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Samsung UN50JU6500FXZA TV has one vertical line black on right side open tv up and re seated all cables and ribbons . Do i need a new t-con or is it lcd

@jsherbaugh going by your description it sounds like a TAB (TCP) error, which will make it a LCD issue. A single one colored line can be caused by a bad LCD driver IC, TCP package torn and controller IC. Try to press on the top screen location where the vertical line is located. If that pressure gets rid of the vertical line, you will have a bad Tape Carrier Package (TCP). There is really no fix to it other than replace the LCD. Sometimes adding some pressure to the TCP either through cloth tape or other means can temporarily eliminate that line. It might help if you post an image of what you see with your question. For that use this guide