Hi! I'm new here and trying to find some help. I've been searching and I'm just not confident that I've found issues that are exactly like what I have. I was given a Samsung LNT4669FX/XAA with known issues to tinker with to see if I can get it working. Apparently they had some service done to it at some point, but I'm not sure what that work was. I'm familiar with the bad caps issue and have done that repair on another TV before. I checked this one and all of the Caps look fine. So here are my symptoms:
1) When first plugged in, the red light flashes then the TV makes the startup chime sound. The screen will come on but the image is green and snowy then it will click off then back on. It does this several times, eventually the startup sound stops playing and it just makes the click sound. After a little while, it will start up and have a great picture. It seems like a cap issue, but since they aren't damaged, I'm skeptical. Also, once it has warmed up, I can turn it off and back on after a few mins and it powers right on.
2) Once powered up, if I add an input on any of the HDMI ports (haven't tried RCA ports) I will get a few random horizontal lines that will flash of for a split second then go away. I got a video of this. https://youtu.be/Z8dK6gRylg4. I tried 3 HDMI cables and tried my Roku and TiVo and switched the Roku between 720p and 1080p output. Nothing affected the lines. The video shows the Roku main menu and there is some ghosting or something where the menu duplicates and slides off the screen (don't know how to describe this). If I navigate off of the main Roku menu or play video from any Roku app (Netflix, Hulu, etc) or switch over to Tivo, the screen flicker and ghosting goes away and I just have the random horizontal lines that flicker on and off periodically, but there is no other flicker to the picture.
https://youtu.be/Z8dK6gRylg4
As for troubleshooting, at this point I visually checked the caps and they seem fine. I also fully disconnected the T-CON board and the lines don't appear. Just a black screen with a glow around the edges.
The previous owner said it was the main board that was bad, but I'm not sure how he arrived at that conclusion. It feels like I'm dealing with 2 separate issues, but I'm not experienced enough to know for sure. I'd rather not just start swapping out parts willy nilly and I'm guessing there are some other ways to diagnose things to get a better target. Any help would be greatly appreciated.
Thanks!
1) When first plugged in, the red light flashes then the TV makes the startup chime sound. The screen will come on but the image is green and snowy then it will click off then back on. It does this several times, eventually the startup sound stops playing and it just makes the click sound. After a little while, it will start up and have a great picture. It seems like a cap issue, but since they aren't damaged, I'm skeptical. Also, once it has warmed up, I can turn it off and back on after a few mins and it powers right on.
2) Once powered up, if I add an input on any of the HDMI ports (haven't tried RCA ports) I will get a few random horizontal lines that will flash of for a split second then go away. I got a video of this. https://youtu.be/Z8dK6gRylg4. I tried 3 HDMI cables and tried my Roku and TiVo and switched the Roku between 720p and 1080p output. Nothing affected the lines. The video shows the Roku main menu and there is some ghosting or something where the menu duplicates and slides off the screen (don't know how to describe this). If I navigate off of the main Roku menu or play video from any Roku app (Netflix, Hulu, etc) or switch over to Tivo, the screen flicker and ghosting goes away and I just have the random horizontal lines that flicker on and off periodically, but there is no other flicker to the picture.
https://youtu.be/Z8dK6gRylg4
As for troubleshooting, at this point I visually checked the caps and they seem fine. I also fully disconnected the T-CON board and the lines don't appear. Just a black screen with a glow around the edges.
The previous owner said it was the main board that was bad, but I'm not sure how he arrived at that conclusion. It feels like I'm dealing with 2 separate issues, but I'm not experienced enough to know for sure. I'd rather not just start swapping out parts willy nilly and I'm guessing there are some other ways to diagnose things to get a better target. Any help would be greatly appreciated.
Thanks!
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