is lost. Check youtube for bad/loose tab bonds or the like.
            I added a mini binder clip and removed the ears. This was holding great, keeping the picture 100% normal until I snapped the front bezel back on, which seems to have caused it to mess up again.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12137
              • U.S.

              #6
              Ok, so you meant if you hold pressure on the connector it clears up? In that case you can try adding like a bit of paper on the side without the shiny connections of the end of cable that goes into connector to give it a better/tighter fit.

              Comment

              • scubacamper
                New Member
                • Mar 2025
                • 7
                • USA

                #7
                Are those ribbon cable jacks able to be reflowed?

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12137
                  • U.S.

                  #8
                  Have not tried it myself, looks like it could be pretty tricky. saw this in a quick search: https://www.youtube.com/watch?v=nju86ZZVQHY

                  Comment

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12137
                    • U.S.

                    #9
                    I guess the question is, is there some bad solder/s or is the connector no longer able to hold the the ribbon securely?

                    Comment

                    • scubacamper
                      New Member
                      • Mar 2025
                      • 7
                      • USA

                      #10
                      Originally posted by nomoresonys
                      I guess the question is, is there some bad solder/s or is the connector no longer able to hold the the ribbon securely?
                      exactly what I was thinking…. I’ve been trying to find a way to wedge something in there to make it hold tighter. Tried the binder clip but it wasnt consistent and when I went to hang that beast on the wall (84lbs - not fun trying to do it yourself!), the “fix” unfixed.
                      Annoyed, I started removing screws while it hung on the wall since I knew where the root of the problem lay. I got it apart and the bezel partially pulled away and started fiddling with that ribbon “clamp” (?). As luck would have it, when I unlocked it and started to disconnect the ribbon cable, the pins must have found their proper spot and the tv magically started working fine.
                      I immediately stopped everything and started gingerly putting it back together.
                      over 7 hours of constant screen usage later and it still works. That damn thing will stay right where it’s at - I aint touching it again unless it fouls up again. Might even leave it on the wall when we move

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12137
                        • U.S.

                        #11
                        Lol, sounds like a plan, maybe it just wasn't lined up correctly or there was a dirty/bad connection that got better with the moving around.

                        Comment

                        • bohaboha
                          Badcaps Veteran
                          • Nov 2012
                          • 973
                          • sweden

                          #12
                          just leave it as it is loool

                          Comment

                          Related Topics

                          Collapse

                          • claytongarcia
                            Issue with Sharp LC-42SB45U
                            by claytongarcia
                            Hello everyone,

                            I recently got a model Sharp TV, and I've noticed that the green power LED is flashing without any specific pattern. Additionally, there appears to be no voltage coming from the power board. I haven't observed any leaking or bulging capacitors, although the top of the larger capacitor doesn't seem to be perfectly flush with the jacket—if that makes sense.

                            Has anyone dealt with this issue before?​
                            03-10-2025, 07:27 PM
                          • ninja_zx11
                            Sharp LC-70LE650U vertical black and red bars
                            by ninja_zx11
                            Hi all,

                            70" LED TV is Sharp LC-70LE650U.

                            Initial problem was horizontal lines and slow motion lurrs on the bottom left of the screen. So I removed both the left and right ribbon cables from the T-con board and tried to clean it with alcohol and when I put it back, this issue appeared. I tried carefully reinserting the ribbon bon cables but same thing. I checked the traces of the ribbon cables with magnifying glass and everything looks good. I cleaned the small jumper ribbon cable on the left side of the screen which cured the horizontal line and slow motion blurs...
                            07-07-2023, 11:27 PM
                          • Tr0ll
                            T-con suspect issue. Both ribbon cables no picture. One ribbon cable ok. (58pus8545)
                            by Tr0ll
                            Hi guys! I realized you have a lot of knowledge here so i am hoping you could point me in right direction with my odd issue.

                            The Tv is a Philips 58PUS8545/12, it had no picture but working backlights.

                            Original T-con:
                            Opened the Tv and tested to unplug one ribbon cable at a time. With this test i could see that i got fine picture on both halves as long as there was only one ribbon cable connected, with two connected picture were gone.

                            First replacement T-con:

                            I thought it might be t-con and ordered new t-con from china(supposedly tested)...
                            10-07-2023, 07:48 PM
                          • jonah1024
                            Sharp Aquos LC-40UG7252E LCD TV burn in?
                            by jonah1024
                            Hello!

                            I'm a few days old into this TV screens repair universe so please bear with me.

                            Recently, and all of a sudden my 40” 4K Sharp Aquos LCD TV turned on with colors all smudged in some places on the screen that remain like that even without any kind of video source. I do have image but the colors are smudged/tinted/ washed out in patches as per defects. This to me looks similar to burn in but I’m shore this is not an OLED.

                            - I did the classic unplug and hold power button to discharge the caps but it didn't help.
                            - I did a factory reset as well...
                            07-16-2024, 04:23 AM
                          • leorivers
                            Issue with Sharp LC-47SB57UT
                            by leorivers
                            Hello,
                            I bought Sharp LC-47SB57UT 6 years ago. I had to have a vhf antenna to pick up one local station(koco channel 5 OKC). It has worked great up until a week ago. Sometimes I couldn't get channel 5, now I can't receive it at all. I can hook up a digital convertor box I have from another tv and can receive channel 5.
                            I think the antenna and cable is ok. I doubt that this would be the tuner board or possibly something else.

                            Any ideas where I should start?​
                            10-24-2024, 03:11 AM
                          • Loading...
                          • No more items.
                          Working...