Oled tv has a vertical line approx 3 inches wide

@craig84 that sure looks like your TV developed a driver COF tab error. That line comes from a loss of contact between the source driver COF and the LCD panel. The COF is connected to the source driver board (long, skinny circuit board) and the LCD. Sometimes a bit of pressure on the COF right on the area where the line appears, may re-established contact. Sometimes wedging a piece of material between the COF and the display housing, can (temporarily) "fix" this. We'd have to see the location of that specific COF and what it looks like in relation to the LCD housing.