Hello,Thanks for the question. My name is Dan.
Is the line solid or can you see through it?
Does it appear on all inputs? Cable box, DVD player, etc.?
You said it will change colors... what color(s) is it?Regards,Dan
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Samsung uses many, many different panels with their sets... the Tcon you require is dependent on which one you have. You'll need to get the part number from the board itself to be sure. When you have it, there are a few reputable places online where you should be able to get it... ShopJimmy.com and PartStore.com are a couple good ones.
If I remember your model correctly, when you remove the back panel from your TV there will be a board (maybe covered by a metal shield, maybe not)... it will be in the center (left to right) up toward the top of the panel, with a ribbon cable connected. This is the Tcon... the cable is the LVDS. Before you go ordering anything, disconnect and reconnect the cable just to be sure that wasn't your issue (minimal chance). If that doesn't fix it, get the whole part number (version, serial... every number you can find), then order it from one of the sites I linked you to earlier.