m3d550kde no picture

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  • birdboy385
    Senior Member
    • Nov 2015
    • 145
    • United States

    #1

    m3d550kde no picture

    Hi everyone sorry i'm new too this so i'll explain everything to the best of my ability.

    Basically i have the above mentioned Vizio tv. I got this in for repair and i'll note when I first plug in the tv. the standby light is fully lit, then blinks 3 times it seems then takes a slight pause then blinks several more times then goes to standby. I'm not sure if there's an indication there of something but figured i'd note it. Once i turn on the tv using the power button on the set, the tv instantly powers on, the standby light indicates on, and the backlights turn on. There however is no picture. After a few seconds the backlight's change intensity which I assume would mean it's completing it's boot sequence.

    My original thought was the mainboard since when i had this type of issue in the past, having backlights without a picture it turned out to be the mainboard so i replaced it and no dice. The tv seemed unchanged so i returned that board.

    Recently I ordered a t-con board. (yes i know without any testing this is horrible troubleshooting). So i hooked everything up and...no dice....or so i thought. I looked at the tv and noticed that there was a couple of 1 -2 inch bars showing up on screen. they were very subtle but they were definitely there and definitely don't show up with the old board. I decided to a bit further and removed one of the ribbon cables that connect to the panel boards and i instantly got a reaction of the one side of the screen being whited out and the other having a set of vertical rainbow lines.

    My thoughts at this point is i potentially got a bad t-con board from the shop I ordered from, but am also concerned that the panel might be at fault. However, my thought is, if it were the panel wouldn't i get the same weird 2 bars or so regardless of whether a t-con board was connected or not and wouldn't getting that weird rainbow effect and white screen also be unrealistic with a bad panel that's been tampered with.

    At this point before i go about ordering a new t-con board and returning the one a just bought I'd like to hear your thoughts. I thank you all in advance for your help.
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: m3d550kde no picture

    Nope not the Tcon Failed Lcd screen not fixable sorry Take the frame off and check the tab bonds make sure they aren't shorting out.
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment

    • birdboy385
      Senior Member
      • Nov 2015
      • 145
      • United States

      #3
      Re: m3d550kde no picture

      that's what i was afraid of. I'll try to do that do you have any suggestions on how to check those or test them? I've heard of people using cold spray to temporaily test the bonds but my access of tools is limited. I don't want to cause more damage to the tabs.

      edit: If you wouldn't mind, I'd like to know what led you to the conclusion that is the panel. I just don't understand why i'd get no image with one t-con board and corrupt image with another board. Not trying to question you I just want to see the logic.
      Last edited by birdboy385; 02-08-2016, 02:09 PM.

      Comment

      • birdboy385
        Senior Member
        • Nov 2015
        • 145
        • United States

        #4
        Re: m3d550kde no picture

        well this doesn't look good. lol i guess i have to agree the display is at fault. I'm hoping the image uploads but there seems to be alot of gunk in here next to this tab . i'm not sure if anythings broken i was going to try cleaning it with alcohol but i'm not sure what caused this. it looks like battery acid but doesn't make sense for that to be like that.
        Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: m3d550kde no picture

          Are the tap bonds on the bottom edge of the panel or on the top edge of the panel?
          It looks like someone cleaned the screen and let the liquid flow down to the boards.
          Last edited by budm; 02-08-2016, 09:35 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

          • birdboy385
            Senior Member
            • Nov 2015
            • 145
            • United States

            #6
            Re: m3d550kde no picture

            ahh the tabs are at the bottom that makes sense. I did clean the tabs but alas it made no difference. I'm thinking it might've shorted the boards out.

            Comment

            • birdboy385
              Senior Member
              • Nov 2015
              • 145
              • United States

              #7
              Re: m3d550kde no picture

              At this point I am agreeing with the consensus that the lcd panel has died due to human error. therefore should i delete this thread? or should i keep this thread here.

              Comment

              • ReeceyBurger123
                Never Give Up !
                • May 2014
                • 7325
                • Britain

                #8
                Re: m3d550kde no picture

                Keep the thread as it will help other in the future.
                Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                https://www.facebook.com/Telford-Tel...7894576335359/

                Comment

                • vinceroger69
                  Badcaps Legend
                  • Mar 2012
                  • 6714
                  • uk

                  #9
                  Re: m3d550kde no picture

                  This seems to happen quite a lot with sets that have the tab bonds on the bottom, people use liquid on the lcd to clean it which runs onto the tabs and corrode them and the circuit board traces etc, its unrepairable its a shame but maybe you can resell any good boards you dont need etc.
                  Dont worry about the thread it has usefull information in for other users etc.

                  Comment

                  • birdboy385
                    Senior Member
                    • Nov 2015
                    • 145
                    • United States

                    #10
                    Re: m3d550kde no picture

                    ok sounds good ya luckily for me the boards for this tv are pretty valuable so it won't be a total loss.

                    Comment

                    • birdboy385
                      Senior Member
                      • Nov 2015
                      • 145
                      • United States

                      #11
                      Re: m3d550kde no picture

                      I thank everyone for their assistance this is a great community and I look forward to participating in the future

                      Comment

                      • birdboy385
                        Senior Member
                        • Nov 2015
                        • 145
                        • United States

                        #12
                        Re: m3d550kde no picture

                        Hey guys I'm reopening this discussion to ask a question. Someone is selling on ebay, the driver panel boards for relatively cheap. I wanted to ask how difficult is it to replace one of those boards?

                        Comment

                        • dick_barton
                          Badcaps Legend
                          • Aug 2015
                          • 6642
                          • Wales

                          #13
                          Re: m3d550kde no picture

                          Driver panel? Selling the whole display panel?
                          Willing to help but I'm no expert.

                          Comment

                          • dick_barton
                            Badcaps Legend
                            • Aug 2015
                            • 6642
                            • Wales

                            #14
                            Re: m3d550kde no picture

                            Originally posted by dick_barton
                            Driver panel? Selling the whole display panel?
                            I see the panel drivers advertised on Ebay but without the specialized tooling to reconnect them to the LCD panel I cannot see any value in them?
                            Willing to help but I'm no expert.

                            Comment

                            • birdboy385
                              Senior Member
                              • Nov 2015
                              • 145
                              • United States

                              #15
                              Re: m3d550kde no picture

                              That's what i'm asking. I don't know what is involved in repairing them or what tools are needed?

                              Comment

                              • dick_barton
                                Badcaps Legend
                                • Aug 2015
                                • 6642
                                • Wales

                                #16
                                Re: m3d550kde no picture

                                Take a look at this site which repair tab bondings. It will give you an idea of what's involved.

                                http://www.febalcdrepair.com/?title=...ding&menuid=13
                                Willing to help but I'm no expert.

                                Comment

                                • birdboy385
                                  Senior Member
                                  • Nov 2015
                                  • 145
                                  • United States

                                  #17
                                  Re: m3d550kde no picture

                                  Thanks for the response. From what it looks like thats a major hell no lol. Unless i could find someone to do it for me which is probably unlikely since it's such a large tv. I don't know if it'd be possible to repair the current board which the corrosion took placwe but...ugh lol

                                  Comment

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