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    #1

    Trouble identifying IC on Samsung tcon board

    Hi,
    I have a Tcon board, 2009FA7M4C4L V0.9, out of a 46B7020. I got the TV with a fault and managed to repair it however I noticed some thin horizontal lines. So as I was trying to reposition the cables from the Tcon to the LCD an IC let out the magic smoke!
    I'm having trouble identifying it. The markings on it are 17989 A851 and it has 32 pins. It's between the 2 ribbon connectors that go to the LCD and marked as IC18.

    Any help identifying it, and/or suggesting a replacement would be appreciated.

    Apologies for the not so great photos!

    Thanks
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    #2
    Re: Trouble identifying IC on Samsung tcon board

    Originally posted by Ecorecycler View Post
    Hi,
    I have a Tcon board, 2009FA7M4C4L V0.9, out of a 46B7020. I got the TV with a fault and managed to repair it however I noticed some thin horizontal lines. So as I was trying to reposition the cables from the Tcon to the LCD an IC let out the magic smoke!
    I'm having trouble identifying it. The markings on it are 17989 A851 and it has 32 pins. It's between the 2 ribbon connectors that go to the LCD and marked as IC18.

    Any help identifying it, and/or suggesting a replacement would be appreciated.

    Apologies for the not so great photos!

    Thanks
    Seen this issue with lines before on these sets, If they are black and run left to right with equal spacing I am sure the panel is faulty.

    P.S just get another TCON... Unless you are very competent on soldering fine pitch components
    Last edited by newtothis; 02-15-2015, 05:26 PM.

    Comment

      #3
      Re: Trouble identifying IC on Samsung tcon board

      Thanks for the response.

      I did a littledigging and found a lot of posts about this being a panel fault, however after looking at the following video I wasn't too sure,

      https://www.youtube.com/watch?v=j7vl7-vZEL8

      I've soldered quite a few smd components using solder wick. It seems a shame to sell this TV for parts when I may be able to salvage it. I'd like to minimise any waste. A second hand Tcon board will set me back about $50, the component is probably around $1 and as I'm a student I'm on a tight budget.

      Does anyone know what this IC does? It looks like it connects between the left and right ribbons. Maybe it makes sure the left and right data is displayed (lines held/refreshed) at the same time?

      Thanks

      Comment

        #4
        Re: Trouble identifying IC on Samsung tcon board

        I think it's i7989

        Comment

          #5
          Re: Trouble identifying IC on Samsung tcon board

          Hi,
          Thanks. That's very helpful. I can't seem to find any data on it or figure out what it does.
          Maybe a gamma buffer? I'm new to LCD repairs so still learning.
          I did find a few for sale on aliexpress though.
          I think I'm going to buy this one and try it out,

          http://www.aliexpress.com/item/I7989...025687676.html

          It would still be useful if anyone has any opinions on the youtube video I linked to in an earlier post. I couldn't clearly see what he was doing with the tape. I think it was just to apply more pressure to make the connection, but it seemed like he was covering some of the contacts which seems counter intuitive. I blew the original part as I was trying to reposition the ribbon while the TV was on and it must has shorted the chip. Any ideas?

          Thanks again
          Last edited by Ecorecycler; 02-16-2015, 05:30 AM. Reason: added gamma info

          Comment

            #6
            Re: Trouble identifying IC on Samsung tcon board

            I ordered the part yesterday and will post back on here after I've installed it.

            I'd still like to hear some opinions on what anyone thinks about the youtube video I linked to. Especially in regards to getting rid of the horizontal thin black lines.

            Thanks

            Comment

              #7
              Re: Trouble identifying IC on Samsung tcon board

              Originally posted by Ecorecycler View Post
              I ordered the part yesterday and will post back on here after I've installed it.

              I'd still like to hear some opinions on what anyone thinks about the youtube video I linked to. Especially in regards to getting rid of the horizontal thin black lines.

              Thanks
              well it is a samsung so bad panel is on the cards and being a 46" which seems to be a size with issues. I've got a samsung panel chinese Tv, 46", 2011 ERA 3d, AND THE PANEL IS SHOT, horizontal lines. Kogan TV, thread is still fairly recent so there's some shots in that to have a look at if you want to have a look.Swapped the tcon with no change.
              Last edited by tw2005; 02-17-2015, 06:14 AM.

              Comment

                #8
                Re: Trouble identifying IC on Samsung tcon board

                Hi,

                Thanks for the reply. I just looked at the following Kogan TV thread,

                https://www.badcaps.net/forum/showth...light=kogan+tv

                It doesn't appear to be the same problem. The panel isn't 3D either. The problem I had is more like the image at 6.52 in the youtube video above. Evenly spaced back lines that look about a pixel in height. The TV was still watchable like this. The i7989 blew when I tried moving the ribbon. At 5.27 in the above video, he attaches some tape to cover about half a dozen contacts on the ribbon. He claims to get rid of a double image and the horizontal lines. Quite a few people have thanked him in the comments.
                I'll wait until I get the new component and fit it. I'll then post an photo of the screen when I get it running.

                Thanks

                Comment

                  #9
                  Re: Trouble identifying IC on Samsung tcon board

                  interesting fix, better than bad tab bonds but generally I stay away from LCDs, just happened to get that kogan for free to play with

                  Comment

                    #10
                    Re: Trouble identifying IC on Samsung tcon board

                    So, I guess instead of applying pressure on the bad tab bonds, he's just insulated the lines with a bit of tape from the ribbon end. So, using this method he'd lose a few lines on one side of the screen?
                    Not sure if this would help me.
                    I'm curious why you avoid LCDs?Do you prefer Plasma TVs?

                    Comment

                      #11
                      Re: Trouble identifying IC on Samsung tcon board

                      Originally posted by Ecorecycler View Post
                      So, I guess instead of applying pressure on the bad tab bonds, he's just insulated the lines with a bit of tape from the ribbon end. So, using this method he'd lose a few lines on one side of the screen?
                      Not sure if this would help me.
                      I'm curious why you avoid LCDs?Do you prefer Plasma TVs?
                      As far as things to fix I just find Plasma Tv more to my liking and I've never quite liked the LCD displays for TV. Been caught out with bad panels a couple of times.
                      I'm very much biased towards Panasonic Plasmas so I don't get too involved with LCD TV posts

                      I don't think he's doing that instead of tab bonds, looks like bad connection at the tcon.

                      Comment

                        #12
                        Re: Trouble identifying IC on Samsung tcon board

                        I've not worked on a plasma yet, but think it could be interesting.
                        No doubt I'll be posting on here for advice when I get stuck on one.

                        Comment

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