Replacing a bad cap on TV

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #41
    Re: Replacing a bad cap on TV

    Without seeing a video of the problem that exactly represents what you are getting it's really hard for me to suggest whether it is a panel or main board fault.
    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.

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    • justjoe
      Member
      • May 2013
      • 35
      • England

      #42
      Re: Replacing a bad cap on TV

      Originally posted by tom66
      Without seeing a video of the problem that exactly represents what you are getting it's really hard for me to suggest whether it is a panel or main board fault.
      ok i will leave it off for a couple of days and see if i can get a picture again, thanks Tom.

      Comment

      • justjoe
        Member
        • May 2013
        • 35
        • England

        #43
        Re: Replacing a bad cap on TV

        just noticed that this screen panel board seem to be missing some of those spongy pressure pads, the pic shows where 1 is missing, and each end of the board has no pressure pads but has similar gold paint as if they should have some.

        These pads have not fallen off and been lost by me, i just know that they are either missing from the factory or its designed this way so i could try making my own pad for it.



        I
        Attached Files

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        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #44
          Re: Replacing a bad cap on TV

          Looks like there's a screw hole there, so there wouldn't be a pad there anyway.

          The pads aren't for pressing on the tabs or holding the board in place. They are there simply to reduce the interference that driving the panel produces by completing the shield around the panel.
          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

          • justjoe
            Member
            • May 2013
            • 35
            • England

            #45
            Re: Replacing a bad cap on TV

            Originally posted by tom66
            Looks like there's a screw hole there, so there wouldn't be a pad there anyway.

            The pads aren't for pressing on the tabs or holding the board in place. They are there simply to reduce the interference that driving the panel produces by completing the shield around the panel.
            you're right i see the metal surround has bulges where the pads go now.

            ive just managed to get a video recording of the problem, i will update this post with it soon.

            Comment

            • justjoe
              Member
              • May 2013
              • 35
              • England

              #46
              Re: Replacing a bad cap on TV

              Heres the video, you dont see much but the word "scart" appears in the bottom left corner.

              If I had left it unplugged for another 12 hours or more the picture would have stayed on for a few seconds longer, in fact if i unplug it for 1 week the picture is ok for about 30 seconds then it fades away.

              http://www.youtube.com/watch?v=sv-R_...ature=youtu.be


              My noob guess is that it seems like something is overheating, or a cap is bad but it will run for a few seconds when very cold.
              Last edited by justjoe; 05-10-2013, 09:28 AM.

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              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #47
                Re: Replacing a bad cap on TV

                That is an odd one -- I haven't seen that before. Is there any chance you could get it playing sound then try to show a video.. need to see if the video freezes before it fades or not (if it's freezing it might be a T-con problem.) And the backlight is full brightness all the time through this. Very strange.
                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

                • justjoe
                  Member
                  • May 2013
                  • 35
                  • England

                  #48
                  Re: Replacing a bad cap on TV

                  Originally posted by tom66
                  That is an odd one -- I haven't seen that before. Is there any chance you could get it playing sound then try to show a video.. need to see if the video freezes before it fades or not (if it's freezing it might be a T-con problem.) And the backlight is full brightness all the time through this. Very strange.
                  I can get sound but no picture, before i get to the channel any kind of picture has come and gone already, unless i unplug it for a week.

                  Also its not freezing the video, i remember that i was able to scroll the menu while it was fading away.

                  yes backlight is very bright but you cant see it in the video.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #49
                    Re: Replacing a bad cap on TV

                    Maybe it's time to get a can of freeze spray. Poundland nearby me have them for a quid for 200ml.
                    You can spray the freeze spray around the panel and locate the temperature sensitive part.
                    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

                    • justjoe
                      Member
                      • May 2013
                      • 35
                      • England

                      #50
                      Re: Replacing a bad cap on TV

                      Originally posted by tom66
                      Maybe it's time to get a can of freeze spray. Poundland nearby me have them for a quid for 200ml.
                      You can spray the freeze spray around the panel and locate the temperature sensitive part.
                      I'll look into it thanks. Im thinking the problem is somewhere between the cable to th e screen form the mobo or something on the mobo itself, worth replacing the mobo if i find one, i saw a power supply board for only Β£25 on ebay, but out of interest id love to know what the problem is on the board.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #51
                        Re: Replacing a bad cap on TV

                        I would doubt it myself that it is the motherboard, the symptoms do not match up. But that's part of the diagnosis process. The motherboard in your TV is used in about fifty million different TVs. I've seen it in baby 19" and 24" as well. Go by the part numbers written on it, not the model of your TV.
                        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

                        • justjoe
                          Member
                          • May 2013
                          • 35
                          • England

                          #52
                          Re: Replacing a bad cap on TV

                          Originally posted by tom66
                          I would doubt it myself that it is the motherboard, the symptoms do not match up. But that's part of the diagnosis process. The motherboard in your TV is used in about fifty million different TVs. I've seen it in baby 19" and 24" as well. Go by the part numbers written on it, not the model of your TV.
                          of course yea i forgot about that, i heard that somewhere, thanks, i just hope its not the screen.

                          Comment

                          • justjoe
                            Member
                            • May 2013
                            • 35
                            • England

                            #53
                            Re: Replacing a bad cap on TV

                            Originally posted by tom66
                            I would doubt it myself that it is the motherboard, the symptoms do not match up. But that's part of the diagnosis process. The motherboard in your TV is used in about fifty million different TVs. I've seen it in baby 19" and 24" as well. Go by the part numbers written on it, not the model of your TV.
                            You are not gonna believe this but the TV is now working ok, i turned it on to try to capture more footage of it fading but its working ok, im sure this wont last though.

                            edit: this is so annoying, it obviously isnt fixed but seems to be working ok.

                            since it didnt work yesterday i haven't touched it, only pulled the plug out, so it cant be a loose connection.

                            im going to post a video showing the tv now working, at least then you can see it does work at times.
                            Last edited by justjoe; 05-11-2013, 08:51 AM.

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #54
                              Re: Replacing a bad cap on TV

                              A fault that goes away by itself can just as easily come back by itself; though, it may have been a loose cable, I would be surprised.
                              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

                              • justjoe
                                Member
                                • May 2013
                                • 35
                                • England

                                #55
                                Re: Replacing a bad cap on TV

                                Ok heres the video of it working, not much help i know but proves im not imagining things lol

                                In the video I turned the brightness and contrast up in the hope it would overload whatever is faulty, just a noob test.

                                http://www.youtube.com/watch?v=BbLmd...ature=youtu.be

                                ive been playing a movie via USB drive for past 10 minutes and so far its working ok so far, i guess when i screw it back together it will go faulty again.
                                Last edited by justjoe; 05-11-2013, 09:47 AM.

                                Comment

                                • justjoe
                                  Member
                                  • May 2013
                                  • 35
                                  • England

                                  #56
                                  Re: Replacing a bad cap on TV

                                  Well hopefully this is my last post on this, it seems like playing around with the ribbon you spoke about has fixed it, im getting a slight screen flash though, its like when you videotape a computer monitor and on playback you get those dark bands flashing because the frame rates are different, well its like that but very slight, but it only does it when the TV has been screwed back together, so theres clearly some kind of ill fitting part, even though everything is exactly the same, screws all the same torque, no bent plastic or metal anywhere, no trapped wires etc, lcd flats seem to be so temperamental.

                                  I hope this thread might help others because ive learned a lot of important stuff from you guys, thanks for your time and patience.

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #57
                                    Re: Replacing a bad cap on TV

                                    I'd only put four screws in it (four corners) for now, it may go wrong again and you may need to apply a more permanent shim.
                                    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

                                    • justjoe
                                      Member
                                      • May 2013
                                      • 35
                                      • England

                                      #58
                                      Re: Replacing a bad cap on TV

                                      Originally posted by tom66
                                      I'd only put four screws in it (four corners) for now, it may go wrong again and you may need to apply a more permanent shim.
                                      Yea thats what ive done but im going to be playing with it more yet to cure this new dark band problem, the fact i got rid of it shows both problems ive had is down to bad connection/contact. Gonna brainstorm it and see if I can spot a design flaw or something, but im happy to fix the main problem.

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #59
                                        Re: Replacing a bad cap on TV

                                        It uses a crappy cheap Chimei Opto (Innolux) panel, they have lots of tab bond problems.
                                        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

                                        • justjoe
                                          Member
                                          • May 2013
                                          • 35
                                          • England

                                          #60
                                          Re: Replacing a bad cap on TV

                                          Originally posted by tom66
                                          It uses a crappy cheap Chimei Opto (Innolux) panel, they have lots of tab bond problems.
                                          Well since I took those pics of the tabs its been working again, but the pressure on that panel doesn't seem to make any difference to the picture on mine, i cant reproduce the fade out and cant get rid of this flickering, its not usable cos its too distracting even though its very slight.

                                          Comment

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